Ignore laptop LCD when external display present

Alexej Davidov alexej.davidov at gmx.net
Fri Mar 9 13:05:35 PST 2007

On Fri, 09 Mar 2007 13:52:23 -0600
Ian Pilcher <i.pilcher at comcast.net> wrote:

> I have a ThinkPad T42 with an ATI Radeon Mobility M7 chip (radeon
> driver) and a built-in 1024x768 LCD.  I also have a port replicator
> and a 1280x1024 LCD monitor.  When the laptop is in the port
> replicator (to which the external LCD is connected), I would like X
> to ignore the built-in 1024x768 LCD and exclusively use the external
> 1280x1024 LCD.
> Is this possible?  The "default" behavior seems to limit the
> resolution displayed on the external LCD to 1024x768 (the resolution
> of the built- in LCD).  I can force things with the PanelSize option,
> but that makes the built-in display useless when the laptop isn't in
> the port replicator.
> Thanks!
AFAIK, radeon driver doesn't support hotplugging of monitors yet. So
you would have to start X with the external monitor connected. Then you
can switch between them with xrandr. "xrandr -q" should give the
available modes.


More information about the xorg mailing list