I am using Ubuntu 12.04 on a Samsung 530U3B laptop. Screen blinks on adjusting the brightness and CPU load grow up to 100%.
Video device: Intel(R) Extreme Graphics 3 Controller.
Seems like it started after kernel upgrade to 3.2.0-27-generic-pae.
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I was able to fix this problem by installing the
samsung-backlight from Linux on my Samsung PPA.