[Bug 89110] Reproducible black screen glitches on DVI monitor with specific image using passive DP-DVI adaptor

[bugzilla-daemon at freedesktop.org]

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

--- Comment #11 from Chris Bainbridge <chris.bainbridge at gmail.com> ---
I found some relevant thread on the Dell site, it seems this was an issue that
affected several Dell models made around 2009. Final comment from Dell:

"Posted by DELL-Chris
I never could find a solid fix, several workarounds for PC, none for Macs. The
issue does not occur for everyone and we could never replicate it in our lab."

One user posted some images that reproduced the issue on a 2709W
http://en.community.dell.com/support-forums/peripherals/f/3529/t/19257125 

"I have the same issue with my 2709W (rev A01). I have made some experiments to
find a way to reproduce the problem.... To reproduce the issue, just display
the first image on your screen with a 1:1 pixel ratio (ex in your browser) and
move the window, the screen should flicker while you move the window."

That is basically what I see and the liney pattern of the posted images is
similar to the basic pattern in mine (except my lines were text rather than
solid lines).

Some users reported that Sapphire fixed the problem with a BIOS update but for
other manufacturers it was still an issue. Using active DisplayPort was the
recommended workaround in the end.

I did notice that the issue occurs from 55Hz up to 64Hz but 65Hz seems ok.
Perhaps some power issue or signal integrity or minimum sync frequency is
required... something odd anyway, nobody knows.

So to conclude, it seems like the problem is probably not the passive DVI
adaptors, but some unusual incompatibility between these particular monitors
and particular graphics cards.

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