Brightness unadjustable for 'High Performance' in the graphics card technology switchable

Hello

I just made the transition to Windows 7 Professional on my Thinkpad R400(2787-A31)

However, after installing the driver for Thinkpad switchable graphics card, I am unable to set my brightness if I use mode performance. My laptop comes with ATi Radeon 3470 and Intel GMA 4500MHD.

I have already installed most of the drivers, and after a few tests, I realized that it was the switchable graphics driver that cause this problem. Before the installation of this driver, I've been on the ATi Radeon all this time and I can change the brightness.

I hope someone can help me with this problem of driver. My installation of the drivers was the support page. All except the controller PCI of communication Simple to their drivers.

Ok........ I think I solved the problem by upgrading the BIOS with the latest version. I don't know why it would solve the problem, but it worked!

A link to the version of the BIOS 3.09/3.10 is listed below. Good luck. It is the version I've used.

http://www-307.IBM.com/PC/support/site.WSS/document.do?lndocid=MIGR-70351

Tags: Lenovo Products

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