https://bugzilla.kernel.org/show_bug.cgi?id=81021

--- Comment #4 from LiNuxXer andre.d@gmx.net --- (In reply to Alex Deucher from comment #2)

You can enable it by setting pi->enable_bapm = true; in trinity_dpm_init() in trinity_dpm.c. Unforunately, it's not stable yet on all systems.

Thank you for this hint, Alex.

A search does not reveal much. Do you have a reference to the problems which this can cause?

trinity_dpm.c seems to be a file of the free radeon driver. Actually, I would prefer to go without any HW specific graphics driver.

I was hoping for a slight chance for the kernel to detect this annoyance and solve it (in a first step) regardless of any later graphics driver settings.