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I changed the screen resolution on Ubuntu 12.08 using the GUI, but I think I've changed it to an unsupported resolution, and now the system logs me out immediately after I login. I tried using xrandr to fix it, but haven't had any progress yet. I can log in with the guest account though

What can I do to fix this?

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Please upload the contents of /var/log/Xorg.0.log and the contents of .xsession-errors in your home directory after a failed login attempt. – Gilles Jun 12 '12 at 22:11
do you mean 12.04 LTS or Quantal alpha? – RobotHumans Jun 12 '12 at 22:14

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