#!/bin/bash
# Rename this script to i915.sh and make it executable ( chmod +x i915.sh ) 
#
# This script will load the i915 driver in the 3.2.6 kernel
# for Backtrack 5 R2 without adding unsupported PPA's.
# Adding unsupported PPAs to any Backtrack Distro is considered
# an unacceptable practice that could compromise the stability and 
# more importantly, security of your operating system.

# Script Author: Landon Mayo
# E-Mail landon.mayo[at]OWASP[dot]org
# License: GNU General Public Ver. 2 (the ``GPL``).

# A big thanks goes to James2k for his guide on this:
# Guide URL: backtrack-linux.org/forums/showthread.php?t=48904
# This should get your startx up and running, but you must read his guide
# to ensure everything is running properly.

# changing to grub's directory

cd /etc/default

# backing up orginal grub to grub.bk

cp grub {,.bk}

# Replacing: Orginal String: GRUB_CMDLINE_LINUX_DEFAULT="text splash vga=791"
# With: GRUB_CMDLINE_LINUX_DEFAULT="text i915.i915_enable_rc6=1 i915.lvds_downclock=1 i915.i915_enable_fbc=1 pcie_aspm=force"

sed -i -e 's/"text splash vga=791"/"text i915.i915_enable_rc6=1 i915.lvds_downclock=1 i915.i915_enable_fbc=1 pcie_aspm=force"/g' `find . -iname 'grub'`

# running update-grub to finalize our change
update-grub

# this rc.local startup script runs on next reboot to remove that pesky nouveau driver then load the i915 driver

echo -e "#!/bin/bash\nmodprobe -r nouveau \nmodprobe i915 modeset=1\nexit 0" > /etc/rc.local
chmod +x /etc/rc.local

# Rebooting

shutdown -r now