Reinstalling old version of mesa solved the problem for me :) Thank.
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[i945] Screen goes unresponsive on Intel 945 Chipset
https://bugs.launchpad.net/bugs/450853
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I don't know if this is related or not: from a conversation I had
before, ext4 divide the files into chunks with power of two size to
prevent long term free space fragmentation, so a 800 MB files would be
written as a 512mb chunk, then 256mb chunk and so on...
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in-place corruption of large file
