possible bug with RDNA4 and AMS

[Malte Schröder]

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.

Versions are kernel 6.15-rc2 + drm-fixes-6.15, libdrm is from git
(2.4.124 fdf384d4), mesa is 25.1-rc and kwin is 6.3.4.

I am happy to provide debug, but I need some guidance to it.


Regards

Malte