On Fri, Jun 20, 2025 at 7:35 PM Jeffrey Walton <noloa...@gmail.com> wrote:
> Hi Everyone, > > I'm working on Ubuntu 22.04.5, amd64, fully patched. It provides QEMU > 1:6.2+dfsg-2ubuntu6.26 and libvirt 8.0.0-1ubuntu7.11. > > The problem I am experiencing is, when the host machine blanks the > monitor, I lose the display on the guest when I sit back down at the > computer and wake the monitor. The error message (?) in the guest > window is, "Display output is not active." The condition happens with > both VIRTIO and VGA models. Also see <https://imgur.com/a/tEp73k2>. > > I have not found a workaround to stop it from happening or recover > after it happens. I have to Force Off the VM and then restart the VM > to the display back. > > My host power configuration is: disable sleep, suspend, hibernate and > hybrid-sleep via systemd's systemctl. However, I allow the monitor to > be turned off after 15 minutes of inactivity. My guest power > configuration is whatever the distro provides. > > Based on my searching, others have experienced the problem. And one > fellow says switching to the VGA model fixed it for him. (But no joy > for me). > > Does anyone have any suggestions for a work around Ugh, an important data point... The two machines experiencing "Display output is not active" are KDE Plasma machines. I just learned that a Debian/LXDE virtual machine does not have the problem. On the LXDE machine, the display goes inactive, but it comes back to life (wakes? activates?) when the mouse is moved. So it looks like a KDE specific issue. Jeff
