Same problem here on my R61. Brightness stopped working after a Hardy
upgrade a few days ago.

Also, when I press the brightness keys there is a 3 second delay before
the indicator pops up - the level bar goes up and down but the
brightness does not change.

Whenever I press the brightness keys I get the following in the ring
buffer:

[  707.516717] thinkpad_acpi: unknown LID-related HKEY event: 0x5010
[  710.394765] thinkpad_acpi: unknown LID-related HKEY event: 0x5010
[  710.508695] thinkpad_acpi: unknown LID-related HKEY event: 0x5010

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Backlight adjustment no longer works on Thinkpad X61s
https://bugs.launchpad.net/bugs/197929
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