Toshiba Satellite U940-101 keyboard backlight does not work

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Toshiba Satellite U940-101 keyboard backlight does not work

Postby Staedie on Fri Jan 18, 2013 1:10 pm

As the subject says, I have a Toshiba Satellite U940-101 and my keyboard backlight does not work with Linux. I am using Linux Mint 14 Cinnamon 64bit. On my laptop, Windows 8 was pre-installed and I can start Linux only by switching off the UEFI option and the secure boot option in Bios. The backlight works while I am in the Bios (version 1.30) and in Windows, but it turns off as soon as I boot Linux, just after the Toshiba booting symbol disappears.

In other forums I have read that switching off ACPI in Bios could help in making the backlights work in Linux, but apart from the fact that this would turn off other important functions, my Bios does not even provide the option of turning on/off ACPI.

I have already tried another Linux distro (Fedora 17), but there I have the same issue with the backlights. I have also installed all the drivers I could find for my Toshiba Satellite, both from the Toshiba website and the Linux (Mint) compatibility drivers from the software manager.

Could it be a kernel problem which is not solved / updateable yet?

I am a beginner in Linux and would be thankful for every hint.
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Re: Toshiba Satellite U940-101 keyboard backlight does not w

Postby linucksrox on Sun Jan 20, 2013 10:51 pm

I wonder if it's the same issue I recently had with my Acer laptop. I added acpi_backlight=vendor to the grub entry which allowed the backlight hotkeys to function properly. Follow the steps in this post to see if that helps you. Don't forget (like I did) to run sudo update-grub to actually write the changes to the bootloader after editing /etc/default/grub.
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Re: Toshiba Satellite U940-101 keyboard backlight does not w

Postby Staedie on Mon Jan 21, 2013 2:47 pm

Thanks for your reply!

What I actually meant was not the function on the keyboard to regulate the backlight of the screen, but the lights of the keyboard itself, the small lights under each keyboard button. These don't work. By pressing "FN + Y", the combination with which I normally can turn on/off those lights, there appears a symbol on the screen for one second that refers clearly to this function, as if I really could turn the lights on or off, but it doesn't change anything on the concrete keyboard backlights themselves. They stay off. So I don't know.

Does anybody else have any ideas?
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