[Bug 81711] New: Thinkpad R51 reports [drm:i9xx_set_fifo_underrun_reporting] *ERROR* pipe A underrun

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=81711

            Bug ID: 81711
           Summary: Thinkpad R51 reports
                    [drm:i9xx_set_fifo_underrun_reporting] *ERROR* pipe A
                    underrun
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.16.0
          Hardware: i386
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: smf.linux at ntlworld.com
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

Created attachment 145201
  --> https://bugzilla.kernel.org/attachment.cgi?id=145201&action=edit
.config dmesg lspci and xorg logs

Found the following when booting my Thinkpad R51 with the latest 3.16.0 kernel.
Apart from the dmesg report the system is behaving normally, is this just a
consequence of extra reporting in the kernel or is it indicating a real
underlying
problem ?

[    0.478413] [drm] Initialized drm 1.1.0 20060810
[    0.478804] [drm] Memory usable by graphics device = 128M
[    0.478864] [drm] Replacing VGA console driver
[    0.480355] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    0.480366] [drm] Driver supports precise vblank timestamp query.
[    0.485336] [drm:i9xx_set_fifo_underrun_reporting] *ERROR* pipe A underrun
[    0.497316] [drm] initialized overlay support
[    0.520239] [drm:i9xx_set_fifo_underrun_reporting] *ERROR* pipe A underrun
[    0.550374] fbcon: inteldrmfb (fb0) is primary device
[    1.135005] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[    1.135095] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor
0
[   84.457009] [drm:i9xx_check_fifo_underruns] *ERROR* pipe B underrun
[   86.541733] [drm:i9xx_check_fifo_underruns] *ERROR* pipe B underrun
[   86.555900] [drm:i9xx_set_fifo_underrun_reporting] *ERROR* pipe A underrun
[   86.598726] [drm:i9xx_set_fifo_underrun_reporting] *ERROR* pipe A underrun

The system is LFS, glibc 2.19 gcc 4.8.2

thanks.

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