Vaio SB - Turn off AMD Graphics Card?

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http://askubuntu.com – I've got a Vaio SB with Hybrid Graphics (Intel Graphics Card and AMD/ATI Radeon HD 6400M/7400M Series). It is running in Dual-Boot with Windows 7 and has the latest BIOS-Update. For reason that the laptop overheats (btw. 25-30W measured with Powertop)and the fan is permanently running, I tried to deactivate the AMD, without success. I did: the vgaswitcheroo, which is usually recommended, but it definitely doesn't work for me. I tried it in every variation I could encounter online (aprox. 10, especially other Vaio S users, but they have mostly NVIDIA which can get turned off with other method (HowTos)