[Intel-gfx] Unexpected behaviour of xrandr and the Intel driver on monitor hotplug

[Adam Jackson]

On Tue, 2010-05-18 at 18:07 +0100, Simon Farnsworth wrote:
> On Tuesday 18 May 2010, Adam Jackson <ajax at redhat.com> wrote:
> > On Mon, 2010-05-17 at 12:13 +0100, Simon Farnsworth wrote:
> > > The first bit of misbehaviour I'm seeing is caching of EDID across
> > > hotplug events. If I boot my system with no display attached, I
> > > correctly see no EDID property. When I connect a monitor via VGA, using
> > > cabling that supports DDC, I see EDID. When I unplug the monitor, I
> > > continue to see the old EDID. When I then plug in using a cable that
> > > doesn't support DDC, I see an extra mode appear in the mode list, but
> > > the EDID has not changed. Connecting using the original cable, or
> > > disconnecting cables completely removes this extra mode.
> > 
> > commit 725398322d05486109375fbb85c3404108881e17
> > Author: Zhao Yakui <yakui.zhao at intel.com>
> > Date:   Thu Mar 4 08:25:55 2010 +0000
> > 
> Adding that to my kernel build nearly fixed things for me. I still can't 
> explain why the 848x480 mode appears when I connect a DDC-crippled cable to 
> the GMA 945, but I can live with that, I suspect (it looks to be XServer side, 
> anyway, and I'm about to have to generate patches there, as I don't want 
> default modes).

848x480 just barely fits in the default sync ranges, is why.

- ajax
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