How to install latest upstream kernel on debian testing

First let's add preferences for experimental repository, so it would be used only when specified manually

cat >> /etc/apt/preferences.d/experimental << EOF
Package: *
Pin: release o=Debian,a=experimental
Pin-Priority: 102
EOF

Then lets add an experimental repo to sources list

echo "deb http://ftp.debian.org/debian experimental main contrib \
     non-free" >> /etc/apt/sources.list #chose your mirror

update packages db
```
apt-get update
```
search for kernel of you choice. In my case i wanted linux-image-3.8-trunk-amd64
```
apt-cache search linux-image # find your image
```
i also needed firmware-realtek, firmware-linux-nonfree and intel-microcode for hardware compatibility since i use intel core

than just install every thing from experemental repo

apt-get -t experimental install firmware-linux-nonfree intel-microcode \
     firmware-realtek amd64-microcode linux-image-3.8-trunk-amd64 \

     linux-headers-3.8-trunk-amd64