Hi, I've been trying to get a dvm to open media files in mplayer in a 
disposable qube.
Starting the disposable media qube from dom0 with qvm-run --dispvm media-dvm 
--service -- qubes.StartApp+st works.
Copying files(same as the ones used to test qvm-open-in-vm/qvm-open-in-dvm) to 
the vm with qvm-copy works.
Opening the copied files with xdg-open or qubes-open works in the dvm.
Opening media files in mplayer in the disposable qube with qvm-open-in-dvm used 
to work. 
It stopped working after I switched the media qube's template from 
debian-11-minimal to debian-12-minimal.
I used qubesctl with state.highstate to get the new template to be in the same 
state as the previous template.
I checked journalctl -f in the media dvm while running qvm-open-in-vm from the 
vm that usually calls qvm-open-in-dvm.
The media dvm consistently gives the same errors:
May 01 10:04:54 disp7040 systemctl[914]: Failed to connect to bus: No medium 
found
May 01 10:04:56 disp7040 qubes.OpenInVM+-browse-disp[925]: cat: write error: 
Bad file descriptor
May 01 10:04:56 disp7040 qubes.OpenInVM+-browse-disp[925]: 
May 01 10:04:56 disp7040 qubes.OpenInVM+-browse-disp[925]: 
May 01 10:04:56 disp7040 qubes.OpenInVM+-browse-disp[925]: MPlayer interrupted 
by signal 13 in module: unknown
This is was using a mplayer binary I built myself.
If I use remove that and let it use a version from apt I get a sligthly 
different set of errors:
May 01 10:26:46 disp7040 systemctl[1234]: Failed to connect to bus: No medium 
found
May 01 10:26:48 disp7040 qubes.OpenInVM+-browse-disp[1246]: cat: write error: 
Bad file descriptor
May 01 10:26:48 disp7040 qubes.OpenInVM+-browse-disp[1246]: do_connect: could 
not connect to socket
May 01 10:26:48 disp7040 qubes.OpenInVM+-browse-disp[1246]: connect: No such 
file or directory
May 01 10:26:48 disp7040 qubes.OpenInVM+-browse-disp[1246]: Failed to open LIRC 
support. You will not be able to use your remote control.
May 01 10:26:48 disp7040 qubes.OpenInVM+-browse-disp[1246]: 
May 01 10:26:48 disp7040 qubes.OpenInVM+-browse-disp[1246]: 
May 01 10:26:48 disp7040 qubes.OpenInVM+-browse-disp[1246]: MPlayer interrupted 
by signal 13 in module: unknown
The vm that calls qvm-open-in-dvm can successfully open media files in other 
vms.
Thanks in advance for any ideas you might have.

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