It sounds like the most problematic apps are going through Xwayland. Actually I've seen similar issues with poor scaling of Xwayland apps and need to make some time to find out what the mechanism is that makes them scale correctly on Xorg but not on Xwayland...
In the meantime, Firefox should be fixable by adding a new line to /etc/environment: MOZ_ENABLE_WAYLAND=1 and then reboot. Chrome support is coming, but I've read isn't quite ready yet: https://www.phoronix.com/scan.php?page=news_item&px=Wayland-Chromium-2020 https://wiki.archlinux.org/index.php/chromium#Native_Wayland_support Although native Wayland support is all longer term. In the shorter term I wonder if we can fix Xwayland/mutter to communicate the correct scaling factor. ** Tags added: multimonitor ** Tags added: scaling ** Also affects: xorg-server (Ubuntu) Importance: Undecided Status: New ** Summary changed: - multiple monitors with mixed DPI not scaling correctly + Multiple monitors with mixed DPI not scaling Xwayland apps correctly ** Tags added: wayland -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1913681 Title: Multiple monitors with mixed DPI not scaling Xwayland apps correctly Status in mutter package in Ubuntu: New Status in xorg-server package in Ubuntu: New Bug description: I am running 3 monitors under wayland. 2x 1440p monitors at 1x scale (one of these is my primary display) 1x 4k laptop at 2x scale The majority apps seem to not get correct scaling on the 2x display. gnome-control-center is the one that seems to work correctly. Things like chrome, firefox and most other apps (which work fine when only using the single 4k) are all tiny on the laptop display. Its the same in reverse also, if I set the 4k screen as primary most windows (again except gnome-control-centre) are too large on the 1550p screens. ProblemType: Bug DistroRelease: Ubuntu 20.10 Package: mutter 3.38.2-1ubuntu1~20.10.1 ProcVersionSignature: Ubuntu 5.8.0-41.46-generic 5.8.18 Uname: Linux 5.8.0-41-generic x86_64 ApportVersion: 2.20.11-0ubuntu50.3 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: GNOME Date: Fri Jan 29 17:43:58 2021 InstallationDate: Installed on 2020-07-23 (190 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423) SourcePackage: mutter UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1913681/+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
