I confirm this bug on my thinkpad T510.
A workaround is to change brightness in text-mode VT (ie. crtl+alt+f1, change 
brightness, ctrl+alt+f7 to switch back to X.)

The lack of OSD is a new development since 26/02, I think it requires a
separate bug report.

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g-p-m's brightness control doesn't work on Thinkpad T60
https://bugs.launchpad.net/bugs/527436
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