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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 - [KBLR] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104168">104168</a>
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<th>Summary</th>
<td>[KBLR] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>DRI git
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>critical
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Intel
</td>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>mapengyu@gmail.com
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
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<pre>Created <span class=""><a href="attachment.cgi?id=136045" name="attach_136045" title="drm-intel-next-queued-i915-fifo-underrun-log">attachment 136045</a> <a href="attachment.cgi?id=136045&action=edit" title="drm-intel-next-queued-i915-fifo-underrun-log">[details]</a></span>
drm-intel-next-queued-i915-fifo-underrun-log
CPU: Model name: Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz
GPU:
00:02.0 VGA compatible controller [0300]: Intel Corporation Device [8086:5917]
(rev 07) (prog-if 00 [VGA controller])
Subsystem: Lenovo Device [17aa:2259]
Flags: bus master, fast devsel, latency 0, IRQ 154
Memory at e1000000 (64-bit, non-prefetchable) [size=16M]
Memory at c0000000 (64-bit, prefetchable) [size=512M]
I/O ports at e000 [size=64]
[virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: i915
Kernel modules: i915
Kernel tested:
git: drm-intel branch drm-intel-next/drm-intel-next-queued
git: linux 4.15-rc1/4.14/4.13
How to reproduce:
1, Connecting one external monitor(Dell 1080P/4k tested) to the laptop with
HDMI cable.
2, switch the display mode in mirror/external/internal/extend modes.
3, After sometimes, internal or exteranl monitor will blink and tear.
logs attached with drm.debug=0xce.
Distro: Ubuntu 16.04.3
Xorg version:
ii xserver-common 2:1.18.4-0ubuntu0.7
all common files used by various X servers
rc xserver-xorg 1:7.7+13ubuntu3
amd64 X.Org X server
rc xserver-xorg-core 2:1.18.4-0ubuntu0.7
amd64 Xorg X server - core server
ii xserver-xorg-core-hwe-16.04 2:1.19.3-1ubuntu1~16.04.4
amd64 Xorg X server - core server
ii xserver-xorg-hwe-16.04 1:7.7+16ubuntu3~16.04.1
amd64 X.Org X server
ii xserver-xorg-legacy-hwe-16.04 2:1.19.3-1ubuntu1~16.04.4
amd64 setuid root Xorg server wrapper
ii xserver-xorg-video-all-hwe-16.04 1:7.7+16ubuntu3~16.04.1
amd64 X.Org X server -- output driver metapackage
ii xserver-xorg-video-fbdev-hwe-16.04 1:0.4.4-1build6~16.04.1
amd64 X.Org X server -- fbdev display driver
ii xserver-xorg-video-intel-hwe-16.04
2:2.99.917+git20170309-0ubuntu1~16.04.1 amd64 X.Org X server --
Intel i8xx, i9xx display driver</pre>
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