randr 1.2 and intel driver

Keith Packard keithp at keithp.com
Thu Mar 29 16:58:37 PDT 2007

On Thu, 2007-03-29 at 19:11 +0200, Lukas Hejtmanek wrote:
> Hello Keith,
> is there a way how to setup output device (VGA) that is not connected? I've
> already asked this question and I told me that I need to insert such mode. How
> can I do that?

$ xrandr --newmode CustomMode ...
$ xrandr --addmode VGA CustomMode
$ xrandr --output VGA --mode CustomMode

This creates a custom modeline, adds it to the list of available modes
for the VGA output and then turns on the VGA using that mode.

> I think this is important as there are some projectors that wait for input
> from laptop, when no input they stay off and do not send any signal to VGA
> connector. So it is classic deadlock here, a laptop is waiting for signal from
> a projector and the projector is waiting for signal from the laptop.

Nope; just plug the projector in and the laptop will detect the presense
of the projector automatically. You should never need to use the above
set of commands.

keith.packard at intel.com
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