[Bug 100302] New: [GLK] Fifo underrun when changing resolution

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100302

            Bug ID: 100302
           Summary: [GLK] Fifo underrun when changing resolution
           Product: DRI
           Version: unspecified
          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: christophe.prigent at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 130351
  --> https://bugs.freedesktop.org/attachment.cgi?id=130351&action=edit
kern.log

System Environment
=======
Ubuntu 16.10
libdrm-2.4.75-7-gf6499b1 from http://cgit.freedesktop.org/mesa/drm
cairo 1.15.4-6-g5854dd9 from http://cgit.freedesktop.org/cairo
Kernel: 4.10.0-15ccc64 branch drm-tip from https://cgit.freedesktop.org/drm-tip
commit 15ccc648be8c8717d0e7b7d6ac6038394c15f898
Author: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira at intel.com>
Date:   Mon Feb 27 09:13:30 2017 +0200
drm-tip: 2017y-02m-27d-07h-11m-41s UTC integration manifest

Regression
=======
Tested for the first time

Bug detailed description
=======
This problem only affect eDP so far, but is sending FIFO under run in dmesg
after changing resolutions and having other programs running in the background

Reproduce Steps
==============
Enter in UI with your credentials
Open Libreoffice
Open glxgears
Open a terminal, change resolution
Xrandr --output eDP-1 --mode 1024x768
xrandr --output eDP-1 --mode 640x480
xrandr --output eDP-1 --mode 1920x1080


Expected Result
=============
dmesg should be clean of FIFO underun caused by kernel

Actual Result
===========
[  399.346861] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe A FIFO underrun
[  399.346967] [drm:intel_fbc_underrun_work_fn [i915]] Disabling FBC due to
FIFO  underrun.

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