*** This bug is a duplicate of bug 540112 ***
https://bugs.launchpad.net/bugs/540112
Workaround available here
http://www.thinkwiki.org/wiki/Category:W510
"To enable brightness control in X, append 'Option "RegistryDwords"
"EnableBrightnessControl=1"' to the Device-Section of xorg.conf, orginal
source:
http://www.nvnews.net/vbulletin/showthread.php?p=2204839#post2204839.
This may result in a high-pitched whine after lowering the brightness
within X. Brightness may not be lowered and raised in the same
increments on Archlinux."
Happy brightness adjusting.
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Thinkpad T510 [NVS 3100M] display brightness can't be changed
https://bugs.launchpad.net/bugs/588877
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