Comment # 21
on bug 104064
from taijian@posteo.de
Now testing the same build, but with amdgpu.dc=0 amdgpu.force_atpx=1. Here the system does not crash on repeated invocations of the dGPU (via DRI_PRIME=1 glxinfo), but it also does not fully power down, as confirmed by powertop (26-28 W power consumption, vs ~12W with dc=1 and the dGPU not in use). So the option to force atpx apparently does nothing without dc. Is that intended? (Sorry, I don't speak C, so I really cannot tell...)
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