https://bugzilla.kernel.org/show_bug.cgi?id=195465
--- Comment #3 from Michel Dänzer (michel@daenzer.net) --- What exactly is the problem? The only suspicious thing in dmesg is the below, which indicates that the GPU's power management might not be working perfectly:
[ 20.346154] cant't get the mac of 5 [ 20.348337] [ powerplay ] VBIOS did not find boot engine clock value in dependency table. Using Memory DPM level 0!