https://bugs.kde.org/show_bug.cgi?id=490623
Bug ID: 490623
Summary: [Wayland] DisplayPort monitor doesn't wake up if the
PC wakes up from suspend first
Classification: Plasma
Product: KScreen
Version: 5.27.11
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: common
Assignee: kscreen-bugs-n...@kde.org
Reporter: valdi...@gmail.com
Target Milestone: ---
SUMMARY
When the monitor is powered off and the PC is suspended, turning the PC on
first, then the monitor, results in no picture on the display, which most of
the time could not be fixed by any regular means: powering off/on the monitor
or replugging the cable to another USB-C port does not work.
This happens only in Wayland session, on both Fedora 39 (Plasma 5.27.11) and
Neon 2024 07 18 (Plasma 6.1.2). No such issues with HDMI connection.
STEPS TO REPRODUCE
1. Run KDE Plasma 5 or 6 with DisplayPort monitor
2. Suspend the PC, turn the monitor off
3. Wake up the PC, turn the monitor on (in this order)
OBSERVED RESULT
No signal on the display
EXPECTED RESULT
The monitor displays lock screen
SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 39 (also tested on Neon 2024 07 18)
KDE Plasma Version: 5.27.11 (also tested on Neon's 6.1.2)
KDE Frameworks Version: 5.115.0
Qt Version: 5.15.13
Kernel Version: 6.9.9-100.fc39.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 16 × 13th Gen Intel® Core™ i5-1340P
Memory: 28,9 GiB of RAM
Graphics Processor: Mesa Intel® Graphics
Manufacturer: Intel(R) Client Systems
Product Name: NUC13ANKi5
System Version: N11211-203
ADDITIONAL INFORMATION
The issue happens only in Wayland session, only with KDE. No issues with
KDE@X11, or Gnome@Wayland.
I have DELL P2415Q 4K monitor connected to NUC13ANKi5 via USB-C → DisplayPort
cable. No issues with HDMI connection.
`kscreen-doctor -o` over SSH shows no displays when this happens.
100% reproducibility.
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