https://bugs.freedesktop.org/show_bug.cgi?id=107793
--- Comment #9 from 8zST4a7dHsqbqXeQ@tuta.io --- Just to add - Same happens to me with an R9 380 graphics card since amdgpu.dc was enabled. I am using my monitor through the vga port (with an dvi to vga adapter on my gpu). Passing "amdgpu.dc=0" also resolves the problem for me. Is there any debug that I should provide that may help?