[drm] Fence fallback timer expired on ring gfx_0.0.0 (on FreeBSD)

[yurivict]

I use the drm-612-kmod driver on FreeBSD 15.1-STABLE in order to use the embedded AMD GPU on the Tomahawk 870 motherboard to run Xorg.

CPU is AMD Ryzen 9 9950X 16-Core.

drm-612-kmod begins to print the following errors and becomes almost frozen.

The source code is taken from this project: amdgpu.

[drm] Fence fallback timer expired on ring gfx_0.0.0
[drm] Fence fallback timer expired on ring sdma0
[drm] Fence fallback timer expired on ring gfx_0.0.0
[drm] Fence fallback timer expired on ring gfx_0.0.0
[drm] Fence fallback timer expired on ring gfx_0.0.0
[drm] Fence fallback timer expired on ring gfx_0.0.0
[drm] Fence fallback timer expired on ring gfx_0.0.0
[drm] Fence fallback timer expired on ring gfx_0.0.0
[drm] Fence fallback timer expired on ring gfx_0.0.0