[Bug 89110] Reproducible black screen glitches on DVI monitor caused by Firefox

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89110

--- Comment #1 from Chris Bainbridge <chris.bainbridge at gmail.com> ---
- The cables are Dell 50.7a2a0.041-r DVI-D so should be good

- Surprisingly, I managed to reproduce the problem from a screenshot. Opening
the screenshot in gimp and moving it to the monitor connected by passive
miniDP>DVI adaptor is enough to cause the monitor to go black.

- Manged to reproduce problem with only a fragment of the image. Opening this
in gthumb and dragging it to the centre of the monitor immediately turns it
off. Perhaps there is something specific about this pattern of data? Image
attached (img_for_rot_left.png)

- Reproduced with monitor in normal rotation (img_for_rot_normal.png) so this
is not related to the image being rotated.

- This can be reproduced with a single monitor, it is not something particular
to a multi-monitor setup.

- I tested this with 3 monitors and 4 DVI cables and 2 DP-DVI adaptors so it
seems it is a design issue somewhere rather than a one off hardware fault.

- Could this is caused by the passive miniDP>DVI adaptors? I was under the
impression that this is unlikely since they are electrically very simple, just
pass-through wires, and only about 15cm long. These are unbranded and came from
a big Ebay seller so likely quite common.

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