Debian Wheezy use Backports Kernel

Add Backports in File /etc/apt/sources.list.d/debian-backports.list

#deb http://http.debian.net/debian wheezy-backports main contrib non-free
#deb-src http://http.debian.net/debian wheezy-backports main contrib non-free
deb http://ftp.debian.org/debian/ wheezy-backports main contrib non-free
deb-src http://ftp.debian.org/debian/ wheezy-backports main contrib non-free

Upgrade Kernel:

apt-get update
apt-get -t wheezy-backports install linux-base initramfs-tools=0.115~bpo70+1
apt-get -t wheezy-backports install linux-image-3.16.0-0.bpo.4-amd64 linux-headers-3.16.0-0.bpo.4-amd64 firmware-linux firmware-linux-free