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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><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">109376</a>
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<th>Summary</th>
<td>FIFO underrun, visual glitches and instability with dual monitors
</td>
</tr>
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<th>Product</th>
<td>xorg
</td>
</tr>
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<th>Version</th>
<td>7.7 (2012.06)
</td>
</tr>
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<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>Driver/intel
</td>
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<th>Assignee</th>
<td>chris@chris-wilson.co.uk
</td>
</tr>
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<th>Reporter</th>
<td>htl10@users.sourceforge.net
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=143139" name="attach_143139" title="screenshot of visual glitches on the HDMI-connected montor">attachment 143139</a> <a href="attachment.cgi?id=143139&action=edit" title="screenshot of visual glitches on the HDMI-connected montor">[details]</a></span>
screenshot of visual glitches on the HDMI-connected montor
Here is a screenshot of visual glitches on waking the screens (pressing the esc
key).
This seems to be accompanied by
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun
in dmesg.
There also seems to be general instability with a dual monitor set-up. We have
4 computers with identical hardware, except one is only hooked up with single
monitor (VGA port) for a while. Have had screen-lock ups every few days on all
dual-monitor set-ups.
0:02.0 VGA compatible controller: Intel Corporation Device 3e92 (prog-if 00
[VGA controller])
Subsystem: ASUSTeK Computer Inc. Device 8694
Flags: bus master, fast devsel, latency 0, IRQ 125
Memory at a0000000 (64-bit, non-prefetchable) [size=16M]
Memory at 90000000 (64-bit, prefetchable) [size=256M]
I/O ports at 4000 [size=64]
[virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
Capabilities: [40] Vendor Specific Information: Len=0c <?>
Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
Capabilities: [ac] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [100] Process Address Space ID (PASID)
Capabilities: [200] Address Translation Service (ATS)
Capabilities: [300] Page Request Interface (PRI)
Kernel driver in use: i915
Kernel modules: i915
uname -a
... 4.18.0-13-generic #14-Ubuntu SMP Wed Dec 5 09:04:24 UTC 2018 x86_64 x86_64
x86_64 GNU/Linux
mesa:
18.2.2-0ubuntu1
libdrm_intel
2.4.95-1
intel_drv.so
2:2.99.917+git20171229-1ubuntu1
${HOME}/.local/share/xorg/Xorg.0.log seems to suggest that intel_drv.so is not
being used.</pre>
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