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I have read on this blog that you can reduce power consumption:

https://www.jeffgeerling.com/blogs/jeff-geerling/raspberry-pi-zero-conserve-energy

By disabling the HDMI port.

He says that I should add this line:

/usr/bin/tvservice -o

to /etc/rc.local

But I don't know where and how, my /etc/rc.local file is like this:

_IP= || true
if [ "" ]; then
  printf "My IP address is %s\n" ""
fi

# disable console blanking on PiTFT
sudo sh -c "TERM=linux setterm -blank 0 >/dev/tty0"





exit 0

Where to add this line, and would it work?

  • Try adding t after sudo sh -c "TERM=linux setterm -blank 0 >/dev/tty0" and before exit 0 – Steve Robillard Jul 3 '17 at 17:20
  • @SteveRobillard should I just add it like that, or should I add sudo prefix before it as well? – AmateurElectronics Jul 3 '17 at 17:21
  • did the tutorial have sudo? if not then no. – Steve Robillard Jul 3 '17 at 17:22
  • The sudo in the previous line is also redundant - /etc/rc.local is executed by/as root (or possibly the kernel) before other users are even considered... OTOH /etc/local is an SysV init thing - does it still get considered/run if systemd is run as the first process as "Jessie" and later ("Stretch" is out on Debian has it made it to Raspbian yet?) uses that by default - although if you are a SysV init hold-out like me you may not know/care...! 8-) – SlySven Jul 7 '17 at 0:48
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You need to add:

/usr/bin/tvservice -o

between these two lines:

sudo sh -c "TERM=linux setterm -blank 0 >/dev/tty0"

exit 0

To reenable HDMI change this line:

/usr/bin/tvservice -o

to

/usr/bin/tvservice -p

Note: for these lines to take effect will require a reboot.

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