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<body><span class="vcard"><a class="email" href="mailto:htl10@users.sourceforge.net" title="Hin-Tak Leung <htl10@users.sourceforge.net>"> <span class="fn">Hin-Tak Leung</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEW "
title="NEW - FIFO underrun, visual glitches and instability with dual monitors"
href="https://bugs.freedesktop.org/show_bug.cgi?id=109376">bug 109376</a>
<br>
<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEEDINFO
</td>
<td>NEW
</td>
</tr></table>
<p>
<div>
<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - FIFO underrun, visual glitches and instability with dual monitors"
href="https://bugs.freedesktop.org/show_bug.cgi?id=109376#c6">Comment # 6</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - FIFO underrun, visual glitches and instability with dual monitors"
href="https://bugs.freedesktop.org/show_bug.cgi?id=109376">bug 109376</a>
from <span class="vcard"><a class="email" href="mailto:htl10@users.sourceforge.net" title="Hin-Tak Leung <htl10@users.sourceforge.net>"> <span class="fn">Hin-Tak Leung</span></a>
</span></b>
<pre>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 ---</pre>
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