Issue or bug concerning DRRS on old i7-4980HQ

[Jani Nikula]

On Mon, 04 Aug 2025, René Herman <rene.herman at gmail.com> wrote:
> On 04-08-2025 17:42, Jani Nikula wrote:
>
>> On Mon, 04 Aug 2025, René Herman <rene.herman at gmail.com> wrote:
>
>> All I'm saying is that any fix must not depend on the user having to use
>> a debugfs or a module parameter. It needs to work out of the box.
>
> Makes sense to me. Now, while repeating me being clueless about this 
> code and even technology outright, I've wondered if the thing to do 
> might even just be refusing to enable/use DRRS on this old Haswell-era 
> hardware
>
> Probably not a theoretically/technically sound/interesting  plan -- but 
> it sure would solve things for both me/us and the Ubuntu/freedesktop.org 
> bug-reporter, and frankly, I don't think anyone on a system like that in 
> 2025 would know or care in the first place. They just very much mind the 
> flickering...
>
> Maybe stupid; maybe regresses a ton of Haswell-era systems on which it 
> does work fine. No idea...

There's been a bunch of updates on DRRS in the past year, and I have yet
to see a dmesg with debugs enabled reproducing the issue on a recent
kernel. We need data before doing anything else. The discussion in this
thread is not actionable. For all I know the issue could've been fixed
already.

BR,
Jani.

-- 
Jani Nikula, Intel