https://bugs.kde.org/show_bug.cgi?id=521946
Bug ID: 521946
Summary: Brightness slider applet disappears from system tray
after S3 resume, even though DDC/CI is functional
Classification: Plasma
Product: plasmashell
Version First 6.6.5
Reported In:
Platform: Bazzite
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: Brightness and Color widget
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: 1.0
After suspend-to-RAM (S3), the monitor brightness slider (the one that controls
DDC/CI brightness) disappears from the system tray. The system tray still shows
the brightness icon but the slider itself is no longer rendered/available. The
monitor still supports DDC/CI after resume — ddcutil getvcp 10 and ddcutil
setvcp 10 <value work correctly from the command line.
Before suspend: slider is present and adjusts brightness via DDC/CI.
After resume: slider is gone. Reboot restores it.
This suggests the brightness applet in plasma-workspace queries DDC/CI
capability on login but does not re-query it after resume from sleep. KScreen
may not emit a "capability changed" event on resume, so the applet hides itself
permanently.
Steps to reproduce
Connect a DDC/CI-capable monitor via DP (tested: P275MV PLUS)
Observe brightness slider in system tray (present)
suspend
Resume
Brightness slider is gone
ddcutil setvcp 10 50 still works (DDC/CI is live)
Workaround
Reboot
Log out and back in (likely also works)
similar bug but not the same: https://bugs.kde.org/show_bug.cgi?id=516066
SOFTWARE/OS VERSIONS
Operating System (available in the Info Center app, or by running `kinfo` in a
terminal window): Bazzite
KDE Plasma Version: 6.6.5
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