This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:
apport-collect 1892010
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Tags added: groovy
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https://bugs.launchpad.net/bugs/1892010
Title:
[SRU][F/OEM-5.6/Groovy] Fix acpi backlight issue on some thinkpads
Status in HWE Next:
New
Status in linux package in Ubuntu:
Incomplete
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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