[Xorg-driver-geode] Geode LX / ThinCan / General Software BIOS - DDC failing / no EDID info

[Jordan Crouse]

On 17/01/08 14:48 -0500, Bart Trojanowski wrote:
> I got back to looking at why we get no EDID info from some units with
> General Software BIOS.  I am trying to debug why this is happening.
> 
> I would love for someone that knows DDC/EDID to suggest things to try at
> this point.
> 
> It was mentioned to me in passing that there is a chance that the serial
> port could be wired on the same pins that are responsible for the
> DDC/EDID data.  If that is the case, is there an /easy/ way to find out
> if that has been done on this unit?

Try this:
http://dev.laptop.org/~jcrouse/gpio-tool.c

If you run it as root, it should show the state of all of the GPIO pins.
You're looking for IN_AUX1 to _not_ be set on GPIO3, and OUT_AUX1 and
OUT_AUX2 to _not_ be set on GPIO4.  Section 3.2.8 in the 5536 spec has a
table that explains this.

Jordan