Red Hat Bugzilla – Bug 503220
Unable to dim backlight
Last modified: 2010-06-28 08:45:12 EDT
Description of problem:
Upgraded from F10 to F11 (prerelease) and now am unable to dim the backlight. The screen brightness is stuck at 100% all the time whether on AC or battery power. This is a regression from F10 where the keys to dim the screen worked.
Running lshal -m, it appears that something is correctly registering the key presses:
10:38:28.451: platform_i8042_i8042_KBD_port_logicaldev_input condition ButtonPressed = brightness-up
10:38:29.638: platform_i8042_i8042_KBD_port_logicaldev_input condition ButtonPressed = brightness-down
Running xbacklight to force the brightness also fails:
$ xbacklight -set 50
No outputs have backlight property
I'm not sure if this is a problem with the power management subsystem or with the X driver.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Press Fn-Up or Fn-Down to change brightness. Or ...
2. Run xbacklight with either -set or -dec. Even xbacklight -get fails.
xbacklight errors with 'No outputs have backlight property'.
Screen to dim.
DeviceKit-power doesn't do anything with the backlight device... You need to be running gnome-power-manager or another session policy agent for the changes to be made. If you're running gnome-power-manager, please re-open this bug and attach the output of gnome-power-bugreport.sh. Thanks.
I am running gnome-power-manager. This is a Samsung n110. As I mentioned previously, I was able to control the screen brightness under F10.
Output from gnome-power-bugreport.sh below. Please reopen this bug. Thank you.
Distro version: Fedora release 11 (Leonidas)
Kernel version: 18.104.22.168-167.fc11.i586
g-p-m version: 2.26.1
HAL version: 0.5.12
System manufacturer: missing
System version: missing
System product: missing
AC adapter present: yes
Battery present: yes
Laptop panel present: no
CPU scaling present: yes
battery.charge_level.current = 28144 (0x6df0) (int)
battery.charge_level.design = 66209 (0x102a1) (int)
battery.charge_level.last_full = 63965 (0xf9dd) (int)
battery.charge_level.percentage = 43 (0x2b) (int)
battery.charge_level.rate = 12591 (0x312f) (int)
battery.is_rechargeable = true (bool)
battery.model = '' (string)
battery.present = true (bool)
battery.rechargeable.is_charging = false (bool)
battery.rechargeable.is_discharging = true (bool)
battery.remaining_time = 8046 (0x1f6e) (int)
battery.reporting.current = 2508 (0x9cc) (int)
battery.reporting.design = 5900 (0x170c) (int)
battery.reporting.last_full = 5700 (0x1644) (int)
battery.reporting.rate = 1122 (0x462) (int)
battery.reporting.technology = 'Li-ion' (string)
battery.reporting.unit = 'mAh' (string)
battery.serial = '' (string)
battery.technology = 'lithium-ion' (string)
battery.type = 'primary' (string)
battery.vendor = 'SAMSUNG Electronics' (string)
battery.voltage.current = 11222 (0x2bd6) (int)
battery.voltage.design = 11340 (0x2c4c) (int)
battery.voltage.unit = 'mV' (string)
GNOME Power Manager Process Information:
stephenf 2114 0.0 0.7 119660 15564 ? Sl May29 0:14 \_ gnome-power-manager
HAL Process Information:
68 1487 0.0 0.2 7164 4884 ? Ss May29 0:06 hald
root 1491 0.0 0.0 3444 1092 ? S May29 0:00 \_ hald-runner
root 1581 0.0 0.0 3512 1016 ? S May29 0:02 \_ hald-addon-input: Listening on /dev/input/event9 /dev/input/event3 /dev/input/event2 /dev/input/event6 /dev/input/event0 /dev/input/event1 /dev/input/event5
root 1612 0.0 0.0 3524 992 ? S May29 0:00 \_ /usr/libexec/hald-addon-cpufreq
68 1616 0.0 0.0 3180 972 ? S May29 0:00 \_ hald-addon-acpi: listening on acpid socket /var/run/acpid.socket
Forgot to reopen bug. Status now 'assigned'.
This bug appears to have been reported against 'rawhide' during the Fedora 11 development cycle.
Changing version to '11'.
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