Auto brightness issue on Lenovo U260

I’ve OpenSUSE 12.3 on Lenovo U260. Recently the auto brightness went haywire…I was able to reproduce the issue when I’ve my desk light shining on it. The laptop would automatically change the display brightness to 40% then 30%…stays there until I turn off my desk light. It would then drop down to 20% - 10% instead of going to 100%. Even when I use my keyboard or mouse, it won’t go back up to 100%. I’ve to always have to manually change the brightness back up.

Is there anyway I can turn off this auto brightness thing? Maybe it’s related to the ambient light sensor?

Any help? Thanks!!!