http://serverphorums2.rssing.com/browser.php?indx=20361555&item=4129
http://ubuntuhandbook.org/index.php/2014/08/install-upgrade-linux-kernel-3-16/
Simply, update your kernel up to 3.16
2. For 64-bit system:
cd /tmp/ wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.16-utopic/linux-headers-3.16.0-031600-generic_3.16.0-031600.201408031935_amd64.deb wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.16-utopic/linux-headers-3.16.0-031600_3.16.0-031600.201408031935_all.deb wget http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.16-utopic/linux-image-3.16.0-031600-generic_3.16.0-031600.201408031935_amd64.deb sudo dpkg -i linux-headers-3.16.0-*.deb linux-image-3.16.0-*.deb
Reboot and done.
If for some reason this kernel release doesn’t work properly for you, reboot into previous kernel (Grub -> Advanced -> select previous kernel) and run this command to remove Linux Kernel 3.16:
sudo apt-get remove linux-headers-3.16.0-* linux-image-3.16.0-*
Finally update grub menu:
sudo update-grub
*********** might be useful for realtek rtl8723bs module ************
http://ubuntuforums.org/showthread.php?t=2249936
