I have <graphics type='spice'> <listen type='socket' socket='/tmp/foo'/> </graphics> set for one of my VMs, and virsh domdisplay tells me error :No graphical display found I'd expect to get something like spice+unix:///tmp/foo in this case. The same error is reported with listen type='none' but I'm not sure if something could be reported in this case (No graphical display is not correct though, so error message might need improving).
Haha sorry I ialready filed that a long time ago and forgot :) *** This bug has been marked as a duplicate of bug 1336720 ***