Brightness unadjustable for "High Performance" in Switchable Graphics Card Technology

Hello,
I have just transitioned to Windows 7 Professional on my Thinkpad R400(2787-A31)
However, after installing the Thinkpad Switchable Graphics Card driver, i am unable to adjust my brightness if i am using the High Performance mode. My laptop comes with ATi Radeon 3470 and Intel GMA 4500MHD.
I have already installed most of the drivers, and after some testing i realised that it was the switchable graphics driver that cause this problem. Before installation of this driver, i was on the ATi Radeon all the while and i can change the brightness.
I hope some one can help me with this driver issue. My installation of the drivers was from the support page. All except the PCI Simple Communications Controller has their drivers.
Solved!
Go to Solution.

Rosemars,
Thank you very much for solving the problem.
The key solution lies with the BIOS update. For people who cannot get the tool to work(mine keep giving an error message), there's an alternativie BIOS update utility at http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-70351
This is for R400 and T400s, for other models please select your model number at the Support page and find the utility.
Cheers & Thumb Up!

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http://img269.imageshack.us/my.php?image=47492934.png
This is Dxdiag after i set other options than Switchable Graphics
http://img30.imageshack.us/my.php?image=error3yyt.png
http://img41.imageshack.us/my.php?image=error2k.png
This is my updates.
PS: The Ati card is showing a triangle icon in Device Manager too, but i guess updating it brings the same bricking result.
Error msg "This device cannot start. (Code 10)"
Message Edited by ceecookie on 06-22-2009 07:07 AM
Message Edited by ceecookie on 06-22-2009 07:08 AM
Message Edited by ceecookie on 06-22-2009 07:41 AM

Sorry to hear you are having difficulties.
When I installed RC1 (build 7100), it came with a built-in driver that worked just fine for the discrete graphics in my W500.
A few weeks later, I installed the current release Vista driver for integrated graphics (this one) and it is working just fine as well. Installing the Lenovo driver gave me the ATI control panel (not sure what use that is), otherwise, it didn't affect performance either way.
I have switchable graphics turned off in the BIOS, OS detection turned off, and have the machine set to use the discrete graphics only. I think it would be a bit much to expect either Microsoft or Lenovo to support the switchable graphics this early in the development of Windows 7. Besides, the discrete graphics doesn't eat up the battery that much - I still get 3 hours of battery life, which is sufficient for my needs.
Maybe try turning switchable graphics and switchable graphics detection off in your BIOS, that might get you running again.
Michael
W520 (4270 CTO), which replaced a W500 (4062-27U), which replaced a T42P, which replaced an A21P...

Brightness unadjustable for "High Performance" in Switchable Graphics Card Technology

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