turning on and off display to save power
March 16, 2024, 23:59
i bought this and it works
https://www.amazon.com/gp/product/B07RT7MK7C/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1#customerReviews
i bought
https://www.amazon.com/gp/product/B0C3V7TCG8/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1
im using dakboard on a rasp pi 4
i have tried everything i can find online but i cannot get it to work properly to turn the display on and off does anyone have experience i can get it to read motion with this guide but i cant get it to actually turn off and on the screen
https://www.thedigitalpictureframe.com/pir-motion-sensor-raspberry-pi-digital-picture-frame/
is the display gpio powered?
also please don't cross post. I shall also change your title so it will describe your issue better since your not having issues with the sensor but the display
No it's HDMI with a separate power source
then you need a way to control that seperate power source
can it be powered via the pis usb?
yeah but when i plug in the usb for the touch functionality it wont work if i power by the pi. but it does turn the screen on and boot to dakboard
oh
then however you power it you need to be able to control that from the pi
maybe some switch plug with Bluetooth?
i was able to get it to power from the pi and touch works
great
<@&818389709134626826> how can we switch off a usb on the pi at will?
It's tied to the 5v bus isn't it?
no clue
it would be switching off the hdmi on and off depending on motion its a argon case with the full size hdmi ports
Test:
vcgencmd display_power 0
or
echo 'standby 0' | cec-client -s -d 1 # Needs the pkg cec-utils
Check this link for more info: https://raspberrypi.stackexchange.com/questions/145461/turn-off-hdmi-rpi-4b-bookworm
i just keep getting unable to open display
in that link is the board
Please remove the stuff after the "?" when you post links
that's just a load of tracking stuff
try that
i guess its not that big of a issue ill just have dakboard change photos every few mins to avoid burnout
After reading the source code (https://github.com/raspberrypi/utils/blob/master/vcgencmd/vcgencmd.1)
vcgencmd display_power 0 7
Will turn off power to display ID 7, which is HDMI 1 on a Raspberry Pi 4.
You could also test kmsblank and the commands kmsprint and kmstest will show what displays that is connected
i plugged it into a rpi 3 using the same sd card and i still get the unable to open display error
Hello people who discussed @here. On bookworm when using kms "vcgencmd display_power 0" does not work but with fkms it does. Is there any workarounds to make it work with kms?
Also what would be impact of changing from kms to fkms? I am using rpi with wayfire to display webpages in chromium and videos.