xrandr supports different resolutions depending on when screen is plugged in

Fabien Chaillou fabs0028 at free.fr
Tue Apr 1 08:35:27 PDT 2008


i would guess that this is caused by the size of the framebuffer
allocated at X server startup to the maximum size of your screen.
Right now it can't be resized on the fly so  you have to provide a
virtual line in the display section of the server config file :
something like Virtual 1920 1200


Reto Bachmann-Gmür a écrit :
> Hello
> I'm getting started with my Dell M1330 laptop with its Intel i810 card
> with an external screen supporting a resolution of 1920x1200. My goal
> is to be able to switch monitors without restarting X.
> The problem is that if the monitor is not plugged in when X is
> started, "xrandr -q" indicates that the VGA monitor only supports
> 1280x1024 and "xrandr --output VGA --auto" will set the screen to that
> resolution. When the monitor is plugged in when X is started the
> maximum resolution is correctly indicated as 1920x1200 and switching
> from the built-in screen and resolution to the external one works
> nicely (using "xrandr --output VGA --off" and "xrandr --output VGA
> --auto"). Any solution/work-around other than "do not (re)start laptop
> when the monitor isn't connected"?
> Versions I'm using:
> - xorg-server
> - libXrandr 1.2.1
> - xrandr 1.2.2
> Cheers,
> reto
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