Track upstream fix for QXL auto resolution bug

phabricator-migrator · February 19, 2024, 5:46pm

Information

ID: 495
PHID: PHID-TASK-dsrps3a37tlxrmjyhe46
Author: HulaHoop
Status at Migration Time: resolved
Priority at Migration Time: Normal

Description

No upstream response to bug report: [Spice-devel] Bug: Automatic Guest Resolution Adjustment not functional with GRsec guests

Feature proposal:

Running “xrandr --output Virtual-0 --auto” always readjusts resolution to match window size.

Automating this command as a systemd unit (or something else?) that runs in the background every couple of seconds to compensate for the broken auto-resize feature should be good enough.

Comments

HulaHoop

2016-04-11 21:54:16 UTC

Tried making timer for the service with these settings as shown: http://jason.the-graham.com/2013/03/06/how-to-use-systemd-timers

Status: Not working.
#auto-res-kvm.service

[Unit]
Description=Automatically adjusts screen resolution for QEMU-KVM guests running Grsecurity
ConditionVirtualization=kvm

[Service]
Type=simple
ExecStart=/usr/bin/xrandr --output Virtual-0 --auto
#auto-res-kvm.timer

[Unit]
Description=Runs auto-res-kvm.service every 3 seconds

[Timer]
# Time between running each consecutive time
OnUnitActiveSec=3
Unit=auto-res-kvm.service
After=auto-res-kvm.service

[Install]
WantedBy=multi-user.target
Tips from working with systemd before:

https://phabricator.whonix.org/T144
https://github.com/Whonix/shared-folder-help/
systemd.timer

Patrick

2016-04-12 01:40:30 UTC

HulaHoop

2016-04-13 14:01:38 UTC

You’re right. I opened it here:

94920 – Automatic Guest Resolution Adjustment not functional with Grsec guests

Another idea is to have a simple bash script running this command at 5 second intervals in an infinite loop. Then have this script started at boot with a simple service file.

nohup (no hangup. Used by daemons. Works even if user logs out):
infinite loop - How to run infinitely script in background on Linux? - Stack Overflow

watch runs command repeatedly, displaying its output (the first screenfull). This allows you to watch the program output change over time. By default, the program is run every 2 seconds; use -n or --interval to specify a different interval.

watch will run until interrupted.

linux - Continuously re-execute a command when it finishes in Bash - Super User

Patrick

2016-04-13 15:25:26 UTC

HulaHoop

2016-04-16 03:16:30 UTC

HulaHoop

2016-04-29 03:08:40 UTC

HulaHoop

2016-10-10 15:28:40 UTC

HulaHoop

2016-10-11 13:30:55 UTC

I tried registering on https://bugs.kde.org/ to create a bug report but it seems to be blocking anonymous users from creating accounts. Patrick can you please open an account and post it on my behalf?

Ticket I wanted to post:

Automatic VM display resolution broken under KDE hosts

This is easy to reproduce. Running any VM guest on a KDE host will prevent it from automatically adjusting its resoltuion to fit the virt-viewer screen.

Related bug reports and suggested solution:

Not able to adjust display resolution in KVM and late password prompt during login - #4 by suk

1383425 – QXL driver does not automatically adjust resolution on kernels past 3.16

The solution is to implement handling of the monitor hotplug event in the window manager of KDE, like GNOME did in mutter and gnome-settings-daemon