LCD brightness control not working (Toshiba Satellite A110)

[Alex N]

Toshiba Satellite A110
Ubuntu Desktop 9.04, kernel 2.6.28-14-generic
GNOME Power Manager 2.24.2
Hardware Abstraction Layer 0.5.12
D-Bus 1.2.12

Trying to change LCD backlight brightness through GNOME Power Manager, GNOME Power Manager Brightness Applet and xbacklight - changes appeared only in /sys/class/backlight/acpi_video0/brightness and /proc/acpi/video/GFX0/LCD/brightness, but actually brightness of the LCD backlight didn't change.

Trying to do it manually...
sudo su
echo -n 0 /sys/class/backlight/acpi_video0/brightness
echo -n 5 /sys/class/backlight/acpi_video0/brightness
echo -n 0 /proc/acpi/video/GFX0/LCD/brightness
echo -n 100 /proc/acpi/video/GFX0/LCD/brightness
Also not working.

Functional keys combination (Fn+F6 & Fn+F7) always work properly and change the brightness level of the LCD backlight (in all OSs and even if no OS is loaded).

[Steve Langasek (vorlon)]

This is not a bug in acpi-support. Do not reassign it back. It is either a bug in gnome-power-manager, devicekit-power, or the kernel.

[Pedro Villavicencio (pedro)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. A new version of GNOME Power Manager is available on Maverick and we are wondering if this bug is still an issue for you with that version? Could you please test and comment back? Thanks in advance.

[Launchpad Janitor (janitor)]

[Expired for gnome-power-manager (Ubuntu) because there has been no activity for 60 days.]

[micha (andreev-micha)]

Hi,
it looks that i have the same problem on toshiba laptop with fresh ubuntu 11.04:
there are notifications of brightness change in notification area and values in /proc/acpi/toshiba/lcd are changed when pressing Fn+F6 & Fn+F7, but actual brightness remains the same.

[micha (andreev-micha)]

Nevermind, the lcd brightness fixed itself after few reboots