This bug was fixed in the package qtmir - 0.8.0~git20260226.fb30a11-4
---------------
qtmir (0.8.0~git20260226.fb30a11-4) unstable; urgency=medium
* debian/patches:
+ Add 0035_surfacemanager-windowmodel-guard-against-null-
GLRenderingProvider.patch. surfacemanager, windowmodel: guard against
null GLRenderingProvider.
+ Add 0036_mirsurface-show-X11-override-redirect-windows-when-ready.patch.
Fix Xwayland subsurface rendering, so that X11 widgets that use override-
redirect (GTK combo boxes, menus, etc.) get rendered properly in Mir.
Thanks for Marius Gripsgard for provding the patch.
-- Mike Gabriel <[email protected]> Sun, 17 May 2026 14:27:55 +0200
** Description changed:
- .
+ Drop-down menus don't show for xwayland apps in Lomiri. You can still
+ open menu items with the keyboard if you know how many down arrow
+ presses you need before pressing enter.
+
+ Test Case
+ ---------
+ If you are using GNOME Boxes, virt-manager or qemu, you need to enable 3D
Acceleration. See https://wiki.debian.org/Lomiri
+
+ 1. From Ubuntu Desktop 26.04 LTS,
+ sudo apt install lomiri gtk-3-examples
+ When asked to choose between gdm3 and lightdm, it's ok to choose gdm
+ 2. Log out.
+ 3. Click your name on the login screen. Click the gear button and select
Lomiri. Enter your password to finish logging in.
+ 4. You may need to hold the Windows key to show the sidebar and app launcher
the first time you log in.
+ 5. Open a terminal and run
+ GDK_BACKEND_X11 gtk3-demo
+ ````
+
+ Run any of the demos. Verify that drop down menus work correctly.
+
+ Affected apps
+ -------------
+ - Google Chrome and Chromium still use xwayland by default
+ - Several apps that try to run the entire gui with elevated privileges appear
to use xwayland and are affected. Synaptic (.deb package manager), gparted,
calamares
+ - Most other apps using gtk3, gtk4, qt 5, or qt 6 aren't affected by default
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: qtmir 0.8.0~git20260226.fb30a11-3
ProcVersionSignature: Ubuntu 7.0.0-15.15-generic 7.0.0
Uname: Linux 7.0.0-15-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: Lomiri
Date: Sun May 17 14:19:28 2026
InstallationDate: Installed on 2026-04-22 (25 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64
(20260420.1)
SourcePackage: qtmir
UpgradeStatus: No upgrade log present (probably fresh install)
** Changed in: qtmir (Ubuntu)
Status: Fix Committed => Fix Released
** Description changed:
- Drop-down menus don't show for xwayland apps in Lomiri. You can still
- open menu items with the keyboard if you know how many down arrow
- presses you need before pressing enter.
+ Drop-down menus (such as in the menu bar or in combo boxes) don't show
+ for xwayland apps in Lomiri. You can still open menu items with the
+ keyboard if you know how many down arrow presses you need before
+ pressing enter.
Test Case
---------
If you are using GNOME Boxes, virt-manager or qemu, you need to enable 3D
Acceleration. See https://wiki.debian.org/Lomiri
1. From Ubuntu Desktop 26.04 LTS,
sudo apt install lomiri gtk-3-examples
When asked to choose between gdm3 and lightdm, it's ok to choose gdm
2. Log out.
3. Click your name on the login screen. Click the gear button and select
Lomiri. Enter your password to finish logging in.
4. You may need to hold the Windows key to show the sidebar and app launcher
the first time you log in.
5. Open a terminal and run
GDK_BACKEND_X11 gtk3-demo
````
Run any of the demos. Verify that drop down menus work correctly.
Affected apps
-------------
- Google Chrome and Chromium still use xwayland by default
- Several apps that try to run the entire gui with elevated privileges appear
to use xwayland and are affected. Synaptic (.deb package manager), gparted,
calamares
- Most other apps using gtk3, gtk4, qt 5, or qt 6 aren't affected by default
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: qtmir 0.8.0~git20260226.fb30a11-3
ProcVersionSignature: Ubuntu 7.0.0-15.15-generic 7.0.0
Uname: Linux 7.0.0-15-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: Lomiri
Date: Sun May 17 14:19:28 2026
InstallationDate: Installed on 2026-04-22 (25 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64
(20260420.1)
SourcePackage: qtmir
UpgradeStatus: No upgrade log present (probably fresh install)
** Changed in: qtmir (Ubuntu Resolute)
Status: Triaged => In Progress
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https://bugs.launchpad.net/bugs/2152852
Title:
drop-down menus don't work for xwayland
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