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Bug#1112627: marked as done (linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE)

Your message dated Thu, 20 Nov 2025 13:15:58 +0100
with message-id <aR8Gfmi5ZvkcS0T9@eldamar.lan>
and subject line Re: Bug#1112627: linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE
has caused the Debian Bug report #1112627,
regarding linux-image-6.16.3+deb14-amd64: Intel audio no longer works: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] ... non-zero reserved fields in PTE
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
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misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
1112627: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1112627
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: src:linux
Version: 6.16.3-1
Severity: important
X-Debbugs-Cc: debian-amd64@lists.debian.org, invernomuto@paranoici.org
User: debian-amd64@lists.debian.org
Usertags: amd64

Hello!

I've just upgraded linux-image-amd64 and rebooted to
linux-image-6.16.3+deb14-amd64, to find a very bad surprise:
Intel integrated audio (device 00:1b.0, see the PCI list) no longer works.

Everything looks normal: alsamixer shows the usual controls (nothing relevant
was found to be accidentally muted) for the usual sound card (HDA Intel PCH);
jackd starts as usual; audacious starts as usual and plays music as usual.

But...

But nothing can be heard from the speakers and /var/log/kern.log is
filled with the following error messages (that repeat once every 5 s):

kernel: dmar_fault: 19382 callbacks suppressed
kernel: DMAR: DRHD: handling fault status reg 3
kernel: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] fault addr 0xffa02000 [fault reason 0x0c] non-zero reserved fields in PTE
kernel: DMAR: DRHD: handling fault status reg 3
kernel: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] fault addr 0xffa02000 [fault reason 0x0c] non-zero reserved fields in PTE
kernel: DMAR: DRHD: handling fault status reg 3
kernel: DMAR: [DMA Write NO_PASID] Request device [00:1b.0] fault addr 0xffa02000 [fault reason 0x0c] non-zero reserved fields in PTE
kernel: DMAR: DRHD: handling fault status reg 3


Rebooting with linux-image-6.12.38+deb13-amd64 makes everything work
again.

The error messages look similar to the ones quoted in a comment to
one [upstream bug] report, however that comment refers to Linux kernel
version 6.12.23, while I only see this issue after upgrading from
version 6.12.38 to version 6.16.3 ...

[upstream bug]: <https://bugzilla.kernel.org/show_bug.cgi?id=215919#c6>


What am I doing wrong?
Please forward my bug report upstream and incorporate a fix as soon as
possible.

Thanks for any help you may provide!


-- Package-specific info:
** Version:
Linux version 6.16.3+deb14-amd64 (debian-kernel@lists.debian.org) (x86_64-linux-gnu-gcc-14 (Debian 14.3.0-5) 14.3.0, GNU ld (GNU Binutils for Debian) 2.45) #1 SMP PREEMPT_DYNAMIC Debian 6.16.3-1 (2025-08-24)

** Command line:
BOOT_IMAGE=/boot/vmlinuz-6.16.3+deb14-amd64 root=UUID=a5d36947-d90d-4818-9184-7cda88ade7fd ro quiet

** Not tainted

** Kernel log:
Unable to read kernel log; any relevant messages should be attached

** Model information
sys_vendor: To Be Filled By O.E.M.
product_name: To Be Filled By O.E.M.
product_version: To Be Filled By O.E.M.
chassis_vendor: To Be Filled By O.E.M.
chassis_version: To Be Filled By O.E.M.
bios_vendor: American Megatrends Inc.
bios_version: P1.60
board_vendor: ASRock
board_name: Z97 Extreme6
board_version: 

** Configuration for modprobe:
blacklist arkfb
blacklist aty128fb
blacklist atyfb
blacklist radeonfb
blacklist cirrusfb
blacklist cyber2000fb
blacklist kyrofb
blacklist matroxfb_base
blacklist mb862xxfb
blacklist neofb
blacklist pm2fb
blacklist pm3fb
blacklist s3fb
blacklist savagefb
blacklist sisfb
blacklist tdfxfb
blacklist tridentfb
blacklist vt8623fb
blacklist microcode
options snd_pcsp index=-2
options cx88_alsa index=-2
options snd_atiixp_modem index=-2
options snd_intel8x0m index=-2
options snd_via82xx_modem index=-2
options md_mod start_ro=1
options bonding max_bonds=0
options dummy numdummies=0
options ifb numifbs=0

