[ltp] T40p, external monitor, DDC

André Wyrwa linux-thinkpad@linux-thinkpad.org
Thu, 12 Aug 2004 20:12:30 +0200


On Don, 2004-08-12 at 19:26, Florian Weimer wrote:
> * 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-(

You can also switch off DDC completely by using:

Option	"NoDDC"	"true"

This is not explicitly documented in man radeon, but the paragraph
quoted above hints to it. Don't know if it is deprecated, according to
my interpretation of log files it still works on current Xorg.

André.