Public bug reported:
[Impact]
On some ThinkPads, the BIOS reported invalid acpi backlight implement .
Then backlight can't be changed because OS use acpi backlight by default.
[Fix]
Check acpi backlight mode, disable it if invalid.
[Test Case]
Verified on 3 models of thinkpad include Intel/NV/AMD GPU with positive results.
[Regression Potential]
Low
Most ThinkPads now use native backlight control by default.
Check the false acpi mode correctly.
** Affects: hwe-next
Importance: Undecided
Status: New
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: oem-priority originate-from-1879867 sutton
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https://bugs.launchpad.net/bugs/1892010
Title:
[SRU][F/OEM-5.6/Groovy] Fix acpi backlight issue on some thinkpads
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