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dmesg | grep fglrx (after start X)
[fglrx:firegl_mmap] *ERROR* No map found!
Solution : switch back to kernel 2.6.16.13-1 and wait for a fix.
pacman -U /var/cache/pacman/pkg/kernel26-2.6.16.13-1.pkg.tar.gz
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the updated ati-fglrx package (8.24.8-2) solve the problem
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