[Bug 103796] New: 4.9.62: intermittent flicker after upgrade from 4.9.61

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103796

            Bug ID: 103796
           Summary: 4.9.62: intermittent flicker after upgrade from 4.9.61
           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: jrf at mailbox.org
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

After upgrading from 4.9.61 there's an intermittent flicker when entering the
first character in a terminal, editor, input-box or even randomly without any
action from my side.

dmesg shows:

...
[drm:ironlake_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[drm:ironlake_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun
[drm:ironlake_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun
[drm:ironlake_irq_handler [i915]] *ERROR* PCH transcoder B FIFO underrun
...

CPU: Intel Core i3

Can't bisect this at the moment but I've seen this before:
https://bugs.freedesktop.org/show_bug.cgi?id=97283

A bad i915-related backport, I think.

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