[PATCH 0/1][SRU][F/OEM-5.6/Groovy] Fix acpi backlight issue on some thinkpads

[Stefan Bader]

On 18.08.20 11:49, Aaron Ma wrote:
> BugLink: https://bugs.launchpad.net/bugs/1892010

The bug report has no tasks other than Groovy and the subject is ambigous on
whether you mean Focal/oem-5.6 or Focal,Focal/oem-5.6.

> 
> [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.
> 
> Aaron Ma (1):
>   platform/x86: thinkpad_acpi: not loading brightness_init when _BCL
>     invalid
> 
>  drivers/platform/x86/thinkpad_acpi.c | 7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 


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