For those considering an Asus UL80Vt or UL30Vt, even if the BIOS doesn't specify an option to switch on/off the discrete graphics card, there is still an alternative in Linux, which is to use grub2-efi. It's been done for other linux hybrid graphics laptops (e.g. apple macbooks, sony vaio z-series, etc.) and it's in active development.
http://grub.enbug.org/TestingOnEFI
http://ubuntuforums.org/showthread.php?t=995704
There are several Linux users investigating [1] with these kind of laptops, so it is reasonable to expect this feature to appear soon for Asus UL30/UL80 laptops.
[1] https://lists.launchpad.net/sony-vaio-z-series/msg00897.html
http://grub.enbug.org/TestingOnEFI
http://ubuntuforums.org/showthread.php?t=995704
There are several Linux users investigating [1] with these kind of laptops, so it is reasonable to expect this feature to appear soon for Asus UL30/UL80 laptops.
[1] https://lists.launchpad.net/sony-vaio-z-series/msg00897.html
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