https://bugs.freedesktop.org/show_bug.cgi?id=76490
--- Comment #41 from Alex Deucher alexdeucher@gmail.com --- (In reply to Tobias Droste from comment #40)
Do you think it's a problem with the kernel code or with the firmware? Does windows use the same firmware for DPM?
I think it's probably a driver bug. Windows and Linux use the same ucode.