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

[Aaron Ma]

On 8/19/20 4:44 PM, Stefan Bader wrote:
> 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.

Added Groovy and Focal targets in bug.

It should be for Focal,Focal/oem-5.6.

Thanks,
Aaron

> 
>>
>> [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(-)
>>
> 
>