[Bug 95736] New: [IVB bisected] *ERROR* uncleared fifo underrun on pipe A

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95736

            Bug ID: 95736
           Summary: [IVB bisected] *ERROR* uncleared fifo underrun on pipe
                    A
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: chris.bainbridge at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Looks similar to bug #93802 but now occurs on pipe A every boot:

[    1.446499] [drm:intel_set_cpu_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe A
[    1.446501] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A
FIFO underrun
[    1.554896] [drm:intel_check_pch_fifo_underruns] *ERROR* pch fifo underrun
on pch transcoder A

Bisect result:

ed4a6a7ca853253f9b86f3005d76345482a71283 is the first bad commit
commit ed4a6a7ca853253f9b86f3005d76345482a71283
Author: Matt Roper <matthew.d.roper at intel.com>
Date:   Tue Feb 23 17:20:13 2016 -0800

    drm/i915: Add two-stage ILK-style watermark programming (v11)

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