Comment 8 for bug 390669

Sorry for the extra emails, but I think I found the problem:

Version 2.27.2 eliminated keyboard backlight brightness support:
http://git.gnome.org/cgit/gnome-power-manager/commit/?id=c8a560caf488129c03a4e437ff7bd54f173c2f55
"Remove ambient light sensor support, and keyboard backlight devices"

brightness_kbd_changed_cb is no longer a function in GPM.

Next step: refresh the above patch (comment 6) for 2.27.2 and remove the final hunk.