Re: How to recover from "Display output is not active"

On Tue, Jun 24, 2025 at 9:10 AM Martin Kletzander <mkletzan(a)redhat.com&gt; wrote: > > On Mon, Jun 23, 2025 at 05:31:46AM -0400, Jeffrey Walton wrote: > >On Fri, Jun 20, 2025 at 7:35 PM Jeffrey Walton <noloader(a)gmail.com&gt; wrote: > >> > >> 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). > > When this happens to me, I literally just move the mouse, press a key, > basically just send some HW input to the guest. The only time that did > not work was when the resolution was automatically changed to something > not working. But that was with virt-viewer/virt-manager. Yeah, that does not work for me. > >Here is the post where the person says VGA fixed it for him: > ><https://www.tarball.ca/posts/cockpit-kvm-display-output-is-not-active/>. > >But again, no joy for me. > > > > What sticks out in the link above is that it is in cockpit. Could it be > cockpit's fault? Can you try reproducing it without cockpit, with just > virt-viewer for example? My bad, I am using virt-manager. I'd like to try to tweak the BIOS on the VM, but I don't see it listed in virt-manager for the VM. How do I get to the BIOS settings? (On real hardware, I usually disable S3/S45/S5 sleep states in the BIOS or UEFI, and let Systemd handle power management).

Jeff