[Bug 93098] New: Display flickers and turns solid grey when mouse moved quickly to left edge

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93098

            Bug ID: 93098
           Summary: Display flickers and turns solid grey when mouse moved
                    quickly to left edge
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: bradgarcia at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Hardware: Intel NUC5CPYH, output via HDMI
Display: Dell 2405FPW 1920x1200 monitor, DVI input using an HDMI-to-DVI adapter
OS: Ubuntu 15.10
arch: x86_64
kernel: 4.2.0-18-generic
Ran Intel Graphics Installer 1.2.1, but my understanding is that this doesn't
actually change the driver used, correct?

Issue:
If I flick the mouse so that the pointer quickly travels from the middle to the
left edge (in the lower portion of the display), I'll sometimes (1 in 4 tries)
get the display to "flicker".  And sometimes, instead of just flickering, it
will instead turn all light grey and stay in that state.

The computer is still running - any music that was playing continues to play. 
I can still ssh into the machine and run a shell.  If I hit CTRL-ALT-F1, it
appears to switch virtual consoles, as the screen changes to all black - but no
text is displayed.

Workarounds:
Rebooting the computer fixes the problem.
Suspending the computer & then waking it up also fixes the problem.

dmesg:
I do not see any new dmesg being output when this flickering (or the blank
screen) occurs, but there are some suspect messages earlier in the log:

$ dmesg | grep intel
[    1.388542] intel_idle: MWAIT substates: 0x33000020
[    1.388547] intel_idle: v0.4 model 0x4C
[    1.388550] intel_idle: lapic_timer_reliable_states 0xffffffff
[    1.704352] fb: switching to inteldrmfb from EFI VGA
[    1.827843] fbcon: inteldrmfb (fb0) is primary device
[    1.828074] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[    5.624276] snd_hda_intel 0000:00:1b.0: bound 0000:00:02.0 (ops
i915_audio_component_bind_ops [i915])
[    6.477293] intel_rapl: Found RAPL domain package
[    6.477299] intel_rapl: Found RAPL domain core
[  360.262740] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe C FIFO underrun

$ dmesg | grep ERROR
[    0.190315] acpi PNP0A08:00: _OSC failed (AE_ERROR); disabling ASPM
[    2.160410] [drm:valleyview_update_wm [i915]] *ERROR* timed out waiting for
Punit DDR DVFS request
[    7.504199] [drm:valleyview_update_wm [i915]] *ERROR* timed out waiting for
Punit DDR DVFS request
[    9.687075] [drm:valleyview_update_wm [i915]] *ERROR* timed out waiting for
Punit DDR DVFS request
[    9.707438] [drm:valleyview_update_wm [i915]] *ERROR* timed out waiting for
Punit DDR DVFS request
[    9.874539] [drm:valleyview_update_wm [i915]] *ERROR* timed out waiting for
Punit DDR DVFS request
[   28.361870] [drm:valleyview_update_wm [i915]] *ERROR* timed out waiting for
Punit DDR DVFS request
[   30.589794] [drm:valleyview_update_wm [i915]] *ERROR* timed out waiting for
Punit DDR DVFS request
[   30.609787] [drm:valleyview_update_wm [i915]] *ERROR* timed out waiting for
Punit DDR DVFS request
[   31.027400] [drm:valleyview_update_wm [i915]] *ERROR* timed out waiting for
Punit DDR DVFS request
[   44.357843] [drm:valleyview_update_wm [i915]] *ERROR* timed out waiting for
Punit DDR DVFS request
[  114.932016] [drm:valleyview_update_wm [i915]] *ERROR* timed out waiting for
Punit DDR DVFS request
[  116.407431] [drm:valleyview_update_wm [i915]] *ERROR* timed out waiting for
Punit DDR DVFS request
[  120.322528] [drm:valleyview_update_wm [i915]] *ERROR* timed out waiting for
Punit DDR DVFS request
[  130.559557] [drm:valleyview_update_wm [i915]] *ERROR* timed out waiting for
Punit DDR DVFS request
[  251.352101] [drm:valleyview_update_wm [i915]] *ERROR* timed out waiting for
Punit DDR DVFS request
[  251.707114] [drm:valleyview_update_wm [i915]] *ERROR* timed out waiting for
Punit DDR DVFS request
[  252.192934] [drm:valleyview_update_wm [i915]] *ERROR* timed out waiting for
Punit DDR DVFS request
[  253.288239] [drm:valleyview_update_wm [i915]] *ERROR* timed out waiting for
Punit DDR DVFS request
[  256.803667] [drm:valleyview_update_wm [i915]] *ERROR* timed out waiting for
Punit DDR DVFS request
[  341.079074] [drm:valleyview_update_wm [i915]] *ERROR* timed out waiting for
Punit DDR DVFS request
[  360.262740] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe C FIFO underrun

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