Pascal Hambourg recommended me to do the following to check if the following things impact the wlan activation: >- Disable Intel AMT (Active Management Technology)
MJ: Disabled in Bios: No impact. Reenabled in Bios again. >- Disable Windows "fast startup" (hybrid shutdown) MJ: Do not know what this is. >- Disable "fast boot" in BIOS/UEFI settings (not to be confused with Windows "fast startup") MJ: Disabled "Startup delay Fast Boot" in Bios: No impact. Reenabled in Bios again. >- Disable BIOS/UEFI settings related to "PCIe Power Saving mode" or "PCIe ASPM" (Active State Power Management)'. MJ: Do not know what this is. >- Disable BIOS/UEFI Wake-on-LAN MJ: Already disabled >- Power off, remove power cord (and/or battery), hold power button for 30 seconds, then boot. MJ: This HP Elitebook is a Laptop with build-in battery. Can not remove the battery. Thus removed the power cord and did not remove the battery. Result: WLAN is working on debian bookworm as expected. When starting Windows 11 I have to enter the windows bitlocker key (maybe not because of pressing the power button, but because of disabiling Intel AMT (Active Management Technology) and reeabling it again). After reentering the bitlocker key, windows 11 works correctly with WLAN (as before). When restarting debian again, WLAN is still working. For now for me the issue is solved, but the reason is unclear. No need to do the following further tests: >- 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 Does it make sense to do any further investigation?
