Bug#914203: Checked pattern appears on X clients

[Stéphane Glondu]

Package: xwayland
Version: 2:1.20.3-1
Severity: important

Dear Maintainers,

Under a GNOME session with Wayland, a checked pattern appears on X
clients when calling the "View split on left/right" feature
(Super+Left/Right)... not always, but usually after a few back and
forth. Attached is a screenshot showing the problem with Firefox, but
I see the problem also with emacs, wish, xterm, gitk, git-gui... the
pattern doesn't always cover the whole window, but it seems the title
bar is always affected.

I cannot reproduce when using the "GNOME with X11" session.

Cheers,
--
Stéphane

-- System Information:
Debian Release: buster/sid
APT prefers testing
APT policy: (990, 'testing'), (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 4.18.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8), LANGUAGE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages xwayland depends on:
ii libaudit1 1:2.8.4-2
ii libbsd0 0.9.1-1
ii libc6 2.27-8
ii libdrm2 2.4.95-1
ii libegl1 1.1.0-1
ii libepoxy0 1.5.3-0.1
ii libgbm1 18.1.9-1
ii libgcrypt20 1.8.4-3
ii libgl1 1.1.0-1
ii libpixman-1-0 0.34.0-2
ii libselinux1 2.8-1+b1
ii libsystemd0 239-11
ii libunwind8 1.2.1-8
ii libwayland-client0 1.16.0-1
ii libxau6 1:1.0.8-1+b2
ii libxdmcp6 1:1.1.2-3
ii libxfont2 1:2.0.3-1
ii libxshmfence1 1.3-1
ii xserver-common 2:1.20.3-1

xwayland recommends no packages.

xwayland suggests no packages.

-- no debconf information

[Michel Dänzer]

Post by Stéphane Glondu
Package: xwayland
Version: 2:1.20.3-1
Severity: important
Dear Maintainers,
Under a GNOME session with Wayland, a checked pattern appears on X
clients when calling the "View split on left/right" feature
(Super+Left/Right)... not always, but usually after a few back and
forth. Attached is a screenshot showing the problem with Firefox, but
I see the problem also with emacs, wish, xterm, gitk, git-gui... the
pattern doesn't always cover the whole window, but it seems the title
bar is always affected.
From the screenshot, it looks more likely to be a driver issue than an

Xwayland one.

Please provide the corresponding output of glxinfo.

[Stéphane Glondu]

Post by Stéphane Glondu
From the screenshot, it looks more likely to be a driver issue than an
Xwayland one.
Please provide the corresponding output of glxinfo.

I've attached the output of glxinfo under Xorg, and under Wayland.

Cheers,