Please do not reply to an unrelated bug. You have a X300 (pretty well-known board which is very well supported), while bug #437332 is about Xpress/RS4xx boards (somehow-strange boards that have much worse support for multihead or so).
Please upgrade to the latest ati driver and xserver-xorg-core (uploaded to unstable yesterday) and open a new bug if the bug still occurs. Make sure you attach to the bug the whole output of xrandr --verbose before and after "fixing" the virtual size with --auto. If you can test ati and xserver-xorg-core from experimental, that would be great as well. And if this bug did not occur before a recent upgrade, please tell us when it first appeared. Brice -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]