All you need to do is edit your xorg.conf file.
open your Konsole
type
su
password: <enter our password>
type
cd /etc/X11/
type
cp xorg.conf orig.xorg.conf (so U have a backup
type
vi xorg.conf
now just change exerything that says
800 600 to your desired resolution. I changed mine to 1280 1024. should be abour 4 or 5 lines to change.
vi commands:
[esc] i = insert
[esc] x = delete
[esc] :wq = write changes and quit vi (thats a colon)
OK now restert X w/ ctrl + alt + backspace
should be all good