Re: kernel panic when resuming from hibernate in next-20260406 with PREEMPT_RT

[Ostrowski, Rafal]

Hi Bert,

I identified root cause of problem. I had to do modifications to mentioned patches to work well with PREEMPT_RT enabled. I tested it on my local machine and it seems to fix the problem. Now it has to go through internal processes. I will let you know if I know when fix will be available to you.

Kind Regards,
Rafal Ostrowski


> I was able to reproduce problem locally on Ubuntu 6.19.0+ #64 SMP PREEMPT_RT
>
> Tomorrow I will do my best to fix it. I will let you know by the end of day tomorrow about my progress.
>
> Kind Regards,
> Rafal Ostrowski
>
>Am Donnerstag, dem 09.04.2026 um 13:30 +0000 schrieb Ostrowski, Rafal:
>
>
>
> [AMD Official Use Only - AMD Internal Distribution Only]
>
> Hi Bert,
>
>
> Sorry that you experience this issue.
>
>
> Do you have all these 3 patches?:
> "drm/amd/display: Move FPU Guards From DML To DC - Part 1"
> "drm/amd/display: Move FPU Guards From DML To DC - Part 2"
> "drm/amd/display: Move FPU Guards From DML To DC - Part 3"
>
>
> These are highly dependent on each other.
>
>
> Kind Regards,
> Rafal
>

The crashes also occur when all three patches are applied.

Bert Karwatzki