[Bug 75629] [r128] Changes needed for RandR support

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75629

Connor Behan <connor.behan at gmail.com> changed:

           What    |Removed                     |Added
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  Attachment #99694|0                           |1
        is obsolete|                            |

--- Comment #21 from Connor Behan <connor.behan at gmail.com> ---
Created attachment 99793
  --> https://bugs.freedesktop.org/attachment.cgi?id=99793&action=edit
Patch with detection

I could not find changes to hardware state before and after the vbe stuff but I
found an easier way to detect monitors. That is a simple call to
xf86I2CProbeAddress(). In other words, xf86DoEDID_DDC2() was getting far enough
to tell that there was a monitor. It only returned NULL because it was not
getting a valid EDID.

Detecting the valid modes with EDID would be nice, but I think this solves the
most important problem. The driver now knows whether a monitor is plugged in
and hence whether to drive Crtc2. If you agree, I will send this patch to the
list.

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