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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #28 from Alex Deucher <agd5f at yahoo.com> 2012-03-15 08:16:33 PDT ---
(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.

> > 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.

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