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I have a Samsung Series 7 Chronos (700Z5C-S02UB) and a couple of kernel updates ago (I'm currently on 3.5.0-25-generic ), I lost the keyboard backlight support.
Any idea on how to turn it back on?

NOTE: I've already had samsung-tools, I've re-installed but still doesn't work

EDIT: I manage to get it working (somehow). What I found is: the ambient light autodetect works, but it seems to be unable to control the level of brightness. If I boot windows and set it to high, it works in Ubuntu (it might be just a coincidence tho)

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1 Answer 1

Is there a /sys/class/leds/samsung::kbd_backlight?

If so, try

echo 3 > /sys/class/leds/samsung\:\:kbd_backlight/brightness

It could be any number between 0 and 8 indicating the level of brightness of the keyboard backlight.

Otherwise, try this:

sudo add-apt-repository ppa:voria/ppa
sudo apt-get update
sudo apt-get install samsung-tools samsung-laptop

Reboot, then

echo 8 > /sys/devices/platform/samsung/leds/samsung\:\:kbd_backlight/brightness
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nope, I have /sys/class/leds/phy0-led . Not really sure to what device it belongs, but trying to set it didn't do anything either –  GClaramunt Mar 7 '13 at 12:58
    
okay, try the second method. –  darksky Mar 8 '13 at 6:57
    
no luck either :( –  GClaramunt Mar 8 '13 at 13:44
    
I think you may need to do this. Try opening /etc/default/grub and change GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor" save. Run in terminal sudo update-grub and restart. –  darksky Mar 8 '13 at 15:07
    
Ok, now is working, but I have only "quiet splash acpi_osi=Linux " I have a theory, tomorrow I'll test it. Thanks a lot for your ideas! –  GClaramunt Mar 9 '13 at 3:24

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