** Loaded modules:
cpufreq_conservative
msr
nls_ascii
nls_cp437
vfat
fat
binfmt_misc
intel_rapl_msr
intel_rapl_common
x86_pkg_temp_thermal
intel_powerclamp
coretemp
kvm_intel
snd_hda_codec_hdmi
kvm
irqbypass
ghash_clmulni_intel
snd_hda_codec_realtek
sha512_ssse3
snd_hda_codec_generic
sha1_ssse3
uvcvideo
snd_hda_scodec_component
aesni_intel
videobuf2_vmalloc
uvc
rapl
videobuf2_memops
mei_hdcp
mei_pxp
snd_hda_intel
at24
mxm_wmi
videobuf2_v4l2
intel_cstate
videodev
i915
intel_uncore
videobuf2_common
pcspkr
snd_intel_dspcfg
snd_soc_rt5640
snd_usb_audio
snd_soc_rl6231
snd_intel_sdw_acpi
snd_hda_codec
snd_usbmidi_lib
snd_soc_core
snd_rawmidi
mei_me
snd_seq_device
mc
snd_hda_core
mei
snd_compress
snd_pcm_dmaengine
snd_hwdep
drm_buddy
snd_pcm
ttm
snd_timer
drm_display_helper
snd
cec
rc_core
drm_client_lib
evdev
drm_kms_helper
acpi_pad
soundcore
button
i2c_algo_bit
sg
drm
nct6775
nct6775_core
configfs
hwmon_vid
efi_pstore
nfnetlink
ip_tables
x_tables
autofs4
ext4
crc16
mbcache
jbd2
crc32c_cryptoapi
btrfs
blake2b_generic
raid10
raid456
async_raid6_recov
async_memcpy
async_pq
async_xor
async_tx
xor
raid6_pq
raid0
raid1
hid_generic
usbhid
hid
uas
usb_storage
md_mod
sr_mod
sd_mod
cdrom
iTCO_wdt
intel_pmc_bxt
iTCO_vendor_support
watchdog
r8169
ahci
xhci_pci
libahci
libata
xhci_hcd
realtek
ehci_pci
mdio_devres
ehci_hcd
video
scsi_mod
libphy
usbcore
mdio_bus
e1000e
i2c_i801
wmi
scsi_common
lpc_ich
i2c_smbus
usb_common
efivarfs

** PCI devices:
00:00.0 Host bridge [0600]: Intel Corporation 4th Gen Core Processor DRAM Controller [8086:0c00] (rev 06)
	Subsystem: ASRock Incorporation Device [1849:0c00]
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ >SERR- <PERR- INTx-
	Latency: 0
	IOMMU group: 1
	Capabilities: <access denied>
	Kernel driver in use: hsw_uncore

00:02.0 VGA compatible controller [0300]: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller [8086:0412] (rev 06) (prog-if 00 [VGA controller])
	Subsystem: ASRock Incorporation Device [1849:0412]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 50
	IOMMU group: 0
	Region 0: Memory at ef400000 (64-bit, non-prefetchable) [size=4M]
	Region 2: Memory at d0000000 (64-bit, prefetchable) [size=256M]
	Region 4: I/O ports at f000 [size=64]
	Expansion ROM at 000c0000 [virtual] [disabled] [size=128K]
	Capabilities: <access denied>
	Kernel driver in use: i915
	Kernel modules: i915

00:03.0 Audio device [0403]: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller [8086:0c0c] (rev 06)
	Subsystem: ASRock Incorporation Device [1849:0c0c]
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 52
	IOMMU group: 2
	Region 0: Memory at efc34000 (64-bit, non-prefetchable) [size=16K]
	Capabilities: <access denied>
	Kernel driver in use: snd_hda_intel
	Kernel modules: snd_hda_intel

