here’s the command i got from jogja-linux forum
$sudo dpkg-reconfigure xserver-xorg
then search for nv (means nvidia) then select your resolution.
and you can change other stuff too, like you configuring the xorgconfig in slackware.
then second way is changing manually the /etc/X11/xorg.conf
change the device for monitor
“vesa” with “nv”
PCI with “PCI:1:0:0”
then restart. walah.. yourmonitor resolution changed.