Re: Some 7.1-post fixes that might be worth picking up rather sooner than later

On 7/7/26 17:19, Deucher, Alexander wrote:
>> -----Original Message-----
>> From: Thorsten Leemhuis <[email protected]>
>> Sent: Tuesday, July 7, 2026 6:19 AM
>> To: Greg KH <[email protected]>
>> Cc: Sasha Levin <[email protected]>; Linux kernel regressions list
>> <[email protected]>; [email protected]; Deucher, Alexander
>> <[email protected]>; Koenig, Christian
>> <[email protected]>; Dave Airlie <[email protected]>; Simona
>> Vetter <[email protected]>; Linus Torvalds <[email protected]>
>> Subject: Re: Some 7.1-post fixes that might be worth picking up rather sooner
>> than later
>>
>> [CCing a few people]
>>
>> On 6/22/26 07:32, Greg KH wrote:
>>> On Fri, Jun 19, 2026 at 11:43:41AM +0200, Greg KH wrote:
>>>> On Fri, Jun 19, 2026 at 08:04:35AM +0200, Thorsten Leemhuis wrote:
>>>>> Hi Stable Team! From the regressions point I think it might be nice
>>>>> to pick up the following changes for the next round of stable updates (e.g.
>>>>> 7.1.2), as they seem to fix regressions I've seen multiple people
>>>>> report with 7.1:
>>>>> [...]
>>>>> * 12f58a6caad3be ("drm/amd/display: Fix Color Manager (3DLUT,
>>>>> Shaper,
>>>>> Blend)") [v7.1-post]
>>>
>>> This doesn't apply to 7.1.y, and would need a working backport.
>> Just a quick status update twimc:
>>
>> I pointed that out in
>> https://gitlab.freedesktop.org/drm/amd/-/work_items/5396 , but nothing
>> happened from the AMD side afaics. They have much on their plate, I fully
>> understand that, I guess it fell through the cracks (maybe this mail helps).
>> Thing is: the backport of the revert is quite big, so nobody else (including me)
>> did yet dare to submit it themselves.
> 
> I've put a backport on the ticket.  Just waiting for verification from the affected users.

Great, many thx!

>> So two weeks later the regression caused by e56e3cff2a1bb2
>> ("drm/amd/display: Sync dcn42 with DC 3.2.373") [v7.1-rc1] is still unfixed in
>> 7.1.y as far as I can see it -- a regression that is known since more than two
>> months now, as the revert to fix it (12f58a6caad3be, mentioned in the quote
>> above) was submitted already on 2026-04-29, but only made it to mainline
>> during the merge window for 7.2 (this is another thing that afaics fell through
>> the cracks; sadly I only became aware of the regression after 7.1 was out,
>> otherwise I would have made noise earlier to get it included in 7.1).
>>
>> This all seems rather unfortunate.
>>
>> Luckily is seems the KDE Plasma developer turned off support for the color
>> pipeline stuff in Kwin 6.7.1
>> (https://invent.kde.org/plasma/kwin/-
>> /commit/9079a417b821f80c0d9e3bc5014a388e0e340f82
>> ), which apparently avoids the problem for many users (see the
>> gitlab.freedesktop ticket linked earlier).
>>
>> Ciao, Thorsten