I did try to add "UXA" to xorg.conf and it helps me so far. I haven't had any crash for two days. If I had again, I will let you all know. I follow the instruction here: http://ubuntuforums.org/showthread.php?p=7252603
But it seems the uxa is still unstable. one of the solution is to downgrade the driver as mentioned by xapient. But for me, so far adding uxa helps.
I did try to add "UXA" to xorg.conf and it helps me so far. I haven't had any crash for two days. If I had again, I will let you all know. I follow the instruction here: ubuntuforums. org/showthread. php?p=7252603
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But it seems the uxa is still unstable. one of the solution is to downgrade the driver as mentioned by xapient. But for me, so far adding uxa helps.