ACPI Error - LCD Screen "resets"

[megavolt]

Hello @Jack1221

@Jack1221

[ 1477.402218] ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PCI0.PEG0.PEGP.BRT6.LCD], AE_NOT_FOUND (20200925/psargs-330)

This error says in general that the ACPI driver attempted to evaluate (execute) the ACPI brightness control method for the screen but this failed because the ACPI AML byte code in your firmware did not have the object _SB.PCI0.PEG0.PEGP.BRT6.LCD defined for some reason.

It is in general a BIOS/UEFI bug/error.

An upgrade to a newer version for your UEFI could help, but also telling the UEFI/BIOS that your are running Windows, to get the correct response for the brightness control:

@FadeMind

ACPI - for the modern models of laptops with UEFI (2011 year production or newer) please adding after acpi_osi=Linux :

acpi_osi='!Windows 2012'

ACPI - for the modern models of laptops with UEFI (2014 year production or newer) please using:

This workaround is dedicated for Intel Skylike Laptops with NVIDIA Optimus freezes issue. See: Bumblebee GH-764 :

acpi_osi=! acpi_osi="Windows 2009"

or

acpi_osi=! acpi_osi='Windows 2015'

On some laptops, when Fn keys or display backlight Fn keys does not works at all use blank acpi_osi value:

acpi_osi=

@Jack1221

I am not used to rolling release distros, so maybe errors like this are more common than I would imagine?

No not really, ACPI Errors are always hardware related and have nothing to do with the RR Distros.