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

Wed Feb 6 14:44:16 UTC 2019

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

Hin-Tak Leung <htl10 at users.sourceforge.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #6 from Hin-Tak Leung <htl10 at users.sourceforge.net> ---
Since using drm-tip from 2019-01-19 (6ab1ed5f8d8aa6db07bf4ee01627ab8246fc907e),
I have not observed the visual glitches.

The system has been up for 15 days, and there had been only one buffer under
run under drm-tip (in a previous boot, not the current 15-day run); 
The "Atomic update failure on pipe B" error message seems to be new to running
under drm-tip.

AFAIC, drm-tip is a lot better in a practical sense; the only remaining issue
is the gnome-shell/xorg crash with VT Switch with dual montor. Do you still
want a "drm.debug=0x1e log_buf_len=4M" dmesg? From my next reboot, obviously,
since 15 days of dmesg is a lot.

--- details below ---
reboot   system boot  5.0.0-994-generi Tue Jan 22 09:19   still running
reboot   system boot  5.0.0-994-generi Mon Jan 21 16:11   still running
reboot   system boot  5.0.0-994-generi Mon Jan 21 15:25 - 16:09  (00:43)
reboot   system boot  4.18.0-13-generi Tue Jan 15 09:58 - 15:24 (6+05:25)
reboot   system boot  4.18.0-13-generi Wed Jan  9 17:16 - 15:24 (11+22:08)

# uptime
 11:45:26 up 15 days,  2:29,  1 user,  load average: 1.57, 2.53, 2.49

# uname -a
Linux hintak-System-Product-Name 5.0.0-994-generic #201901182103 SMP Sat Jan 19
02:05:29 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

# zcat kern.log.2.gz  | grep -a ERROR | grep -v xhci_hcd
Jan 21 16:11:22 hintak-System-Product-Name kernel: [    1.769318]
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO
underrun
Jan 21 16:15:28 hintak-System-Product-Name kernel: [  262.995833]
[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

# grep ERROR kern.log.1 | grep -v  xhci_hcd
Feb  1 17:05:40 hintak-System-Product-Name kernel: [889801.832299]
[drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe B
(start=162041 end=162042) time 163 us, min 1192, max 1199, scanline start 1190,
end 1201
Feb  1 17:31:51 hintak-System-Product-Name kernel: [891373.487267]
[drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe B
(start=256262 end=256263) time 136 us, min 1192, max 1199, scanline start 1190,
end 1200

# zcat kern.log.3.gz  | grep -a ERROR | grep -v xhci_hcd
Jan 14 09:34:23 hintak-System-Product-Name kernel: [404321.983346]
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun
Jan 14 10:49:36 hintak-System-Product-Name kernel: [408834.886173]
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun
Jan 14 11:42:15 hintak-System-Product-Name kernel: [411994.377269]
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun
Jan 14 11:50:19 hintak-System-Product-Name kernel: [412477.700253]
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun
Jan 14 12:08:12 hintak-System-Product-Name kernel: [413550.759648]
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun
Jan 14 14:31:34 hintak-System-Product-Name kernel: [422153.054039]
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun
Jan 14 15:32:34 hintak-System-Product-Name kernel: [425813.727762]
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun
Jan 14 18:36:24 hintak-System-Product-Name kernel: [436844.394339]
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO
underrun
Jan 15 14:25:33 hintak-System-Product-Name kernel: [16026.662778]
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO
underrun
Jan 15 17:03:38 hintak-System-Product-Name kernel: [25512.416639]
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO
underrun
Jan 15 19:54:53 hintak-System-Product-Name kernel: [35788.228936]
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO
underrun
Jan 16 09:22:59 hintak-System-Product-Name kernel: [84276.145969]
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun
Jan 18 11:54:35 hintak-System-Product-Name kernel: [205578.023007]
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO
underrun

--- details ---

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