[Bug 100219] New: CPU pipe A FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100219

            Bug ID: 100219
           Summary: CPU pipe A FIFO underrun
           Product: DRI
           Version: unspecified
          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: udo at hypervisor.org
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 130233
  --> https://bugs.freedesktop.org/attachment.cgi?id=130233&action=edit
dmesg

The following CPU pipe A underrun can be observed during booting Linux-4.10.X
on an Intel SNB processor. It is 100% reproducible during every boot and it
occurs before any other software runs.

[    1.071498] [drm] Initialized
[    1.071698] [drm] Disabling PPGTT because VT-d is on
[    1.071714] [drm] Memory usable by graphics device = 2048M
[    1.071717] [drm] VT-d active for gfx access
[    1.071721] [drm] Replacing VGA console driver
[    1.071736] [drm] DMAR active, disabling use of stolen memory
[    1.078093] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    1.078099] [drm] Driver supports precise vblank timestamp query.
[    1.151068] [drm] Initialized i915 1.6.0 20161121 for 0000:00:02.0 on minor
0
[    1.365751] fbcon: inteldrmfb (fb0) is primary device
[    2.224399] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A
FIFO underrun
[    2.227469] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder A
[    2.227478] [drm:cpt_irq_handler] *ERROR* PCH transcoder A FIFO underrun
[    2.414759] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device

Full dmesg attached.

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