I made it by using GPIO 3 (Pin 5) and it's opposite Ground Pin 6. Read my thread: Support for the Pi-Desktop Power Button?
If your board must use GPIO 3 and GPIO 17, you can set GPIO 17 to Low (Ground) in the python script ("off-button.py", see link above).
Insert this lines after line 8 of "off-button.py":
ground_pin_number=17
GPIO.setup(ground_pin_number, GPIO.OUT)
GPIO.output(ground_pin_number, False)I have found a hot fix for this bug, but it's ugly. 
The problem is that it always boots in VGA mode after a DVI session. Later on boot process - if you are lucky - it will switch to the selected user HDMI resolution. I think the initial VGA mode is the reason for a bad detection of HDMI modes. Not all possible TV resolutions and/or refresh rates will be found.
A "Soft Reset" or a "Hard Reset" made from the system settings menu will not solve problem - initial VGA mode will stay.
The only solution for me was to rewrite my MicroSD card with a new LibreELEC image. That will make the initial HDMI boot resolution (720p / 50Hz) work again. All possible TV resolutions and refresh rates will be found, too.
Maybe somebody should report this as an official bug.
I had a resolution problem too after using LibreELEC at Raspberry Pi (3B+) for some tests on a DVI monitor. noemin, which hardware do you use?
After a DVI session it had problems to use the (previously found and used) HDMI resolutions. The Raspberry Pi was booting in VGA mode on my HDMI TV. Some reboots, resolution changes and firmware updates (not sure what it was) solved the problem. Now the HDMI resolutions of the TV are detected right again, and it starts with the selected mode.
I think it's a bug on LibreELEC. It doesn't detect the proper resolutions when changing from DVI back to HDMI.
Success! GPIO3 power on/off triggers the expected results now! 
Thank you very much, Iridium!
I can use a cheap case now, and install my own power button - problem solved.
Still an error at line 6:
File "/storage/scripts/off-button.py", line 6
import sys.path.append('/storage/.kodi/addons/virtual.rpi-tools/lib')
^
SyntaxError: invalid syntaxThis might also help
I followed those instructions and did that:
- set config.txt back to original (no "dtoverlay=gpio-shutdown")
- installed "Raspberry Pi Tools" from repository
- created the "autostart.sh" and "off-button.py"
- set both files as executable (chmod +x)
GPIO3 now still works as power on (it always does), but the next trigger to power off does nothing.
The python script ("off-button.py") looks OK:
- the necessary lib from "Raspberry Pi Tools" exists (/storage/.kodi/addons/virtual.rpi-tools/lib/GPIO.so)
- the pin mode "GPIO.BCM" is correct for my model 3b+ with GPIO3 power button
Any hints?
PS: The command line response when starting from ssh ("sh /storage/.config/autostart.sh") is this:
Traceback (most recent call last):
File "/storage/scripts/off-button.py", line 6, in <module>
import syss
ImportError: No module named syssYou could try This to power on/off your device
I have been tried this, and it partially works. (edit config.txt, shortcut GPIO 3 and GND as power button)
The power on works fine.
The power off will let the shutdown menu appear (power off, power off timer, reboot).
Do you know a trick how to avoid that menu and instantly power off?
The Raspberry Pi has an internal Bluetooth interface. Having an additional BT dongle connected can lead to device management chaos. Try to use the internal BT interface only.
Hello community,
the Raspberry Pi (model 3B+) is an always-on board by design - it has no power button. This will make LE sending a permanent video signal to my TV. When I turn the TV on, it will instantly switch to the active video signal input (LE), and doesn't stay in TV mode. This is bad, and I want to find a solution.
The first idea was to temporary switch off the HDMI signal by the command "tvservice -o". Unfortunately the command to switch HDMI on again "tvservice -p" doesn't work on LE.
The next idea is to put the Raspberry Pi in a case with a power button. I have found the Pi-Desktop case by Element14 on the market. To make the power button work, it needs an additional Debian package "pidesktop-base.deb". The source code for this package is available on Github.
Is there any add-on or another solution to make the Pi-Desktop power button work on LE?
PS: I have been found this thread, which is still unsolved and has a "maybe too old" warning. If someone made it work from there, please give me a notice.
it's ZTE ZXV10 B700V5
i was try to install libreELEC but still failed.
please help
You have been realized, that your device is not on the list of supported devices, right?
Thanx vpeter. I have been tried this commands from your link:
vcgencmd display_power 0
vcgencmd display_power 1Those commands work, but the first command only turns the screen black, and does not switch the HDMI video signal off.
The problem behind my question is this: If I turn the TV on, it automatically switches to the active video input signal, and does not stay in TV mode. I want to avoid that behavior by switching the LibreELEC video signal off temporary.
(If I can't solve it, I have to buy a case with a power button, but to make the power button work, LibreELEC needs additional software - maybe a problem.)
You have to check if LibreELEC runs on your hardware. Go to this page:
Open the list box under the headline "DIRECT DOWNLOADS". Check if your hardware is on the list.
Hello, I'm a new user!
My hardware: Raspberry Pi 3b+
My software: LibreELEC, latest Milhouse build
I would like to switch the HDMI video signal off and on by using commands. For testing, I did those commands over SSH terminal:
HDMI video off: tvservice -o -> WORKS
HDMI video on: tvservice -p -> DOESN'T WORKS
What are the right commands to switch the HDMI video signal off and on?