Public bug reported: In focal release of Ubuntu proper (GNOME Desktop) i was going trought the release on livestream using KVM based VM(libvirtd and virt-manager using default video settings provided by virt-manager, Host is ubuntu mate 20.04) and one of the things i was trying to show was fractional scaling which made my X11 session unusable. Screen turned black. Tryed different settings in Virt-manager for Video non worked. Resolved the issue by switching to wayland session within which fractional scaling worked and i could disable it/switch to 100%. When i after that switched to X11 session scaling was back to normal.
SideNote: when switching scaling in a VM i was running resolution was reseting back to normal. https://youtu.be/0EFEGafZXDE?t=3400 link to the recording of a livestream on youtube with timecode enabled. (Video name: checking out Ubuntu 20.04 LTS, Channel: bigpod, timecode: 56:40) Edit: Additinal information, Can confirm this happening on stock ubuntu installed on my system on top of ubuntu mate 20.04 . Setting selected 150% 1920x1080 resolution. additionaly it appears that it only affects single monitor setups becasue this didnt happen on dual monitor system until i set gnome to mirror on both displays. ** Affects: gnome-shell (Ubuntu) Importance: Undecided Status: New ** Tags: focal -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1876508 Title: Fractional scaling crashes X11 session in KVM based virtual machines Status in gnome-shell package in Ubuntu: New Bug description: In focal release of Ubuntu proper (GNOME Desktop) i was going trought the release on livestream using KVM based VM(libvirtd and virt-manager using default video settings provided by virt-manager, Host is ubuntu mate 20.04) and one of the things i was trying to show was fractional scaling which made my X11 session unusable. Screen turned black. Tryed different settings in Virt-manager for Video non worked. Resolved the issue by switching to wayland session within which fractional scaling worked and i could disable it/switch to 100%. When i after that switched to X11 session scaling was back to normal. SideNote: when switching scaling in a VM i was running resolution was reseting back to normal. https://youtu.be/0EFEGafZXDE?t=3400 link to the recording of a livestream on youtube with timecode enabled. (Video name: checking out Ubuntu 20.04 LTS, Channel: bigpod, timecode: 56:40) Edit: Additinal information, Can confirm this happening on stock ubuntu installed on my system on top of ubuntu mate 20.04 . Setting selected 150% 1920x1080 resolution. additionaly it appears that it only affects single monitor setups becasue this didnt happen on dual monitor system until i set gnome to mirror on both displays. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1876508/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
