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.
Sorry for the extra emails, but I think I found the problem:
Version 2.27.2 eliminated keyboard backlight brightness support: git.gnome. org/cgit/ gnome-power- manager/ commit/ ?id=c8a560caf48 8129c03a4e437ff 7bd54f173c2f55
http://
"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.