Hi,

I have a T500 and I installed Windows 7 on my T500 with Lenovo Function software running in the background. I am able to execute the Fn + LCD contrast button and it indicates on the screen but I cannot control the contrast, it(contrast) just stays at one spot.

My Model of T500 has 2 video chip-sets, one is the built-in Intel video and the other ATI Radeon 3650 video. I downloaded and run the ATI Catalyst Control centre software in the background. On boot up mode it has the ATI chipset running but I cannot control the contrast. Any idea how to solve this problem.

Thanks in advance.

I have solved this problem, upgrade the BIOS to the latest version.