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      <base href="https://bugs.freedesktop.org/">
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <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>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[KBLR] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>DRI
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>DRI git
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>x86-64 (AMD64)
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux (All)
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>critical
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>DRM/Intel
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>mapengyu@gmail.com
          </td>
        </tr>

        <tr>
          <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>
      <p>
        <div>
        <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>
        </div>
      </p>


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