As with kakukri, I can confirm that Aren Olson's easy to implement fix
has my Lenovo Thinkpad X61 Tablet brightness working perfectly, now. He
suggested adding the following line:
options thinkpad_acpi brightness_enable=1
to the end of the following file:
/etc/modprobe.d/options
Once I made this change, and rebooted, the think pad brightness keys
starting actually changing the brightness. The applet was already
working before the change, as other's have mentioned. This is under
Ubuntu hardy alpha6 with all the updates, which puts me on kernel
2.6.24-12-generic
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[REGRESSION] Impossible to change LCD brightness on Thinkpad R61/T61/X61
https://bugs.launchpad.net/bugs/198476
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