Re: [REGRESSION] Please revert 1191285ecb42 from 7.1.y

[CCing a few people and lists]

/me just wanted to send a revert request himself, but then saw that
there was one to join in

On 8/11/26 04:29, Greg KH wrote:
> On Mon, Aug 10, 2026 at 03:17:43PM +0200, Sergio Callegari wrote:
>> after having looked a bit more thoroughly into the matter, and having gone
>> through the relevant commits that introduced and subsequently modified the
>> AMD backlight brightness code paths, I would like to suggest reverting
>> commit
>>
>> 1191285ecb4233e5bf907da7e9394d7999055566

For the record, that is f1b5d8f9cc54ae ("drm/amd/display: Fix backlight
max_brightness to match exported range") [v7.2-rc4, v7.1.6
(1191285ecb4233), v6.18.42 (490ceacd2162de)]

And yes, 6.18.y seems affected, too, according to a comment in the
ticket linked below.

>> from the 7.1 stable series.
> 
> It needs to be reverted in Linus's tree first, otherwise the regression
> will be hit when you update to 7.2.
Normally I'd agree, but according to one reporter that problem does not
happen with 7.2-rc:
https://gitlab.freedesktop.org/drm/amd/-/work_items/5562#note_3603131

So it seems it's some missing backport or something like that. But it
seems nobody yet has mentioned which other change(s) might be be
missing, unless I missed it (which is quite possible).

Quite a few people are affected, as can be seen by all the duplicated
Alex marked for the ticket linked above.

Given all that I wonder if dropping that commit for now might be the
best move.

Ciao, Thorsten