[Bug 104168] New: [KBLR] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104168

            Bug ID: 104168
           Summary: [KBLR] [drm:intel_cpu_fifo_underrun_irq_handler
                    [i915]] *ERROR* CPU pipe A FIFO underrun
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: mapengyu at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 136045
  --> https://bugs.freedesktop.org/attachment.cgi?id=136045&action=edit
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

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