Comment 68 for bug 568611

I've got Lenovo u350 laptop with intel 4500hd graphics and Ubuntu 10.10. After installing your kernel, brightness regulation works fine, but in a little while (10-20min) the system's interface starting to freeze: graphics draw very slow, when writing in console, letters appear not immediately. Some time later it returns to normal. When I return to native kernel, it doesn't happen. Do you have any idea how to fix this?