I am able to solve this issue.
It basically not the media drivers issue but a issue with ATI drivers.
Please refer below thread for solution. i hope it works. Working so far, I am able to boot well with this solution applied.
http://ubuntuforums.org/showthread.php?t=1315199
Code:
sudo aticonfig --initial -f
sudo aticonfig --acpi-services=off
The acpi-services was bugging me. But I don't know how does actually helps my system to solve it. what changes it does to my system in background.
Do let me know if you have any comments or ideas...
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