I have a Lenovo U350 and the problem is *not* fixed as of kernel  2.6.32

$ uname -a
Linux lenovo-u350 2.6.32-020632rc5-generic #020632rc5 SMP Fri Oct 16 09:06:17 
UTC 2009 x86_64 GNU/Linux

$ dmesg |tail
[  240.118833] ACPI: Failed to switch the brightness
[  240.614684] ACPI: Failed to switch the brightness


** Attachment added: "lspcivvv.txt"
   http://launchpadlibrarian.net/34081772/lspcivvv.txt

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brightness dark and not working on acer 5715
https://bugs.launchpad.net/bugs/401591
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