laptop not setting correct external monitor resolution on startup

katesfb · 10-13-2009, 04:23 PM

Hi,
I have a laptop with an external monitor, after a recent upgrade from xubuntu 8.10 to 9.04 i found that the external monitor was no longer being set to the correct resolution, was being set to the laptop resolution. Each time i boot up i have to use "display settings" or "monitor settings" from the main menu to do it manually which i didnt have to do before. Is there a way to do this manually. Any help is much appreciated.

Cheers.

SharpyWarpy · 10-15-2009, 05:48 AM

Do you have a file /etc/X11/xorg.conf ? You might have to generate one -- AFTER you adjust your monitor resolution -- like this:
Xorg -configure :1
It will be created in your home directory as "xorg.conf.new", which you can copy as "xorg.conf" to /etc/X11 directory. Hope this helps.

katesfb · 10-16-2009, 12:14 AM

Hi Sharpy,
Thanks for the reply but it didnt actually work (i thought it would). I Did the following:
used the command Xorg -configure :1, which created the file xorg.conf.new. I renamed the existing file from xorg.conf to xorg.conf.old and renamed the file xorg.conf.new to xorg.conf and put it in the etc/X11 directory.

I thought that this would work but it had no effect. Obviously there is some other system that governs monitor resolution particularly at startup.

Any other ideas.

Cheers.

katesfb · 10-21-2009, 04:27 PM

Hi,
I found that the xrandr command is all i need to detect the external monitor and set it up correctly etc however where can i put the xrandr commands so that they can be used to turn off the laptop screen and set the external monitor at startup?

Any help is much appreciated.

Cheers.

rkski · 10-22-2009, 12:07 AM

Hi
If you want the commands to be run at startup, put them in /etc/rc.local script.