https://bugs.freedesktop.org/show_bug.cgi?id=96868

--- Comment #15 from Andy Furniss adf.lists@gmail.com --- (In reply to Jonas from comment #14)

I get the same behaviour here with my XFX R9 390, latest Arch Linux and amdgpu driver. Forcing "high" power profile makes it work, but it also raises the temps (and probably power draw) too much to my liking.

If we could only up the vram frequency but not the core, maybe it would be a more acceptable situation of temps/features.

You should be able to do this eg. on my R9 285

echo manual > /sys/class/drm/card0/device/power_dpm_force_performance_level

cat /sys/class/drm/card0/device/pp_dpm_mclk 0: 150Mhz * 1: 1375Mhz

echo 1 > /sys/class/drm/card0/device/pp_dpm_mclk

cat /sys/class/drm/card0/device/pp_dpm_mclk 0: 150Mhz 1: 1375Mhz *

Though it will undo if you change modes or go into DPMS.