https://bugs.kde.org/show_bug.cgi?id=448297
Bug ID: 448297
Summary: Screen isn't cleared on suspend resulting in leaked
image on resume
Product: kwin
Version: 5.23.5
Platform: Debian testing
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: core
Assignee: kwin-bugs-n...@kde.org
Reporter: shtetl...@gmail.com
Target Milestone: ---
Since recent Plasma update, when suspending and resuming the session, there is
a brief image of screen during resume that's showing what was on screen prior
to suspend. Which essentially leaks some information about the previous session
before lock-screen appears on resume. It looks like the screen buffer isn't
filled with zeroes (or black rectangle) before suspend happens and that's
coming back on screen before the lock.
This happens both in Wayland and X11 session. Tested both with initiating
suspend from Application Dashboard and from terminal with systemctl suspend.
OS: Debian testing (Linux kernel 5.16.0).
GPU: Sapphire Pulse RX 6800 XT.
Mesa: 21.3.3
Systemd: 249.7
Not fully sure if it's a KWin bug or not, but filing under KWin component for
now.
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