[Bug 89806] New: [IVB] boot error: *ERROR* uncleared pch fifo underrun on pch transcoder A

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89806

            Bug ID: 89806
           Summary: [IVB] boot error: *ERROR* uncleared pch fifo underrun
                    on pch transcoder A
           Product: DRI
           Version: DRI 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: chris.bainbridge at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 114692
  --> https://bugs.freedesktop.org/attachment.cgi?id=114692&action=edit
dmesg-intel-drm-14.txt

Hardware is Macbook Pro 2012 13" with three monitors.

Kernel is drm-nightly 07e5c9b5 and 4.0.0-rc5+ 7fc377e

On every boot there is the error:

Mar 29 02:25:17 debian kernel: [drm:intel_set_pch_fifo_underrun_reporting]
*ERROR* uncleared pch fifo underrun on pch transcoder A
Mar 29 02:25:17 debian kernel: [drm:intel_dump_pipe_config] ips: 0
Mar 29 02:25:17 debian kernel: [drm:intel_pch_fifo_underrun_irq_handler]
*ERROR* PCH transcoder A FIFO underrun

Apart from that, everything seems to work ok. This might have been around for a
while - the Debian Jessie 3.16.0 kernel also complains:

Mar 29 00:18:19 debian kernel: [drm:cpt_set_fifo_underrun_reporting] *ERROR* 
uncleared pch fifo underrun on pch transcoder A
Mar 29 00:18:19 debian kernel: [drm:cpt_serr_int_handler] *ERROR* PCH 
transcoder A FIFO underrun

dmesg with drm.debug=14 attached

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