Mouse events only in limited area after connecting display.

[honzahosek]

Qubes OS release

4.1

Brief summary

This happens only sometimes.
After connecting HDMI display (of bigger resolution) windows running in some appvm (debian-11, firefox) adjust to the resolution, but are getting mouse events only in top-left part limited by some smaller resolution.
Described also here:
#7309 (comment)

Connecting and disconnecting HDMI several times does not help. Restarting appvm helps.

Completion criteria checklist

• Detect when problem happens - either by checking the size of new displays vs configured max ram, or by getting some info from gui-agent (or Xorg driver inside VM?) that it failed to allocate memory for the new display; Maybe qubes.SetMonitorLayout service can detect such situation?
• Display notification that setting needs to be adjusted for the new monitor to work in VMs
• offer setting it automatically?
• inform the user that qubes needs to be restarted for the new setting to apply

Stretch goal:

• check if videoram setting (in VM) can be changed dynamically without restart

[logoerthiner1]

https://www.qubes-os.org/doc/gui-troubleshooting/

This might be useful.

[honzahosek]

https://www.qubes-os.org/doc/gui-troubleshooting/

This might be useful.

It seems like it is it. In that case this will be more and more common problem. There should be at least something what triggers some warning telling people what to do.