00:14.0 USB controller [0c03]: Intel Corporation 9 Series Chipset Family USB xHCI Controller [8086:8cb1] (prog-if 30 [XHCI])
	Subsystem: ASRock Incorporation Device [1849:8cb1]
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 35
	IOMMU group: 3
	Region 0: Memory at efc20000 (64-bit, non-prefetchable) [size=64K]
	Capabilities: <access denied>
	Kernel driver in use: xhci_hcd
	Kernel modules: xhci_pci

00:16.0 Communication controller [0780]: Intel Corporation 9 Series Chipset Family ME Interface #1 [8086:8cba]
	Subsystem: ASRock Incorporation Device [1849:8cba]
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 49
	IOMMU group: 4
	Region 0: Memory at efc3e000 (64-bit, non-prefetchable) [size=16]
	Capabilities: <access denied>
	Kernel driver in use: mei_me
	Kernel modules: mei_me

00:19.0 Ethernet controller [0200]: Intel Corporation Ethernet Connection (2) I218-V [8086:15a1]
	Subsystem: ASRock Incorporation Device [1849:15a1]
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 34
	IOMMU group: 5
	Region 0: Memory at efc00000 (32-bit, non-prefetchable) [size=128K]
	Region 1: Memory at efc3c000 (32-bit, non-prefetchable) [size=4K]
	Region 2: I/O ports at f080 [disabled] [size=32]
	Capabilities: <access denied>
	Kernel driver in use: e1000e
	Kernel modules: e1000e

00:1a.0 USB controller [0c03]: Intel Corporation 9 Series Chipset Family USB EHCI Controller #2 [8086:8cad] (prog-if 20 [EHCI])
	Subsystem: ASRock Incorporation Device [1849:8cad]
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 16
	IOMMU group: 6
	Region 0: Memory at efc3b000 (32-bit, non-prefetchable) [size=1K]
	Capabilities: <access denied>
	Kernel driver in use: ehci-pci
	Kernel modules: ehci_pci

00:1b.0 Audio device [0403]: Intel Corporation 9 Series Chipset Family HD Audio Controller [8086:8ca0]
	Subsystem: ASRock Incorporation Device [1849:1151]
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 51
	IOMMU group: 7
	Region 0: Memory at efc30000 (64-bit, non-prefetchable) [size=16K]
	Capabilities: <access denied>
	Kernel driver in use: snd_hda_intel
	Kernel modules: snd_hda_intel

00:1c.0 PCI bridge [0604]: Intel Corporation 9 Series Chipset Family PCI Express Root Port 1 [8086:8c90] (rev d0) (prog-if 00 [Normal decode])
	Subsystem: ASRock Incorporation Device [1849:8c90]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 26
	IOMMU group: 8
	Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
	I/O behind bridge: [disabled] [16-bit]
	Memory behind bridge: [disabled] [32-bit]
	Prefetchable memory behind bridge: [disabled] [64-bit]
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR+ NoISA- VGA- VGA16+ MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: <access denied>
	Kernel driver in use: pcieport

00:1c.2 PCI bridge [0604]: Intel Corporation 9 Series Chipset Family PCI Express Root Port 3 [8086:8c94] (rev d0) (prog-if 00 [Normal decode])
	Subsystem: ASRock Incorporation Device [1849:8c94]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin C routed to IRQ 27
	IOMMU group: 9
	Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
	I/O behind bridge: e000-efff [size=4K] [16-bit]
	Memory behind bridge: efb00000-efbfffff [size=1M] [32-bit]
	Prefetchable memory behind bridge: e0000000-e00fffff [size=1M] [32-bit]
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR+ NoISA- VGA- VGA16+ MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: <access denied>
	Kernel driver in use: pcieport

00:1c.3 PCI bridge [0604]: Intel Corporation 9 Series Chipset Family PCI Express Root Port 4 [8086:8c96] (rev d0) (prog-if 00 [Normal decode])
	Subsystem: ASRock Incorporation Device [1849:8c96]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin D routed to IRQ 28
	IOMMU group: 10
	Bus: primary=00, secondary=03, subordinate=08, sec-latency=0
	I/O behind bridge: c000-dfff [size=8K] [16-bit]
	Memory behind bridge: ef800000-ef9fffff [size=2M] [32-bit]
	Prefetchable memory behind bridge: [disabled] [64-bit]
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR+ NoISA- VGA- VGA16+ MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: <access denied>
	Kernel driver in use: pcieport

00:1c.6 PCI bridge [0604]: Intel Corporation 9 Series Chipset Family PCI Express Root Port 7 [8086:8c9c] (rev d0) (prog-if 00 [Normal decode])
	Subsystem: ASRock Incorporation Device [1849:8c9c]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin C routed to IRQ 29
	IOMMU group: 11
	Bus: primary=00, secondary=09, subordinate=09, sec-latency=0
	I/O behind bridge: [disabled] [16-bit]
	Memory behind bridge: efa00000-efafffff [size=1M] [32-bit]
	Prefetchable memory behind bridge: [disabled] [64-bit]
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR+ NoISA- VGA- VGA16+ MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: <access denied>
	Kernel driver in use: pcieport

00:1d.0 USB controller [0c03]: Intel Corporation 9 Series Chipset Family USB EHCI Controller #1 [8086:8ca6] (prog-if 20 [EHCI])
	Subsystem: ASRock Incorporation Device [1849:8ca6]
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin A routed to IRQ 23
	IOMMU group: 12
	Region 0: Memory at efc3a000 (32-bit, non-prefetchable) [size=1K]
	Capabilities: <access denied>
	Kernel driver in use: ehci-pci
	Kernel modules: ehci_pci

00:1f.0 ISA bridge [0601]: Intel Corporation Z97 Chipset LPC Controller [8086:8cc4]
	Subsystem: ASRock Incorporation Device [1849:8cc4]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	IOMMU group: 13
	Capabilities: <access denied>
	Kernel driver in use: lpc_ich
	Kernel modules: lpc_ich

00:1f.2 SATA controller [0106]: Intel Corporation 9 Series Chipset Family SATA Controller [AHCI Mode] [8086:8c82] (prog-if 01 [AHCI 1.0])
	Subsystem: ASRock Incorporation Device [1849:8c82]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0
	Interrupt: pin B routed to IRQ 40
	IOMMU group: 13
	Region 0: I/O ports at f0d0 [size=8]
	Region 1: I/O ports at f0c0 [size=4]
	Region 2: I/O ports at f0b0 [size=8]
	Region 3: I/O ports at f0a0 [size=4]
	Region 4: I/O ports at f060 [size=32]
	Region 5: Memory at efc39000 (32-bit, non-prefetchable) [size=2K]
	Capabilities: <access denied>
	Kernel driver in use: ahci
	Kernel modules: ahci

00:1f.3 SMBus [0c05]: Intel Corporation 9 Series Chipset Family SMBus Controller [8086:8ca2]
	Subsystem: ASRock Incorporation Device [1849:8ca2]
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Interrupt: pin C routed to IRQ 18
	IOMMU group: 13
	Region 0: Memory at efc38000 (64-bit, non-prefetchable) [size=256]
	Region 4: I/O ports at f040 [size=32]
	Kernel driver in use: i801_smbus
	Kernel modules: i2c_i801

02:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8211/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 11)
	Subsystem: ASRock Incorporation Motherboard (one of many) [1849:8168]
	Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Interrupt: pin A routed to IRQ 18
	IOMMU group: 14
	Region 0: I/O ports at e000 [size=256]
	Region 2: Memory at efb00000 (64-bit, non-prefetchable) [size=4K]
	Region 4: Memory at e0000000 (64-bit, prefetchable) [size=16K]
	Capabilities: <access denied>
	Kernel driver in use: r8169
	Kernel modules: r8169

03:00.0 PCI bridge [0604]: ASMedia Technology Inc. ASM1184e 4-Port PCIe x1 Gen2 Packet Switch [1b21:1184] (prog-if 00 [Normal decode])
	Subsystem: ASRock Incorporation ASM1184e 4-Port PCIe x1 Gen2 Packet Switch [1849:1184]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 19
	IOMMU group: 15
	Bus: primary=03, secondary=04, subordinate=08, sec-latency=0
	I/O behind bridge: c000-dfff [size=8K] [16-bit]
	Memory behind bridge: ef800000-ef9fffff [size=2M] [32-bit]
	Prefetchable memory behind bridge: [disabled] [64-bit]
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR+ NoISA- VGA- VGA16+ MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: <access denied>
	Kernel driver in use: pcieport

04:01.0 PCI bridge [0604]: ASMedia Technology Inc. ASM1184e 4-Port PCIe x1 Gen2 Packet Switch [1b21:1184] (prog-if 00 [Normal decode])
	Subsystem: ASRock Incorporation ASM1184e 4-Port PCIe x1 Gen2 Packet Switch [1849:1184]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 30
	IOMMU group: 16
	Bus: primary=04, secondary=05, subordinate=05, sec-latency=0
	I/O behind bridge: [disabled] [32-bit]
	Memory behind bridge: [disabled] [32-bit]
	Prefetchable memory behind bridge: [disabled] [64-bit]
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR+ NoISA- VGA- VGA16+ MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: <access denied>
	Kernel driver in use: pcieport

04:03.0 PCI bridge [0604]: ASMedia Technology Inc. ASM1184e 4-Port PCIe x1 Gen2 Packet Switch [1b21:1184] (prog-if 00 [Normal decode])
	Subsystem: ASRock Incorporation ASM1184e 4-Port PCIe x1 Gen2 Packet Switch [1849:1184]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 31
	IOMMU group: 17
	Bus: primary=04, secondary=06, subordinate=06, sec-latency=0
	I/O behind bridge: d000-dfff [size=4K] [16-bit]
	Memory behind bridge: ef900000-ef9fffff [size=1M] [32-bit]
	Prefetchable memory behind bridge: [disabled] [64-bit]
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR+ NoISA- VGA- VGA16+ MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: <access denied>
	Kernel driver in use: pcieport

04:05.0 PCI bridge [0604]: ASMedia Technology Inc. ASM1184e 4-Port PCIe x1 Gen2 Packet Switch [1b21:1184] (prog-if 00 [Normal decode])
	Subsystem: ASRock Incorporation ASM1184e 4-Port PCIe x1 Gen2 Packet Switch [1849:1184]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 32
	IOMMU group: 18
	Bus: primary=04, secondary=07, subordinate=07, sec-latency=0
	I/O behind bridge: [disabled] [32-bit]
	Memory behind bridge: [disabled] [32-bit]
	Prefetchable memory behind bridge: [disabled] [64-bit]
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR+ NoISA- VGA- VGA16+ MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: <access denied>
	Kernel driver in use: pcieport

04:07.0 PCI bridge [0604]: ASMedia Technology Inc. ASM1184e 4-Port PCIe x1 Gen2 Packet Switch [1b21:1184] (prog-if 00 [Normal decode])
	Subsystem: ASRock Incorporation ASM1184e 4-Port PCIe x1 Gen2 Packet Switch [1849:1184]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 33
	IOMMU group: 19
	Bus: primary=04, secondary=08, subordinate=08, sec-latency=0
	I/O behind bridge: c000-cfff [size=4K] [16-bit]
	Memory behind bridge: ef800000-ef8fffff [size=1M] [32-bit]
	Prefetchable memory behind bridge: [disabled] [64-bit]
	Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
	BridgeCtl: Parity- SERR+ NoISA- VGA- VGA16+ MAbort- >Reset- FastB2B-
		PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
	Capabilities: <access denied>
	Kernel driver in use: pcieport

06:00.0 SATA controller [0106]: ASMedia Technology Inc. ASM1061/ASM1062 Serial ATA Controller [1b21:0612] (rev 02) (prog-if 01 [AHCI 1.0])
	Subsystem: ASRock Incorporation Motherboard [1849:0612]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 42
	IOMMU group: 17
	Region 0: I/O ports at d050 [size=8]
	Region 1: I/O ports at d040 [size=4]
	Region 2: I/O ports at d030 [size=8]
	Region 3: I/O ports at d020 [size=4]
	Region 4: I/O ports at d000 [size=32]
	Region 5: Memory at ef900000 (32-bit, non-prefetchable) [size=512]
	Capabilities: <access denied>
	Kernel driver in use: ahci
	Kernel modules: ahci

08:00.0 SATA controller [0106]: ASMedia Technology Inc. ASM1061/ASM1062 Serial ATA Controller [1b21:0612] (rev 02) (prog-if 01 [AHCI 1.0])
	Subsystem: ASRock Incorporation Motherboard [1849:0612]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 43
	IOMMU group: 19
	Region 0: I/O ports at c050 [size=8]
	Region 1: I/O ports at c040 [size=4]
	Region 2: I/O ports at c030 [size=8]
	Region 3: I/O ports at c020 [size=4]
	Region 4: I/O ports at c000 [size=32]
	Region 5: Memory at ef800000 (32-bit, non-prefetchable) [size=512]
	Capabilities: <access denied>
	Kernel driver in use: ahci
	Kernel modules: ahci

09:00.0 USB controller [0c03]: ASMedia Technology Inc. ASM1042A USB 3.0 Host Controller [1b21:1142] (prog-if 30 [XHCI])
	Subsystem: ASRock Incorporation Device [1849:1142]
	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 0, Cache Line Size: 64 bytes
	Interrupt: pin A routed to IRQ 18
	IOMMU group: 20
	Region 0: Memory at efa00000 (64-bit, non-prefetchable) [size=32K]
	Capabilities: <access denied>
	Kernel driver in use: xhci_hcd
	Kernel modules: xhci_pci


** USB devices:
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8009 Intel Corp. 
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 002: ID 8087:8001 Intel Corp. Integrated Hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 002: ID 174c:2074 ASMedia Technology Inc. ASM1074 High-Speed hub
Bus 003 Device 003: ID 1235:8211 Focusrite-Novation Scarlett Solo (3rd Gen.)
Bus 003 Device 004: ID 046d:c077 Logitech, Inc. Mouse
Bus 003 Device 005: ID 046d:c313 Logitech, Inc. Internet 350 Keyboard
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 004 Device 002: ID 174c:3074 ASMedia Technology Inc. ASM1074 SuperSpeed hub
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 002: ID 18d1:0002 Google Inc. HD USB Camera
Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub


-- System Information:
Debian Release: forky/sid
  APT prefers testing
  APT policy: (800, 'testing'), (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.16.3+deb14-amd64 (SMP w/4 CPU threads; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages linux-image-6.16.3+deb14-amd64 depends on:
ii  initramfs-tools [linux-initramfs-tool]  0.148.3
ii  kmod                                    34.2-2
ii  linux-base                              4.14

Versions of packages linux-image-6.16.3+deb14-amd64 recommends:
ii  apparmor  4.1.0-1

Versions of packages linux-image-6.16.3+deb14-amd64 suggests:
pn  debian-kernel-handbook  <none>
ii  extlinux                3:6.04~git20190206.bf6db5b4+dfsg1-3.2
ii  firmware-linux-free     20241210-2
ii  grub-efi-amd64          2.12-9
pn  linux-doc-6.16          <none>

