Not enough information to troubleshoot. See
http://wiki.ubuntu.com/X/Reporting for instructions on reporting X
issues.
In particular, this is likely to be a video driver issue rather than the
xrandr command line tool. Since you didn't specify your driver I'm just
unsetting the package. Feel free to reopen and fix the package name, if
this issue still persists on Jaunty.
** Changed in: xrandr (Ubuntu)
Status: New => Invalid
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xrandr, VGA and LVDS cannot use preferred modes simultaneously
https://bugs.launchpad.net/bugs/330700
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