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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #29 from Tvrtko Ursulin <tvrtko.ursulin at onelan.co.uk> 2012-03-15 08:34:48 PDT ---
(In reply to comment #28)
> (In reply to comment #26)
> > > 
> > > I'm not sure we necessarily want to do that.  Even though they may have a
> > > shared ddc line, it would be nice to report the proper connected status.
> > 
> > What do you consider the proper connected status? With DVI-I made out of VGA-1
> > and DVI-1 in software, only one of them should be connected at a time, no?
> > 
> 
> I'm not 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.

> > > What about the following:
> > > 
> > > DVI + VGA with shared ddc line.
> > > VGA connected and in use.  User connects DVI port, gets hpd irq, detect called.
> > >  hpd sense returns true, DVI is updated as connected, VGA is marked as
> > > disconnected.  User then potentially loses the monitor they are currently
> > > using.
> > 
> > Are you implying DVI + VGA with shared DDC lines come as either one shared
> > (DVI-I) connector, or two physical ones (DVI-? + VGA)? This is a very deep hole
> > indeed...
> 
> Yes, the shared_ddc flag is only set of there are two different physical
> connectors that are both wired to the same ddc line (e.g., a separate VGA plug
> and HDMI plug).  With DVI-I it's a single physical connector.  DVI-I ports
> always have a single ddc line.

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

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

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