All of the kernels I have tried from kernel-default-5.8.0-1.1 through 5.8.10-1.2 display the same behavior. I am currently running kernel-default-5.7.12-1.1.g9c98feb with no issues thus far. So... it seems to be something introduced in 5.8.0 You said "it'd be best to report to upstream bug tracker". Where should I do that?