Intel Ultrabook tweaks on Ubuntu 12.04

After upgrading my Toshiba Z830 Ultrabook to 12.04 (Precise Pangolin) I noticed that the ability to control the screen back-light was not working using the Toshiba Fn F6/F7 keys.

Thanks to the solution was found quite quickly.

sudo vim /etc/default/grub

This will open the grub configuration file. (Grub is the initial boot selection software)
To be able to dim the screen brightness, You’ve got to modify the line:


to these two lines:

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"

Another neat tip: intel-gpu-tools can be used to control brightness from the commandline.

# will set brightness at 50%
intel_backlight 50

EDIT [2012-08-24]: to avoid issues on resume you need to add a script to the

sudo vim /etc/pm/sleep.d/20_wakeup

Add the following:

case "$1" in
#do nothing
echo 7 > /sys/class/backlight/toshiba/brightness
exit 1
exit 0

Mark the file as executable
sudo chmod +x /etc/pm/sleep.d/20_wakeup

Jitsi Ubuntu VoIP SIP Client

The latest instalment in my never-ending quest to find a decent SIP client (see Ubuntu SIP I & Ubuntu SIP II) I came across JITSI ( Since the website looked very interesting and the project seems very well maintained ( I decided to give it a go.

The installation is a breeze with a Ubuntu/Debian package available and the installation also adds the repository to keep the package up to date.

After a few test calls it seems to work very well. The UI is much more intuitive than comparable Ubuntu clients. Looks I found my new default client – nice job Jitsi Team.