If you are using UEFI, do not remove the blacklist on samsung-laptop! You are probably safe from the bricking bug with a recent kernel, but there are other UEFI problems with samsung-laptop that have never been resolved, like machine check exceptions.
I did find a way of setting the keyboard backlight without the samsung- laptop module, but I am still working on it. The ACPI DSDT defines a variable KBLL (keyboard back-light level?) in the SNVS (system non-volatile storage). This is where the the backlight level can be stored, but it is highly non-trivial to set. I wrote a program for my own machine, but it has hard-coded memory addresses which probably make it very unwise to run on other systems. A slightly safer way, which requires a reboot to work, is to set the keyboard backlight level in the UEFI variables. On my system: # cd /sys/firmware/efi/efivars # ls *KeyboardBacklight* SecKeyboardBacklightLevel-2f440835-38c4-44b6-b7e4-4f321c8b4189 # xxd -p SecKeyboardBacklightLevel-2f440835-38c4-44b6-b7e4-4f321c8b4189 0700000001 # echo 0700000005 | xxd -p -r > SecKeyboardBacklightLevel-2f440835-38c4-44b6-b7e4-4f321c8b4189 # reboot You can change that last byte from 00 through 06 or so. Don't change the first or other bytes. At some stage during the next boot, it will be read into the KBLL value mentioned above. I use '01' pretty well permanently. Now that recent kernels detect the ambient light properly, it comes on automatically when I need it. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-settings-daemon in Ubuntu. https://bugs.launchpad.net/bugs/1203592 Title: Keyboard backlight does not work in Samsung Series 9 NP900X4C Status in “gnome-settings-daemon” package in Ubuntu: Confirmed Bug description: In Ubuntu 13.04, the keyboard backlight does not work in Samsung Series 9 NP900X4C. Adding the FN key mappings as described in https://help.ubuntu.com/community/SamsungSeries9 does show information in the notification area when pressing the keyboard backlight's + and - buttons, but: 1) The notification always identifies the backlight as "full max" 2) It has no effect on the backlight - it's always off When I first installed Ubuntu on this machine (12.10), even though the fn keys never worked I did have intermitent backlight functionality - the light sensor would sometimes work and I'd see light in the keyboard. I dual boot in Windows 8 and backlighting works there, so this is not a hardware issue. More discussion can be found here: http://askubuntu.com/questions/233312/how-to-make-keyboard-backlight- fn-buttons-work-in-samsung-series-9 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/1203592/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