Versions of packages linux-image-6.16.3+deb14-amd64 is related to:
pn  firmware-amd-graphics      <none>
pn  firmware-atheros           <none>
pn  firmware-bnx2              <none>
pn  firmware-bnx2x             <none>
pn  firmware-brcm80211         <none>
pn  firmware-cavium            <none>
pn  firmware-cirrus            <none>
ii  firmware-intel-graphics    20250808-1
pn  firmware-intel-misc        <none>
pn  firmware-intel-sound       <none>
pn  firmware-ipw2x00           <none>
pn  firmware-ivtv              <none>
pn  firmware-iwlwifi           <none>
pn  firmware-libertas          <none>
pn  firmware-marvell-prestera  <none>
pn  firmware-mediatek          <none>
pn  firmware-misc-nonfree      <none>
pn  firmware-myricom           <none>
pn  firmware-netronome         <none>
pn  firmware-netxen            <none>
pn  firmware-nvidia-graphics   <none>
pn  firmware-qcom-soc          <none>
pn  firmware-qlogic            <none>
pn  firmware-realtek           <none>
pn  firmware-samsung           <none>
pn  firmware-siano             <none>
pn  firmware-ti-connectivity   <none>
pn  xen-hypervisor             <none>

-- no debconf information

--- End Message ---
--- Begin Message --- 
Francesco,

On Sun, Nov 16, 2025 at 05:43:05PM +0100, Salvatore Bonaccorso wrote:
> Hi,
> 
> On Wed, Nov 12, 2025 at 10:44:00PM +0100, Francesco Poli wrote:
> > On Tue, 11 Nov 2025 13:44:23 +0100 Salvatore Bonaccorso wrote:
> > 
> > [...]
> > > On Wed, Nov 05, 2025 at 11:52:55PM +0100, Francesco Poli wrote:
> > [...]
> > > >  * if I enable VT-d, audio fails to work
> > > > 
> > > >  * if I disable VT-d, audio works correctly
> > [...]
> > > > Now I have some questions:
> > > > 
> > > >  - is disabling VT-d in the BIOS settings equivalent to booting with
> > > >    intel_iommu=off kernel parameter?
> > > 
> > > Yes, this result is equivalent.
> > 
> > OK, good to know.
> > 
> > > 
> > > >  - I thought that enabling VT-d was needed for QEMU in KVM mode, but I
> > > >    cannot verify it (starting 'kvm' seems to work, without any visible
> > > >    complaint): could you please tell me what I am missing, by disabling
> > > >    VT-d?
> > > 
> > > It depends on which use cases you have for the VMs. Do you need to
> > > passh through hardware?
> > 
> > Things like GPU pass-through?
> > Do I understand correctly that it requires at least two GPUs in the
> > box?
> > I only have the graphics integrated in the Intel CPU, hence, if GPU
> > pass-through indeed requires two GPUs, I am not going to need GPU
> > pass-through anytime soon... Probably I'll never use it on this box...
> > 
> > Is there any other relevant pass-through thing, besides GPU
> > pass-through? 
> > 
> > > Do you use nested virtualization?
> > 
> > VMs running within the VM which is running on the bare metal?
> > I have never used it. I don't know whether I will need it in the
> > future, but I guess I won't. At least, not in the short/medium term...
> > 
> > > 
> > > >  - does this additional information help in understanding the issue
> > > >    and, perhaps, in fixing it?
> > > 
> > > That is still the harder part :(.
> > 
> > I can imagine!   :-p
> > 
> > > We will have another meeting on
> > > wednesday and this bug will likely (unless we run out of time) be on
> > > the agenda/table again.
> > 
> > Thanks a lot, this is really appreciated.
> > 
> > > 
> > > We see more IOMMU related failures recently (when old HW is involved),
> > > so this might indeed be the way forward, tbh. But we will see tomorrow
> > > is someone has other input on the topic.
> > 
> > OK, looking forward to receiving further feedback.
> > 
> > As always, thank you so much for your kind assistance!   :-)
> 
> I keep the answer short after we discussed it as promissed.
> 
> You can pass in as well other PCI devices for instance, say maybe pass
> a USB controller in, or a NIC. But really if you never used that for
> your usecase, our proposal is now to just keep IOMMU disabled (either
> via BIOS setting, or via kernel command line parameter) and consider
> this (even not solved in the most optimal way) "done".

And we agreed in yesterday's meeting since we have a workaround here,
and no further ideas to move on and close the bug, which I'm doing
now.

Regards,
Salvatore

--- End Message ---
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