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Bug#1018760: marked as done (i915: "Failed to get the SoC PWM chip", unable to adjust backlight on x7-Z8750 / GPD Pocket 1)

Your message dated Mon, 8 Jan 2024 17:42:14 +0300
with message-id <20240108174214.5bdc5387@Tarkus>
and subject line Re: Bug#1018760: Acknowledgement (i915: "Failed to get the SoC PWM chip", unable to adjust backlight on x7-Z8750 / GPD Pocket 1)
has caused the Debian Bug report #1018760,
regarding i915: "Failed to get the SoC PWM chip", unable to adjust backlight on x7-Z8750 / GPD Pocket 1
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
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
1018760: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1018760
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: src:linux
Version: 5.10.136-1
Severity: normal
X-Debbugs-Cc: krylov.r00t@gmail.com

Dear Maintainer,

On my GPD Pocket 1, the backlight worked well with the 4.19 kernel from
stretch-backports. After the upgrade to Bullseye, I cannot adjust the
backlight intensity either using the keyboard shortcuts or by writing
into /sys/class/backlight/acpi_video0/brightness. In the latter case,
the write succeeds but doesn't have an effect on my display.

I can also see this problem with the 5.18 kernel from bullseye-backports.

The following lines from the kernel log seem to be relevant, but I'm
afraid I'm completely at a loss regarding what can be done to fix the
problem:

[  +0,009771] i915 0000:00:02.0: [drm] *ERROR* Failed to get the SoC PWM chip
[  +0,006728] [drm] Initialized i915 1.6.0 20201103 for 0000:00:02.0 on minor 0

I do have VirtualBox installed from Debian Fasttrack, which does taint
the kernel, but the problem has been present even before I installed the
package.

Please let me know if there's anything else I can do to help.

-- Package-specific info:
** Kernel log: boot messages should be attached

** Model information
sys_vendor: Default string
product_name: Default string
product_version: Default string
chassis_vendor: Default string
chassis_version: Default string
bios_vendor: American Megatrends Inc.
bios_version: 5.11
board_vendor: AMI Corporation
board_name: Default string
board_version: Default string

** PCI devices:
00:00.0 Host bridge [0600]: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series SoC Transaction Register [8086:2280] (rev 34)
	Subsystem: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series SoC Transaction Register [8086:7270]
	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
	Kernel driver in use: iosf_mbi_pci

00:02.0 VGA compatible controller [0300]: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Integrated Graphics Controller [8086:22b0] (rev 34) (prog-if 00 [VGA controller])
	DeviceName:  Onboard IGD
	Subsystem: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Integrated Graphics Controller [8086:7270]
	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 124
	Region 0: Memory at a0000000 (64-bit, non-prefetchable) [size=16M]
	Region 2: Memory at 80000000 (64-bit, prefetchable) [size=512M]
	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

00:0b.0 Signal processing controller [1180]: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series Power Management Controller [8086:22dc] (rev 34)
	Subsystem: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series Power Management Controller [8086:7270]
	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 133
	Region 0: Memory at a1a3b000 (64-bit, non-prefetchable) [size=4K]
	Capabilities: <access denied>
	Kernel driver in use: proc_thermal
	Kernel modules: processor_thermal_device_pci_legacy

00:14.0 USB controller [0c03]: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series USB xHCI Controller [8086:22b5] (rev 34) (prog-if 30 [XHCI])
	Subsystem: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series USB xHCI Controller [8086:7270]
	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 123
	Region 0: Memory at a1a00000 (64-bit, non-prefetchable) [size=64K]
	Capabilities: <access denied>
	Kernel driver in use: xhci_hcd
	Kernel modules: xhci_pci

00:1a.0 Encryption controller [1080]: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series Trusted Execution Engine [8086:2298] (rev 34)
	Subsystem: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series Trusted Execution Engine [8086:7270]
	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 131
	Region 0: Memory at a1900000 (32-bit, non-prefetchable) [size=1M]
	Region 1: Memory at a1800000 (32-bit, non-prefetchable) [size=1M]
	Capabilities: <access denied>
	Kernel driver in use: mei_txe
	Kernel modules: mei_txe

