[Bug 28267] no video on imac 27 (regression)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28267

--- Comment #5 from Alex Deucher <agd5f at yahoo.com> 2010-06-29 15:46:04 PDT ---
That commit doesn't really break anything per se.  Before that commit the
driver wasn't touching the display hardware for that connector so you ended up
with the output in the state left by the bios.  The problem is the dp link
training is not completing so the display never comes up.  There seems to be a
general issue training 2560x1440 dp monitors.  I suspect this is a case where
there are several different combinations of link rates and lanes that could
support that mode, but the monitor only likes certain ones.

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