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Can you tell me how to enable the 'backing store' feature in Ubuntu 12.04?

I tried adding xserver-command=X +bs to /etc/lightdm/lightdm.conf. With this configuration setting xserver fails to start correctly. I get a frozen window with a message saying resolution is set to a small value (I think it was 800x480, but I can't recall).

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Are using 12.04 desktop or Server. –  Mitch Jul 18 '12 at 13:55

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