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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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1 Answer

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 at 2:31
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