https://bugs.kde.org/show_bug.cgi?id=468715

Zamundaaa <xaver.h...@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|wayland-generic             |platform-drm
                 CC|                            |xaver.h...@gmail.com

--- Comment #1 from Zamundaaa <xaver.h...@gmail.com> ---
> What I was able to figure out is that kwin is still trying to commit the 
> pipeline and present while in the VT. I assume that should not happen and 
> kwin should be idle until it is in the foreground again?

Indeed. What's supposed to happen is
- KWin gets notified by logind that the session is no longer active, pausing
everything it does until it gets notified the session is active again (see
DrmBackend::activate for what this does specifically)
- KWin gets EACCESS from the drm driver, so that it knows it can't submit
frames anymore (instead of only EINVAL, which almost always means KWin did
something wrong)

It seems like neither is happening for you when you switch the VT

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