Comment # 14 on bug 106447 from john-s-84@gmx.net

Same Problem here (HP zbook 15u 5g).

https://bugzilla.kernel.org/show_bug.cgi?id=199609

Chen Yu recommended to write a request on amd-gfx@lists.freedesktop.org with no
success so far.

https://lists.freedesktop.org/archives/amd-gfx/2018-May/022064.html