Bug#976389: libqt5quick5-gles: With libqt5quick5-gles KDE icons & widgets don't appear, with libqt5quick5 it works
Package: libqt5quick5-gles
Version: 5.15.1+dfsg-2
Severity: normal
When I had a system running with libqt5quick5-gles the display was horribly messed up with missing
icons and KDE window controls. I could work around it by setting
MESA_EXTENSION_OVERRIDE=”-GL_EXT_bgra -GL_EXT_texture_format_BGRA8888″ in the environment for the
user (which didn't affect SDDM which still had mangled display).
When I ran "apt remove libqt5quick5-gles" (which installed libqt5quick5) and rebooted (I could have
just restarted sddm but wanted to get the new kernel) it worked without setting any environment
variables.
Using the MESA_EXTENSION_OVERRIDE variable broke Warzone2100 (for reasons I have not figured out),
but using libqt5quick5 KDE and Warzone2100 both work perfectly.
https://etbe.coker.com.au/2020/12/04/kde-icons-disappearing-unstable/
I wrote a blog post about this which has some more details.
https://inductive-kickback.com/2017/02/mystery-black-window-workaround-druid-back-in-development/
The above blog post has the most technical detail about this including some test Qt code.
In what situations does libqt5quick5-gles work better than libqt5quick5?
-- System Information:
Debian Release: bullseye/sid
APT prefers unstable
APT policy: (700, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 5.9.0-4-amd64 (SMP w/4 CPU threads)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8), LANGUAGE=en_AU:en
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: SELinux: enabled - Mode: Permissive - Policy name: default
Versions of packages libqt5quick5-gles depends on:
ii libc6 2.31-5
ii libqt5core5a [qtbase-abi-5-15-1] 5.15.1+dfsg-4
ii libqt5gui5 5.15.1+dfsg-4
ii libqt5network5 5.15.1+dfsg-4
ii libqt5qml5 [qtdeclarative-abi-5-15-1] 5.15.1+dfsg-3
ii libqt5qmlmodels5 5.15.1+dfsg-3
ii libstdc++6 10.2.0-19
libqt5quick5-gles recommends no packages.
libqt5quick5-gles suggests no packages.
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