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I'm setting up an AMD Sempron box with Kubuntu 6.10. I am using an old Daewoo monitor. I changed the screen resolution from something high (1200 x something) to a more useable (on this monitor) 800 x 600. I also chose the monitor from the manufacturer list. It all seemed OK and popped up a message to restart the X-server to use the new settings. I did a reboot (didn't notice the "restart X" option in the login/out menu) and now when I try to login I just get dumped back to the login screen. I can login as any other user and everything works fine, it's just that my personal login was the one which (in Kubuntu) has the su option.
I can login to a shell and can su from there but I don't know what I need to do to restore the screen resolution for my account to something which will work. I presume there is a file which I can edit to fix this but I don't know which file. If there is a log file which would be useful for diagnosis please tell me and I'll put the contents here.
OK; I've bitten the bullet and done a reinstall. Screen has installed at 1024 x 768 so I'll just accept that and not fiddle. Thanks anyway, I now know more about configuration than I did previously so your answers wern't wasted. Thanks again
Just press the Ctrl, Alt, and '+' keys simultaneously to scroll through the various resolutions in your xorg.conf file. (Note that the '+' key refers to the + key on the numeric keypad, not the +/= key adjacent to the Backspace key)