# nano /etc/X11/xorg.conf
y le agregué la configuración predeterminada del monitor que yo quería y le puse mi placa de video. En resaltado amarillo está lo que le agregué:
GNU nano 2.0.7 Fichero: /etc/X11/xorg.conf
# 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" "pc105"
Option "XkbLayout" "es"
EndSection
Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
EndSection
Section "Device"
Identifier "Configured Video Device"
Driver "nv"
EndSection
Section "Monitor"
Identifier "Configured Monitor"
EndSection
Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
Defaultdepth 24
Subsection "Display"
Depth 24
Modes "1152x864"
EndSubsection
EndSection
Cualquier duda sobre el tema, me consultan. Ya soy casi un experto en edición de Xorg! Jajaja!!
Federico