Public bug reported:
When using GTK4 apps, touching a button using a touchscreen (commonly a
dropdown menu or hamburger menu) sometimes causes the button to be
highlighted slightly darker as if pressed, but then not do anything
(e.g. not open the relevant menu) and leave the button highlighted even
when the touch is removed.
When this happens, the app seems to ignore most other input, including
the mouse. It sometimes ignores clicking the X to close it, does not let
you click inside the application, etc. It still properly slightly
highlights things as the mouse hovers over them, but does not respond to
clicks. Touching elsewhere can sometimes remove or move the highlighting
effect, but will generally not. It is sometimes possible to partially
recover by for example clicking a different top tab in system monitor,
but this does not fully recover and the app still must be closed. In
some cases, it responds to a touch on the X (or use of "quit" in the
dock) to close it, but not a click on the X.
I believe GTK4 is the common thread. Present in ubuntu settings,
nautilus, clocks, the Gnome software store (the white one, not the
orange snap one), and system monitor, all of which show as using gtk4
with `apt-cache rdepends libgtk-4-1`.
Steps to reproduce:
Open settings. Navigate to display settings. Using a touchscreen, try to open a
dropdown menu. The menu will not open, and will stay highlighted. This is now
in the unusual state described. Clicking anywhere in the app, including the X,
will mostly not have an effect. The app will ignore some but not all touches.
System details:
Dell XPS 9365 2-in-1
Intel i7 7y75, 16gb RAM
Ubuntu 24.04, fresh installation.
** Affects: gtk4 (Ubuntu)
Importance: Undecided
Status: New
** Package changed: xserver-xorg-video-amdgpu (Ubuntu) => gtk4 (Ubuntu)
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https://bugs.launchpad.net/bugs/2072378
Title:
GTK4 apps "freezing"/not respecting inputs on touchscreen
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