[ltp] T40p, external monitor, DDC

[Florian Weimer]

* Austin Murphy:

> Take a look at this option for the radeon driver:
>
>        Option "IgnoreEDID" "boolean"
>               Do  not  use EDID data for mode validation, but DDC
>               is still used for monitor detection. This  is  dif
>               ferent from NoDDC option.
>               The default value is off.
>
> (from radeon man page)

Tried it, doesn't help.  Unfortunately, the "dcc" module appears to be
compiled in, so I'm not able to disable it completely and test that
configuration. 8-(