[Bug 109376] FIFO underrun, visual glitches and instability with dual monitors

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109376

--- Comment #4 from Hin-Tak Leung <htl10 at users.sourceforge.net> ---
I am being a bit lazy and just grab the ubuntu nightly built drm-tip
(
cod/tip/drm-tip/2019-01-19 (6ab1ed5f8d8aa6db07bf4ee01627ab8246fc907e)

https://kernel.ubuntu.com/~kernel-ppa/mainline/drm-tip/2019-01-19/ )


I can't get the visual glitches any more after a few tries. 

In dmesg, there are still two drm related errors. One of them is very early in
the boot process (appearing in the frame buffer during boot up), the 2nd a few
minutes later:

journalctl  -b | grep  ERROR | grep drm
Jan 21 16:11:22 ... kernel: [drm:intel_cpu_fifo_underrun_irq_handler [i915]]
*ERROR* CPU pipe B FIFO underrun
Jan 21 16:15:28 ... kernel: [drm:intel_pipe_update_end [i915]] *ERROR* Atomic
update failure on pipe B (start=18132 end=18133) time 174 us, min 1192, max
1199, scanline start 1190, end 1202

All in all it feels more responsive.

BTW, I still get the VT related X11 crash (similar to what's in
https://bugzilla.redhat.com/show_bug.cgi?id=1630367 ) using drm-tip . Since I
am running drm-tip, is there anything I can try for look into the X11 crash
with VT switch also?

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