[Bug 97498] New: black flashes and black screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97498

            Bug ID: 97498
           Summary: black flashes and black screen
           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: grouchomarx.fr at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 126053
  --> https://bugs.freedesktop.org/attachment.cgi?id=126053&action=edit
dmesg

I have been faced with this issue since 4.4 (4.2 was fine, haven't tested 4.3).
Newer Kernels have improved the situation but it still occurs in 4.8rc3.

I am unable to reproduce it anymore with UXA or SNA or more than one display,
but it is still there with modesetting and a single display.


* Symptoms :
- The bottom part of the screen becomes black (just below the mouse cursor) and
comes back to normal the next frame. Sometimes there is also an horizontal
translation of the bad frame (as if the screen was shaken).

With dmesg -w, there is also an error message ONLY the first time the bug
occurs :

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

- Rarely, the screen becomes entirely black and the system can hang.

* When :
It seems to be triggered by the state of the mouse cursor (when the cursor
disappears).
The black flash occurs half of the time. The entire black screen is rare.

* How to replicate :
Open a terminal in a Xorg session
Put the mouse cursor over it
Hold a key and move the mouse over the terminal
(the goal is to make the mouse cursor appear and disappear quickly)

* Hardware :
Thinkpad X201
Intel Core i5 520M Ironlake
Intel HD Graphics
Built-in display OR external monitor on VGA

* Software :
Ubuntu 16.04 and 16.10beta (also tried Arch Linux)
Kernel 4.8.0-040800rc3-generic
Architecture x86_64
Intel driver in modesetting

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