[Bug 71660] displayport to dvi adapter preventing display detection

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71660

--- Comment #5 from Jesse Barnes <jbarnes at virtuousgeek.org> ---
Ok the HDMI vs DP thing makes sense if this is a passive dongle.  In that case,
it just level shifts and ends up talking to our HDMI port on the chip.  So DP
wouldn't be involved in that case.

I see the kernel properly detects that HDMI is enabled at boot time, but then
fails to detect any modes later on, so assumes the output is disconnected.  I
wonder if this has something to do with the dongle...

If this worked in 3.5 and failed in 3.6, I wonder if you can bisect it.  That
might give us some clues at least...

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