Problem solved. I downgraded to Mesa 8.0.4-1ubuntu1 packages from: https://launchpad.net/ubuntu/+source/mesa/8.0.4-1ubuntu1
Bug fixed.
Problem solved. I downgraded to Mesa 8.0.4-1ubuntu1 packages from: /launchpad. net/ubuntu/ +source/ mesa/8. 0.4-1ubuntu1
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Bug fixed.