My Linux Mint system (17 Cinnamon, lenovo g565) hangs up frequently during work (say, 2-4 times a day). It usually looks like a white or black screen (or off if the lid was closed). CPU seems to be a bit hot during this (but I cleaned the fan yesterday in order to exclude overheat reasons, and it's about 50-55 C during normal work). Hotkeys do not take effect, and I just turn the power down. Checking the syslog before hangs doesn't give me the specific repetitive pattern to check. But here is some of it (before hangs) anyway, and there is some more before eleminating nl80211 issue. Here are two more questions of mine around this problem - first,second. UPD: It doesn't seem to be a user software problem - I left the station as it is after boot, and it still hanged in a few hours. What should I do to make more specific diagnosis and eliminate the problem with hangs? Any logs, diagnostic tools I should check?