[Bug 94174] New: Intel Broadwell intel_cpu_fifo_underrun_irq_handler

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94174

            Bug ID: 94174
           Summary: Intel Broadwell intel_cpu_fifo_underrun_irq_handler
           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: a.titeica at navx.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Kernel 4.5.0-rc4 x86_64

Laptop TOSHIBA SATELLITE Z30-B with Intel Broadwell: Intel(R) Core(TM) i5-5200U
CPU @ 2.20GHz

Error in the logs: 
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe C FIFO
underrun
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO
underrun

With 2 external monitors attached (HDMI and VGA) the VGA display goes blank for
a second and comes back.

A strange is that the VGA monitor is detected as eDP.

I will attach dmesg with 'drm.debug=0x1e log_buf_len=1M' on the kernel command
line, xrandr --verbose and Xorg.0.log.

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