After some trials and errors, I found that the bug comes from the way the
buffer is locked when copying texture content to memory. It seems that
HBL_READ_ONLY doesn't work. With HBL_NORMAL I've got no more problem. Here
is the little patch to fix this bug, hoping it doesn't break anything else.

http://www.nabble.com/file/p15268870/patch-fglrx-save-frames.txt
patch-fglrx-save-frames.txt 
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