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I have a Toshiba portege. Since some time I try to enable the backlit function but without success. I found several posts that should solve it, for example:

Backlight Issue

but it didn't work for me (although now I can set the screen brightness!). I have LTS 12.04. My /etc/rc.local is here:

setpci -s 00:02.0 F4.b=00
exit 0

and my /etc/default/grub here:

GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"

Thank you for your comments and help!

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closed as off-topic by Braiam, Sneetsher, Eric Carvalho, BuZZ-dEE, Radu Rădeanu Jun 10 '14 at 0:06

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This describes a problem that can't be reproduced that seemingly went away on its own or was only relevant to a very specific period of time. It's off-topic as it's unlikely to help future readers." – Braiam, Sneetsher, BuZZ-dEE, Radu Rădeanu
If this question can be reworded to fit the rules in the help center, please edit the question.

maybe this works. It adds a couple things more to you grub file.
The GRUB_CMDLINE_LINUX line should end up like this

GRUB_CMDLINE_LINUX="quiet splash pcie_aspm=force i915.i915_enable_rc6=1 i915.lvds_downclock=1 acpi_osi=Linux acpi_backlight=vendor elevator=noop"

And of course you should run sudo update-grub

Hope it helps.

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hey, sorry for my late reply. I didn't have a look in long time. I tried your suggestion but it didn't work. The worse of all is that now my laptop seems to have problems when waking up after suspend or closing the lid....I will have to solve that one soon, it is really annoying – Lluis Marti Feb 5 '14 at 2:31

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