https://bugs.kde.org/show_bug.cgi?id=505954

--- Comment #9 from Jean-Francois Roy <j...@devklog.net> ---
(In reply to Nate Graham from comment #8)
> Could be the direct scanout fix in 6.4.1. Good news, and thanks for
> following up!

I just did some regression testing on this using the changelog, and it's
actually "Wayland_server: re-enable wl_drm by default."
https://invent.kde.org/plasma/kwin/-/commit/3fbcdf475b67faf129034baacfcef8b38d8306af.
I'm guessing the steam API or overlay or some other component they inject
depends on wl_drm, and if it fails, it fails the entire OpenGL context
creation, which causes SDL to fallback to software. Probably something KDE
could follow up with Valve, and probably worth an additional comment in the
code.

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