Hauppague does not provide Linux drivers for the WinTV-HVR 950. You will need to use the experimental Linux drivers from LinuxTV. To condense the installation instructions from LinuxTV, install the firmware and driver support for the device, this procedure should work.
Open a Terminal session with Cntl-Alt-F1. Enter the following:
unzip -j HVR-12x0-14x0-17x0_1_25_25271_WHQL.zip Driver85/hcw85bda.sys
cp xc3028-v27.fw /lib/firmware
tar xvjf linux-media-2014-03-14-ed97a6f.tar.bz2
sudo make install
You will probably have to do a system restart for the firmware and driver to fully load.
As this is an experimental third-party driver, there is no support other than through LinuxTV and there is no guarantee that this will work with your system.