** Changed in: linux (Ubuntu Focal)
Status: Triaged => Fix Committed
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https://bugs.launchpad.net/bugs/1892010
Title:
[SRU] Fix acpi backlight issue on some thinkpads
Status in HWE Next:
New
Status in linux package in Ubuntu:
Triaged
Status in linux-oem-5.6 package in Ubuntu:
Invalid
Status in linux source package in Focal:
Fix Committed
Status in linux-oem-5.6 source package in Focal:
Triaged
Status in linux source package in Groovy:
Triaged
Bug description:
[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.
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