HDMI connected screen repeats to turning backlight on when monitor goes to sleep

Technical Support
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4

Hi @rolando5005 !

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By using Torizon Cloud it is quite easy to deploy new version of OS and/or your application on the field with security and robustness.

If you have interest, you can try it for free. Just check the torizon.io website :wink:

Regarding the HDMI display, since you are using the native HDMI, isn’t it possible that you should control the card0-HDMI-A-2 instead of card0-HDMI-A-1?

You can actually check which HDMI output you are using before manipulating its status:

torizon@verdin-imx8mp-15247228:~$ cat /sys/class/drm/card0-HDMI-A-1/status
disconnected
torizon@verdin-imx8mp-15247228:~$ cat /sys/class/drm/card0-HDMI-A-2/status
connected

When connecting the HDMI monitor to the native HDMI of Verdin iMX8MP on Dahlia, card0-HDMI-A-2 became connected instead of card0-HDMI-A-1. So echoing off to card0-HDMI-A-2’s status disabled the display. I could wait several minutes and the HDMI monitor never activated itself. It only became active after echoing on to card0-HDMI-A-2’s status.

So I could not reproduce the behavior your are facing.

Here are the details of my setup:

  • module Verdin iMX8MP Q 4GB WB IT V1.1A
  • Toradex carrier board Dahlia V1.1C
  • Torizon OS 6.7.0-build.18 (quarterly)
  • HDMI monitor LG FLATRON 32UL750-W

Best regards,