[Bug 96284] New: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96284

            Bug ID: 96284
           Summary: [drm:intel_cpu_fifo_underrun_irq_handler [i915]]
                    *ERROR* CPU pipe A FIFO underrun
           Product: xorg
           Version: 7.7 (2012.06)
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: bollocks.k2 at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

I'm using a Tecra M11 with a QM57 chipset and a Intel 560M processor with
Ironlake graphics.  

uname -m = x86_64 
xf86-video-intel version: This has been reproduced with a git clone from May 30
2016. I noticed it with 2.99.917-19.20160530.fc23 from the Fedora repo.

uname -r = 4.5.5-201.fc23.x86_64

does not occur with 4.4.9.  it started happening in 4.5.0

Linux distro: Fedora 23 and I can also reproduce it on F24 Beta

I'm using the built in 1600x900 LCD as a display.

The problem is when I use ctrl+alt+f2/f1 to switch terminals the screen has
graphical glitches and sometimes freezes.  

For a detailed description and lots of debugging output see my bug on Red Hat
Bugzilla.
https://bugzilla.redhat.com/show_bug.cgi?id=1339855

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