asus-switcheroo: the first sane GPU switch solution for asus (and some other) laptops
 

https://github.com/awilliam/asus-swi.../master/README

Be sure to share your results on the mailing list.

https://lists.launchpad.net/hybrid-graphics-linux/
hybrid-graphics-linux@lists.launchpad.net

Current (at time of posting) but not exhaustive list of working models

Asus.UL30VT
Asus.UL50VT
Asus.UL80VT.1.0
HP.dm3
HP.SLIC-MPC
Lenovo.T410.2516CTO
Lenovo.T410s
Lenovo.T510
Sony.Vaio.VPCZ136GG
Sony.Vaio.VPCZ13V9E
Sony.VGN-Z51XG
Sony.VPCZ12C5E
Acer 5742G
Acer 5935g
Acer Aspire 5935
Asus K42Jc
Asus K52Jc
Asus N53Jf
Asus N53Jf
Asus N53SN
Asus N53SV
Asus N61JV
Asus N71JV
Asus N73SV
Asus P52JC
Asus U30JC
Asus U33JC
Asus U35JC
Asus U35JC
Asus U36JC