changing virtual resolution

[MBP]

Im trying to get my debian install to have dual screens via xrandr. Im gettign an error msg because my virtual resolution is set to 1600x1600. how do i change my virtual resolution? I've edited x a few times to no avail.

# xorg.conf (X.Org X Window System server configuration file)

#

# This file was generated by dexconf, the Debian X Configuration tool, using

# values from the debconf database.

#

# Edit this file with caution, and see the xorg.conf manual page.

# (Type "man xorg.conf" at the shell prompt.)

#

# This file is automatically updated on xserver-xorg package upgrades *only*

# if it has not been modified since the last upgrade of the xserver-xorg

# package.

#

# If you have edited this file but would like it to be automatically updated

# again, run the following command:

# sudo dpkg-reconfigure -phigh xserver-xorg

Section "InputDevice"

Identifier "Generic Keyboard"

Driver "kbd"

Option "XkbRules" "xorg"

Option "XkbModel" "pc104"

Option "XkbLayout" "us"

EndSection

Section "InputDevice"

Identifier "Configured Mouse"

Driver "mouse"

EndSection

Section "Device"

Identifier "Configured Video Device"

EndSection

Section "Monitor"

Identifier "Configured Monitor"

EndSection

Section "Screen"

Identifier "Default Screen"

Monitor "Configured Monitor"

EndSection

Could someone please edit my X to allow a bigger resolution?

[MBP]

Just for anyone who wants to do this you need to add

# xorg.conf (X.Org X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the xorg.conf manual page.
# (Type "man xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
# sudo dpkg-reconfigure -phigh xserver-xorg

Section "InputDevice"
Identifier "Generic Keyboard"
Driver "kbd"
Option "XkbRules" "xorg"
Option "XkbModel" "pc104"
Option "XkbLayout" "us"
EndSection

Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
EndSection

Section "Device"
Identifier "Configured Video Device"
EndSection

Section "Monitor"
Identifier "Configured Monitor"
EndSection

Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
 SubSection "Display"
                Virtual                 2600 2600
        EndSubSection
EndSection

[h3%5kr3w]

hmm... I had that trouble one time while I was setting up my bud's compy to his high def tv. What video card do you have? The newest Nvidia drivers take care if it for the most part, if you have that type of video card, and the settings are easy to tweak, but if you have an ati card I have no idea as I thought they worked perfect with stuff like that in linux