Bug#1101546: installation-reports: Wifi is no longer detected in Debain after I started windows 100 dual boot, until reinstalled the bios. Applies also to debain installer

[Pascal Hambourg <pascal@plouf.fr.eu.org>]

On 29/03/2025 at 23:23, Michael Josenhans wrote:
> Here are attached the requested additional logs.

Sorry for the late answer. This definitely looks like a kernel bug and I 
doubt it can be fixed at the Debian installer level. The Debian kernel 
team may have more clue and you may consider reassigning the bug to 
src:linux.

A quick search with the error messages reports a few possible workarounds:

- Disable Intel AMT (Active Management Technology)

- Disable Windows "fast startup" (hybrid shutdown)

- Disable "fast boot" in BIOS/UEFI settings (not to be confused with 
Windows "fast startup")

- Disable BIOS/UEFI settings related to "PCIe Power Saving mode" or 
"PCIe ASPM" (Active State Power Management)'.

- Disable BIOS/UEFI Wake-on-LAN

- Power off, remove power cord (and/or battery), hold power button for 
30 seconds, then boot.

- Unload + reload kernel module iwlwifi (and iwlmvm if needed)

- echo 1 > "/sys/bus/pci/devices/0000:3a:0.0/reset" (adjust with the 
actual PCI bus ID, and maybe unload and reload iwlwifi)

- Add pcie_aspm=off to the kernel command line

- Add acpi_osi=! acpi_osi="Windows 2022" to the kernel command line

- Add a file /etc/modprobe.d/iwlwifi.conf with the following lines:
options iwlwifi bt_coex_active=0
options iwlwifi power_save=0
options iwlwifi uapsd_disable=1
options iwlmvm power_scheme=1

- boot with an older kernel (4.19 from buster, 5.10 from bullseye); it 
will not fix the issue but may indicate a possible regression