[Bug 88714] New: [HSW GT1] wrong size wm entry cause *ERROR* CPU pipe A FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=88714

            Bug ID: 88714
           Summary: [HSW GT1] wrong size wm entry cause *ERROR* CPU pipe A
                    FIFO underrun
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: myfoolishgames at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 112672
  --> https://bugs.freedesktop.org/attachment.cgi?id=112672&action=edit
20150122_fifo.log

I've noticed the error message "*ERROR* uncleared fifo underrun on pipe A"
since kernel 3.17, not sure what the best way to reproduce, sometimes it will
appear when changing to tty2 and others when the system is stressed (e.g. high
GPU usage by Chromium).

See attached log, noticed that I only needed to change to tty2 for the error
message appeared.

system: Acer C720, Haswell GT1, 2995U
kernel: 3.19rc5
xf86-video-intel: 2.99.916
mesa: 10.4.2
xorg-server: 1.16.3
distro: Arch Linux x86_64

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