Raspberry Pi OS • Re: Pi5 screen blanker?

...

I take it back. It worked on one of my Pi5s. The other one blanks but unblanks 2 seconds later. ...

This is probably caused by the monitor deasserting the HDMI hotplug detect pin when it goes into standby, then reasserting it again shortly thereafter. This is a known problem with some monitors - they're not meant to do that. You can work around this by forcing the video driver to pretent it is permanently asserted: add the following to the kernel command line (/boot/firmware/cmdline.txt):
For HDMI 0 (the one next to the USB-C power input).
For HDMI 1, and
for both. Each of these will also cause the Pi to ignore any real unplug / plug events on the specified HDMI connector(s).

Statistics: Posted by andrum99 — Sat Apr 05, 2025 3:44 pm

---