Comment # 3
on bug 100289
from Michel Dänzer
(In reply to OmegaPhil from comment #2) > confirmed 7.9 is loaded, the problem is still present. Does radeon_scanout_flip still spit out both "Invalid argument" and "Device or resource busy" errors? > Hmm, so XFCE4 Display could be responsible for blacking out the other > monitors momentarily too? Yes, that could be a side effect of XFCE changing the virtual desktop resolution. All of this could be triggered by the DisplayPort connection appearing disconnected while the monitor is off, which I understand can happen at least with some monitors.
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