You can try tweaking your /etc/X11/XF86Config-4 file (or /etc/X11/xorg.conf if you have xorg instead of XF86) and adding the "320x240" mode in it... The list of modes X should init at startup is listed somewhere near the end of the file (can't remember the section name).
But what I really wanted to say was that it is common, but not too common - therefore, it puts an emphasis on the fact that it's not unheard of, but it also doesn't happen to almost everyone, either.... :)
Still, why do you care? Aren't we supposed to be helping this guy out...
This is an online forum - where people do write quickly and make spelling/grammar errors - even you -
you spelled inappropriate wrong in your last 2 posts in this thread.
Going back to what we should be talking about:
Did you restart X? (ctrl+alt+backspace), because the config file is only loaded at startup.