possible bug with RDNA4 and AMS

[Malte Schröder]

On 22/04/2025 17:28, Michel Dänzer wrote:
> On 2025-04-20 21:38, Malte Schröder wrote:
>> Hi,
>>
>> finally found this list, I hope it's the right place for this. I
>> recently swapped my trusty RX 6900 XT with a shiny new RX 9070 XT (aka
>> RDNA2 to 4). Now, when I start kwin_wayland my desktop is a flickering
>> mess. As a workaround I can set KWIN_DRM_NO_AMS, it is working with
>> this. Afaik this disables the use of atomic mode setting. So I guess
>> there is a bug in either amdgpu kernel side, libdrm or mesa.
> FWIW, if it's a user-space issue, it's most likely in kwin. Mesa doesn't use KMS directly in this scenario, and libdrm is just a thin wrapper around KMS ioctls.
>
I only encountered this issue after upgrading my GPU. My config has been
running fine with the Navi21 GPU.


Anyways, I found there is already an open ticket:

https://gitlab.freedesktop.org/drm/amd/-/issues/4057

I also was hitting https://gitlab.freedesktop.org/drm/amd/-/issues/4144.


Strange that I didn't manage to find these. My search engine foo must
have been weak...


Regards

Malte