Created attachment 132664 [details] log_attaching_detaching The same hardware as for https://bugs.freedesktop.org/show_bug.cgi?id=101764 When the HDMI cable is connected there is no signal for the external monitor and the internal panel keeps working as expected. The journal when the cable is attached and then detached is attached to this ticket. What's interesting to me is: gdm-Xorg-:0[551]: (EE) NOUVEAU(G0): failed to set mode: No space left on device
Created attachment 132665 [details] log_full_attaching_detaching
Created attachment 132666 [details] xrand_before xrandr output before attaching the HDMI cable
Created attachment 132667 [details] xrandr_after xrandr output after attaching the HDMI cable
Apparently the problem is: (EE) NOUVEAU(G0): Error creating GPU channel: -19 (EE) NOUVEAU(G0): Error initialising acceleration. Falling back to NoAccel in our kernel we are booting with 'noaccel=1' that is disabling acceleration. But nouveau can't do the prime offload without accel since it uses the copy engine to copy the framebuffer out.
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