Just for completeness, running gnome-power-manager --no-daemon --verbose, I get:
[gpm_brightness_set_hw] gpm-brightness.c:301 (18:00:27): Setting 1 of 7 *** WARNING *** [gpm_brightness_set_hw] gpm-brightness.c:308 (18:00:27): An unknown error occured [gpm_brightness_set_hw] gpm-brightness.c:301 (18:00:27): Setting 2 of 7 *** WARNING *** [gpm_brightness_set_hw] gpm-brightness.c:308 (18:00:27): An unknown error occured [gpm_brightness_set_hw] gpm-brightness.c:301 (18:00:27): Setting 3 of 7 *** WARNING *** [gpm_brightness_set_hw] gpm-brightness.c:308 (18:00:27): An unknown error occured [gpm_brightness_set_hw] gpm-brightness.c:301 (18:00:27): Setting 4 of 7 *** WARNING *** [gpm_brightness_set_hw] gpm-brightness.c:308 (18:00:27): An unknown error occured [gpm_brightness_set_hw] gpm-brightness.c:301 (18:00:27): Setting 5 of 7 *** WARNING *** [gpm_brightness_set_hw] gpm-brightness.c:308 (18:00:27): An unknown error occured [gpm_brightness_set_hw] gpm-brightness.c:301 (18:00:27): Setting 6 of 7 *** WARNING *** [gpm_brightness_set_hw] gpm-brightness.c:308 (18:00:27): An unknown error occured [gpm_brightness_set_hw] gpm-brightness.c:301 (18:00:27): Setting 7 of 7 *** WARNING *** [gpm_brightness_set_hw] gpm-brightness.c:308 (18:00:27): An unknown error occured -- doesn't dim screen on sony vaio vgn fs215m (regression) https://launchpad.net/bugs/65028 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs