Hawaii GPU Powerstate Fix for Linux

#!/bin/bash
#This fix works by manually setting the powerstate of the GPU to high/performance. This issue that a lot of AMD users
#have with DPM is that the auto state is broken and an actual fix to dpm does not look likely to happen soon as this
#issue only affect users, using AMD Hawaii GPU's, with the open-source MESA video drivers. So that small group of us
#that are fucked; use this fix.You will want to run this script at boot up everytime. You can run this before or after
#Xorg sessions start; it doesn't matter.
#
# Init
FILE="/tmp/out.$$"
GREP="/bin/grep"
#....
# Make sure only root can run our script
if [ "$(id -u)" != "0" ]; then
   echo "This script must be run as root" 1>&2
   exit 1
fi

#
#AMDGPU Powerstate fix for 390x
#
echo high > /sys/class/drm/card0/device/power_dpm_force_performance_level
echo performance > /sys/class/drm/card0/device/power_dpm_state
#</FIX>

echo "Powerstates changed"
exit