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[ubuntu] [Thinkpad T430s] System freezes randomly

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http://ubuntuforums.org – Hi all, On my lenovo thinkpad T430s, the latest ubuntu freezes randomly roughly once a day. I also tried other distros, including Arch, Fedora, Mint... none of them works perfectly --- they all freeze randomly. Right now, I didn't see anything useful from the log. When the system freezes, I can do nothing bot hard reboot --- Alt-Ctrl-F1 does not work, Ctrl-Alt-Backspace neither. The only (possible) useful piece of information from the log during boot is: Code: kernel: [    5.767141] [drm] MTRR allocation failed.  Graphics performance may suffer. Does anyone have simila (Hardware)