System changing display configuration on its own account - from dual monitor to mirror

Question

My machine is a 13" notebook connected to a 22" external monitor. Using AMD CC I set it up so that the notebook screen is my primary monitor and the 22" my secondary.

If I am planning to watch a movie or the like I sometimes switch my notebook screen off by rotating through the available display configurations FN+F3. That works fine but as soon as I restart my PC the dual monitor setup I configured disappears and in its place I get a mirrored setup. Rotating through the configuration option doesn't help.

As a result, each time I turn off either of the screens, I have to reconfigure the dual monitor setup on next system start. That wasn't the case before with Ubuntu Natty.

How can I solve this problem?

Thank you very much in advance.

Answer 1

I should create a script that replaces your xorg.conf file after every reboot. Go into the /etc/ directory, and do the following:

sudo cp ./xorg.conf ./xorg.conf_boot
sudo nano ./script.sh

This is the content of the script to enter in nano:

!#/bin/bash 
cp /etc/xorg.conf_boot /etc/xorg.conf

Then use Ctrl+O to save and Ctrl+X to exit nano and then do the following:

sudo chmod +x ./script.sh
sudo mv ./script.sh /etc/init.d
update-rc.d script.sh defaults

I had to check out the way they do the inittab now, and I'm assuming that the thing edits the xorg.conf.