Samsung NP900X4C Ubuntu 14.04

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First I turned off Secure boot and UEFI, so it wouldn't brick my laptop, but that should be fixed in latest kernels. Installed Ubuntu 14.04 64bit. Almost everything works.

1) Fn-keys
Get the Fn-keys to work: 
sudo apt-add-repository ppa:voria/ppa
sudo apt-get update
sudo apt-get install samsung-tools xbindkeys-config
Then I run:
samsung-tools-preferences
 2) My USB 3.0 ports didn't work. So I fixed it by editing /etc/default/grub 
sudo gedit /etc/default/grub
Change line 
GRUB_CMD_LINUX_DEFAULT="quiet splash i915.i915_enable_rc6=1 i915.i915_enable_fbc=1

i915.lvds_downclock=1 pciehp.pciehp_force=1samsung-tools-preferences
pciehp command makes usb ports work, and i915 stuff downclocks the graphics so it would take less energy.

3) Brightness - On startup brightness is full, and is so brighter than sun. I fixed it by installing a program and running a command on startup.

sudo apt-get install xbacklight
Run Startup Applications and create new application:
Name: Brightness
Command: xbacklight -set 25
4) Tweaks for SSD:
Swappiness:
sudo gedit /etc/sysctl.conf
Added line:
vm.swappiness=0


Ramdisk:
sudo gedit /etc/fstab
Added line:
none /tmp tmpfs defaults 0 0


Disk scheduler:
sudo gedit /etc/rc.local
Added line:
echo deadline >/sys/block/sda/queue/scheduler
 
5) Battery life extender - So the laptop would only charge to 80% battery and save battery by doing that.
sudo gedit /etc/rc.local
Added line:
echo 1 > /sys/devices/platform/samsung/battery_life_extender

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