[Bug 95062] i915: GPU HANG: reason: Ring hung (with LibreOffice on KDE Plasma)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95062

--- Comment #2 from Moritz Bunkus <moritz at bunkus.org> ---
Thanks for such quick feedback.

This is the first time I've ever encountered GPU hangs with Intel cards. I've
tried to reproduce such a hang with 1.18.1 over the last hour by
double-clicking on a CSV file (which starts LibreOffice which immediately
displays its CSV import dialog), but no luck. LibreOffice's CSV import dialog
flickers shortly when it's displayed on 1.18.1, but there's no hang, and the
dialog is usable immediately.

By contrast on 1.18.3 the CSV import dialog looks broken, the whole X hangs. If
I cancel the dialog by pressing ESC the GPU will usually be reset, LibreOffice
closed and I can continue working in X. If I don't press ESC and simply wait
then X will crash.

I'm attaching new files as requested: Xorg.0.log.old and the content of
/sys/class/drm/card0/error (along with a fresh dmesg output). Please note that
this time X crashed, and systemd immediately restarted the display manager. The
Xorg.0.log.old file is from the run that crashed, not from the new instance by
the restarted display manager. However, I don't know whether restarting has an
effect on the content of "error". If so I can turn off auto-restarts of the
display manager and try again.

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