Public bug reported: I can change the brightness using this command:
sudo bash -c 'echo 128 >/sys/class/backlight/kb3886-bl/brightness' i.e. by writing values in the range 0..255 into /sys/class/backlight/kb3886-bl/brightness but changing it with xbacklight, e.g. with sudo xbacklight -set 50 does not work. This is how hal reports about the backlight driver (full lshal output attached): udi = '/org/freedesktop/Hal/devices/computer_backlight' info.addons = {'hald-addon-generic-backlight'} (string list) info.capabilities = {'laptop_panel'} (string list) info.category = 'laptop_panel' (string) info.interfaces = {'org.freedesktop.Hal.Device.LaptopPanel'} (string list) info.parent = '/org/freedesktop/Hal/devices/computer' (string) info.product = 'Generic Backlight Device' (string) info.subsystem = 'backlight' (string) info.udi = '/org/freedesktop/Hal/devices/computer_backlight' (string) laptop_panel.access_method = 'general' (string) laptop_panel.num_levels = 256 (0x100) (int) linux.hotplug_type = 2 (0x2) (int) linux.subsystem = 'backlight' (string) linux.sysfs_path = '/sys/devices/platform/kb3886-bl/backlight/kb3886-bl' (string) udi = '/org/freedesktop/Hal/devices/platform_kb3886_bl' info.linux.driver = 'kb3886-bl' (string) info.parent = '/org/freedesktop/Hal/devices/computer' (string) info.product = 'Platform Device (kb3886-bl)' (string) info.subsystem = 'platform' (string) info.udi = '/org/freedesktop/Hal/devices/platform_kb3886_bl' (string) linux.hotplug_type = 2 (0x2) (int) linux.subsystem = 'platform' (string) linux.sysfs_path = '/sys/devices/platform/kb3886-bl' (string) platform.id = 'kb3886-bl' (string) $ lsb_release -rd Description: Ubuntu jaunty (development branch) Release: 9.04 $ apt-cache policy xbacklight linux xbacklight: Installed: 1.1-1 Candidate: 1.1-1 Version table: *** 1.1-1 0 500 http://ch.archive.ubuntu.com jaunty/universe Packages 100 /var/lib/dpkg/status linux: Installed: 2.6.28.8.8 Candidate: 2.6.28.8.8 Version table: *** 2.6.28.8.8 0 500 http://ch.archive.ubuntu.com jaunty/restricted Packages 100 /var/lib/dpkg/status ** Affects: xbacklight (Ubuntu) Importance: Undecided Status: New -- Unable to adjust of brightness on Tabletkiosk Sahara TouchIT-213 Tablet PC https://bugs.launchpad.net/bugs/338733 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs