[Bug 58876] [GM45 DP-DVI dongle regression] transient failure to read EDID (fbcon fails then X works)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=58876

--- Comment #21 from andreas.sturmlechner at gmail.com ---
OK, this isn't funny anymore:

For months, I am fighting with 3.11 RCs to detect my external display (the
behaviour had regressed in so far that after fbcon it also didn't bring it up
in X anymore), often rebooting several times until it worked.

- so I try the same on an other external display: positive, same failure
- so I transfer my other docking station to reproduce it: positive

Then, having ruled out hardware issures with my DVI display, docking stations,
DVI cables, I think to myself: let's try out good old 3.4 series, because I
can't test this DP-DVI dongle on an other system (soon, there'll be a Haswell
box to the rescue), so at least I can try to reproduce success on older kernels
to rule out a broken dongle.

- so, I build and boot into 3.4.61 once: success
- so, I build and boot into 3.10.11 afterwards: success with fbcon as well as X
(??)
- so, I boot again into 3.11.0: success (fbcon and X) (???)


All the while, I have zero problems in my flat where the Thinkpad is connected
to a Displayport screen.

Every time I think I could come to a conclusion, there comes my system and hits
me right back in my face.

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