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
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 _set_hw] gpm-brightness. c:308 (18:00:27): An unknown error occured _set_hw] gpm-brightness. c:301 (18:00:27): Setting 2 of 7 _set_hw] gpm-brightness. c:308 (18:00:27): An unknown error occured _set_hw] gpm-brightness. c:301 (18:00:27): Setting 3 of 7 _set_hw] gpm-brightness. c:308 (18:00:27): An unknown error occured _set_hw] gpm-brightness. c:301 (18:00:27): Setting 4 of 7 _set_hw] gpm-brightness. c:308 (18:00:27): An unknown error occured _set_hw] gpm-brightness. c:301 (18:00:27): Setting 5 of 7 _set_hw] gpm-brightness. c:308 (18:00:27): An unknown error occured _set_hw] gpm-brightness. c:301 (18:00:27): Setting 6 of 7 _set_hw] gpm-brightness. c:308 (18:00:27): An unknown error occured _set_hw] gpm-brightness. c:301 (18:00:27): Setting 7 of 7 _set_hw] gpm-brightness. c:308 (18:00:27): An unknown error occured
*** WARNING ***
[gpm_brightness
[gpm_brightness
*** WARNING ***
[gpm_brightness
[gpm_brightness
*** WARNING ***
[gpm_brightness
[gpm_brightness
*** WARNING ***
[gpm_brightness
[gpm_brightness
*** WARNING ***
[gpm_brightness
[gpm_brightness
*** WARNING ***
[gpm_brightness
[gpm_brightness
*** WARNING ***
[gpm_brightness