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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 can't be turn on in Acer Aspire 4736

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_DEFAULT=0
GRUB_HIDDEN_TIMEOUT=0
GRUB_HIDDEN_TIMEOUT_QUIET=true
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux acpi_backlight=vendor"
GRUB_CMDLINE_LINUX="acpi_osi=Linux"

Thank you for your comments and help!

Community
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Lluis Marti
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1 Answers1

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maybe this works. It adds a couple things more to you grub file.
http://www.gaggl.com/2012/05/intel-ultrabook-tweaks-on-ubuntu-12-04/
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.

Este
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