Hi. I followed a suggestion in ubuntuforum to disable echo 
NO_NEW_FAIR_SLEEPERS, due to system speed issue, after doing so and rebooting, 
all the sudden i got everything fixed. speed is A OK, desktop effects are back 
and no blank screen issue! I did nothing else that might have fix that so my 
best guess is that it is related some how. please check and confirm. anyway it 
seem to have done the trick for me.
cheers

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blank screen with compiz and mesa 7.6
https://bugs.launchpad.net/bugs/420599
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