Display driver issue for D845GVSR

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http://askubuntu.com – I have recently installed Kubuntu 12.04 on my desktop. The bootup works fine and there are no issues with the screen resolution or any other video related activity. But while the system is being used, the display gets reset (i.e. the screen becomes black and then comes back) and from then on the display gets into an issue. Playing a video file using any player does not give any video output (it gives the audio output). This problem occured in Ubuntu 11.10 as well. I have a dual boot with windows and could not find any such issues with windows. I wanted to move completely to Ubuntu (Linux). Ple (HowTos)