[ubuntu] Ubuntu 12.04.1 LTS ATI System Crash

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http://ubuntuforums.org – To mods: This problem was reported once in General Support, but after reading the log file and pondering on the situation as to what could have been the cause, I decided the highest possibility would be a graphics issue. However, I can't be sure and I've reposted it here. I apologize if this is against forum rules. Ubuntu randomly becomes unresponsive, and displays a "no" symbol, as in no smoking. This has happened about 3 times now and seems to happen after I switch my TV input from ubuntu (HDMI 1) to XBOX 360 (ColorStream) and back again. It does not happen every time but hap (Hardware)