[Bug 93945] New: [ILK] [v4.5-rc1] FIFO underrun and flickering screen on cursor hide

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93945

            Bug ID: 93945
           Summary: [ILK] [v4.5-rc1] FIFO underrun and flickering screen
                    on cursor hide
           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: peter at lekensteyn.nl
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Since upgrading the kernel from v4.3 to v4.5-rc1-28-g03c21cb on a laptop
running Arch Linux (i5-560M), I experience a flickering screen when the cursor
is hidden. This happens on both the internal LVDS panel and an external HDMI
monitor.

Example dmesg lines:

[  192.695484] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe A FIFO underrun
[  192.696897] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH
transcoder A FIFO underrun

Steps to reproduce:

 1. Open Konsole (from KDE).
 2. Press Ctrl (cursor is hidden).
 3. Observe flickering screen (first occurrence, e.g. after suspend also
results in dmesg entries).
 4. Move the pointer to make it visible again, possible repeating step 2 if 3
did not happen.

Alternative steps to reproduce:

 1. Have two monitors connected (internal LVDS and external HDMI).
 2. Move the mouse between them (back and forth).
 3. Observe a flickering screen on the monitor where the cursor left.

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