Comment 34 for bug 555122

Same problem here with an HP 6735s, not solved by the fix suggested by Silvan. When I hit Fn+F7/F8 I get the brightness OSD displayed once (display unaffected) and then nothing on further button presses.

killall gnome-power-manager && gnome-power-manager --verbose

Fn+f8 gives;

TI:14:23:59 TH:0x226c4f0 FI:gpm-button.c FN:gpm_button_filter_x_events,121
 - Key 233 mapped to key brightness-up
TI:14:23:59 TH:0x226c4f0 FI:gpm-button.c FN:gpm_button_emit_type,81
 - emitting button-pressed : brightness-up
TI:14:23:59 TH:0x226c4f0 FI:gpm-manager.c FN:gpm_manager_button_pressed_cb,914
 - Button press event type=brightness-up
TI:14:23:59 TH:0x226c4f0 FI:gpm-backlight.c FN:gpm_backlight_button_pressed_cb,451
 - Button press event type=brightness-up
TI:14:23:59 TH:0x226c4f0 FI:gpm-brightness.c FN:gpm_brightness_trust_cache,107
 - using cache for value 100 (probably okay)
TI:14:23:59 TH:0x226c4f0 FI:gpm-brightness.c FN:gpm_brightness_up,257
 - no hardware support

Fn+f7 gives;

TI:14:26:15 TH:0x72b4f0 FI:gpm-button.c FN:gpm_button_filter_x_events,121
 - Key 232 mapped to key brightness-down
TI:14:26:15 TH:0x72b4f0 FI:gpm-button.c FN:gpm_button_emit_type,81
 - emitting button-pressed : brightness-down
TI:14:26:15 TH:0x72b4f0 FI:gpm-manager.c FN:gpm_manager_button_pressed_cb,914
 - Button press event type=brightness-down
TI:14:26:15 TH:0x72b4f0 FI:gpm-backlight.c FN:gpm_backlight_button_pressed_cb,451
 - Button press event type=brightness-down
TI:14:26:15 TH:0x72b4f0 FI:gpm-brightness.c FN:gpm_brightness_trust_cache,107
 - using cache for value 100 (probably okay)
TI:14:26:15 TH:0x72b4f0 FI:gpm-brightness.c FN:gpm_brightness_down,301
 - no hardware support