[Bug 47007] HDMI monitor polling causing 100ms rendering stalls

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=47007

--- Comment #30 from Alex Deucher <agd5f at yahoo.com> 2012-03-15 08:45:10 PDT ---
(In reply to comment #29)
t sure what the right answer is.
> 
> Is it possible to have DVI-D + VGA breakout cable from a single DVI-I which
> would give two independent simultaneous outputs? If not then it looks to me
> only one KMS connector can be connected at a time.
> 

It's possible.  there are two separate encoders (dac and tmds) that can be
driven independently connected to the single port. However, it's not something
we support since you wouldn't be able to fetch the EDIDs from each monitor
directly and it's confusing to users since there is only one physical port on
the board.

> 
> Hm, shared_ddc is also set with single physical DVI-I connector, at least on
> this motherboard. 

According to your vbios tables there are actually 3 physical connectors on this
board, VGA, DVI-D, and DP.  If there are only two physical connectors DP and
DVI-I port, then the oem set up the connector tables wrong and we need a quirk
to properly expose it as single DVI-I connector.

> 
> Could you clarify what EDID do you get with two physical connectors which share
> DDC?

Garbage? whichever one happens to go first?  It's not really an ideal scenario,
but sometimes oems do broken things.

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