Wrong detection of available VGA memory with Intel HD 3000.

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http://askubuntu.com – I'm running Ubuntu 11.10 on the Asus-A42f. The size of the VGA memory that is detected by the system is only 256 MB. But according to the specification the available memory should be 758MB. The VGA is Intel HD 3000 integrated graphics adapter. Is there a way to correct this issue? (HowTos)