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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #22 from Alex Deucher <agd5f at yahoo.com> 2012-03-15 07:08:45 PDT ---
(In reply to comment #20)
> Right, thanks for your comments. In this case how about this approach:
> 
> 1. Where there is shared DDC, one end being connected will imply the other is
> disconnected.
> 

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.

> This will ensure DVI or VGA DDC is not needlessly probed (EDID fetched) for the
> unconnected end of the pair.
> 
> 2. On HPD irq force detect will run on shared DDC connector pairs.
> 
> This will ensure correct state after VGA is disconnected and DVI connected.
> Otherwise VGA remains in its "sticky connect" (can't poll for disconnected).
> 
> I can add something to pass a HPD irq flag in radeon_connector which detect
> functions would consume.
> 
> 3. I keep the code which skips expensive probing unless HPD sense has changed.
> On R600+ and only for unshared connectors.
> 
> How does this sound?

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.

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