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[SOLVED] Lenovo T430 freeze (kernel lockup)

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http://ubuntuforums.org – Before writing a solution I'll describe the problem a bit and solutions I've tried. Couple month ago I've decided to change my laptop from Dell Latitude E6420 to Lenovo T430s as during the last half of the year Dell was always freezing and it was very difficult to work with it. Freezes started after system update, and my mistake was to make fresh install instead of trying to revert or investigate something... So I've bought Lenovo T430s (without nvidia), SSD drive, 16GB memory and installed Ubuntu 12.04. It was a big surprise when after using it for a while it freezed on T430s. But as I (Hardware)