https://bugs.kde.org/show_bug.cgi?id=387993
Bug ID: 387993
Summary: Compositor freeze external screen when plugging HDMI
output after boot
Product: kwin
Version: 5.11.4
Platform: Archlinux Packages
OS: Linux
Status: UNCONFIRMED
Severity: normal
Priority: NOR
Component: compositing
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Hi everyone,
I am using a Dell XPS 9560 running Archlinux (with KDE Plasma) as my daily
driver.
In terms of graphics, I only use the Intel graphics and have the NVidia card
disabled (/proc/acpi/bbswitch is OFF).
I tend to have my laptop connected to an external screen in extended desktop
mode (either through the HDMI output or an adapter / hub through the USB-C /
Thunderbolt 3 port).
If I boot my laptop with the screen connected, everything works.
However if I disconnect the screen and plug it back in, I end up with the
second screen showing the exact screen of the main laptop screen from the
moment I plugged the cable. The external screen is kind of freezed on that
image.
If I grab a window from the main screen and move it to the external screen with
my mouse, I onlw see the mouse moving on the second screen. The window seem to
be moved as well as I can see it disappearing progressively from the main
screen and I can grab it back (through a keyboard shortcut) to the main screen.
It's like there is an overlay showed between where the normal extended desktop
should be and the cursor that's 'frozen'.
In order to unfreeze the second screen and have the dualscreen setup work again
I need to press Shift+Alt+F12 to suspend the compositor. After that, my desktop
is fully functionning again.
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