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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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Experiencing the same issues on Samsung 900X3A. – hleinone Jul 25 '12 at 11:04
up vote 6 down vote accepted

I was able to fix this problem by installing the samsung-backlight from Linux on my Samsung PPA.

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samsung-backlight is really helpful!!! Thank you! – Alexey Plutakhin Jul 25 '12 at 13:45
Works on 900X3A after reboot, but there's no brightness indicator anymore. Thanks! – l0b0 Sep 8 '12 at 13:33

Notebook NP530U3B.

I solved this:

cat /etc/madprobe.d/blacklist-samsung.conf
blacklist samsung_laptop
blacklist samsung_backlight #if you have
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