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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #23 from Alex Deucher <agd5f at yahoo.com> ---
(In reply to comment #21)
> Created attachment 99793 [details] [review]
> 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.

There wouldn't be any changes in the state before and after.  You'd need to
trace the actual EDID fetch process to see which gpios are used for i2c.

> 
> 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.

Does it actually change when you have a monitor vs. not?  If probing works, you
are probably pretty close to getting full i2c working.

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