https://bugs.freedesktop.org/show_bug.cgi?id=76130
--- Comment #23 from mirh mirh@protonmail.ch --- (In reply to Thaddaeus Tintenfisch from comment #22)
I was able to resolve the FPS drop by running the following two commands:
echo battery > /sys/class/drm/card0/device/power_dpm_state echo balanced > /sys/class/drm/card0/device/power_dpm_state
In this case, I guess this now becomes bug 66963