00:1c.0 PCI bridge [0604]: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series PCI Express Port #1 [8086:22c8] (rev 34) (prog-if 00 [Normal decode])
	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 117
	Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
	I/O behind bridge: [disabled]
	Memory behind bridge: a1000000-a14fffff [size=5M]
	Prefetchable memory behind bridge: [disabled]
	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

00:1f.0 ISA bridge [0601]: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series PCU [8086:229c] (rev 34)
	Subsystem: Intel Corporation Atom/Celeron/Pentium Processor x5-E8000/J3xxx/N3xxx Series PCU [8086:7270]
	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
	Capabilities: <access denied>
	Kernel driver in use: lpc_ich
	Kernel modules: lpc_ich

01:00.0 Network controller [0280]: Broadcom Inc. and subsidiaries BCM4356 802.11ac Wireless Network Adapter [14e4:43ec] (rev 02)
	Subsystem: Gemtek Technology Co., Ltd BCM4356 802.11ac Wireless Network Adapter [17f9:0036]
	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 136
	Region 0: Memory at a1400000 (64-bit, non-prefetchable) [size=32K]
	Region 2: Memory at a1000000 (64-bit, non-prefetchable) [size=4M]
	Capabilities: <access denied>
	Kernel driver in use: brcmfmac
	Kernel modules: brcmfmac


** USB devices:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 258a:0111 SINO WEALTH Gaming Keyboard
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub


-- System Information:
Debian Release: 11.4
  APT prefers stable-security
  APT policy: (500, 'stable-security'), (500, 'stable-debug'), (500, 'oldoldstable-debug'), (500, 'oldoldstable'), (500, 'stable'), (100, 'bullseye-fasttrack'), (100, 'bullseye-backports-staging')
Architecture: amd64 (x86_64)

Kernel: Linux 5.18.0-0.deb11.3-amd64 (SMP w/4 CPU threads; PREEMPT)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=ru_RU.UTF-8, LC_CTYPE=ru_RU.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages linux-image-5.10.0-17-amd64 depends on:
ii  initramfs-tools [linux-initramfs-tool]  0.140
ii  kmod                                    28-1
ii  linux-base                              4.6

Versions of packages linux-image-5.10.0-17-amd64 recommends:
ii  apparmor             2.13.6-10
ii  firmware-linux-free  20200122-1

Versions of packages linux-image-5.10.0-17-amd64 suggests:
pn  debian-kernel-handbook  <none>
ii  grub-efi-amd64          2.04-20
pn  linux-doc-5.10          <none>

Versions of packages linux-image-5.10.0-17-amd64 is related to:
pn  firmware-amd-graphics     <none>
pn  firmware-atheros          <none>
pn  firmware-bnx2             <none>
pn  firmware-bnx2x            <none>
ii  firmware-brcm80211        20210315-3
pn  firmware-cavium           <none>
ii  firmware-intel-sound      20210315-3
pn  firmware-intelwimax       <none>
pn  firmware-ipw2x00          <none>
pn  firmware-ivtv             <none>
pn  firmware-iwlwifi          <none>
pn  firmware-libertas         <none>
pn  firmware-linux-nonfree    <none>
ii  firmware-misc-nonfree     20210315-3
pn  firmware-myricom          <none>
pn  firmware-netxen           <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 --- 
Version: 5.10.136-1

My apologies for filing this bug by mistake. The problem turned out to
be with my setup, not the kernel version. The backlight works if the
module pwm-lpss-platform is loaded early (i.e. specified in
/etc/initramfs-tools/modules). Otherwise, I get a dim but working
backlight with 6.1.0-17 from Bookworm or no backlight at all after
certain point with 4.19 from Stretch-backports.

-- 
Best regards,
Ivan

--- End Message ---
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