Tuesday, November 4, 2014

Raspberry Pi, kill the tvservice if you are not using HDMI

I'm running a Raspberry Pi at home for various tasks and access it remotely using SSH for all maintanence tasks. This means that the HDMI control in the Pi is unused and hence can be switched off for maybe not better performance, but at least for a lower working temperature.

When logged in, you can switch the HDMI off by running
tvservice -o

However, this will reset at boot time. So one way to handle this is to simply add the command to the boot scripts.

I did it the quick way by adding the command to the boot sequence:
vi /etc/init.d/customboot.sh

# Provides:          customboot
# Required-Start:    networking
# Required-Stop:     networking
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Custom boot commands
# Description:       Custom boot commands

echo "Turning off tvservice"
/opt/vc/bin/tvservice -o

Then add permissions and add the script to the boot sequence
sudo chmod +x /etc/init.d/customboot.sh
sudo update-rc.d customboot.sh defaults

By doing this, I lowered the idle temperature of my Pi with about two degrees C:

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