i use Qubes OS System and Kernel 4.14.103 works fine, but when i try to use any newer Kernel, the login to Desktop failed.
there are also some artifacts at lightdm login, please look at the atttachment.
i also tried a manually compiled kernel, but the result is almost the same.
in Xorg.0.log there's the Error - this happens only with newer Kernels:
[ 62.958] (EE) glamor0: GL error: GL_OUT_OF_MEMORY in glTexSubImage
[ 62.958] (WW) glamor: Failed to allocate 22x22 FBO due to GL_OUT_OF_MEMORY.
[ 62.958] (WW) glamor: Expect reduced performance.
i also tried the current Version of amdgpu Driver- non Pro!
the only difference to the 4.14 Kernel is the Module >> gpu-sched >> which is only loaded with newer Kernels, e.g 5.0.2.
Is this a Xen Problem or a Driver Problem in context with Xen+newer Kernels?
The Card on FunToo Linux works perfect, no Problems at all.