https://bugs.kde.org/show_bug.cgi?id=454387
Bug ID: 454387
Summary: HDMI signal loss when connecting to a KDE Linux PC in
a Wayland session from a 4-port HDMI KVM switch (in a
KDE X11 session it works fine)
Product: KScreen
Version: 5.24.5
Platform: Manjaro
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: common
Assignee: kscreen-bugs-n...@kde.org
Reporter: rondo...@gmail.com
Target Milestone: ---
SUMMARY
I have connected a Manjaro Linux KDE PC to an HDMI KVM switch of 4 ports (for 4
PC). If I'm in KDE with an X11 session, switching from another machine to the
Linux machine is almost instantaneous, it only takes 2-3 seconds. But if I'm on
KDE with a Wayland session, when I switch to the Linux computer the HDMI signal
is lost, the screen goes black and it takes 15-20 seconds to get the signal
back.
STEPS TO REPRODUCE
1. Connect at least two PCs to an HDMI KVM switch (of 4 ports), one of which is
a Linux KDE.
2. The Linux KDE must have a Wayland session started.
3. Switch to the other computer with the HDMI KVM switch.
4. Change and return back to the Linux KDE computer with the HDMI KVM switch.
OBSERVED RESULT
HDMI signal is lost when switching to Linux KDE Wayland session machine. The
screen goes black and the HDMI signal is not recovered until after 15 or 20
seconds.
EXPECTED RESULT
When switching with the HDMI KVM switch to the Linux KDE Wayland machine, the
HDMI signal should not be lost and the switch should be almost instantaneous,
like when in a Linux KDE X11 session.
SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Plasma: Manjaro Linux KDE
(available in About System)
KDE Plasma Version: 5.24.5
KDE Frameworks Version: 5.94.0
Qt Version: 5.15.4
ADDITIONAL INFORMATION
Tested with Kernels 5.17.9 and 5.18.0 and with two different HDMI KVM switches
of different brands (all of 4 ports), and in all cases the same thing happens.
And as I say, if the PC Linux KDE computer is in an X11 session, it works
perfectly.
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