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Troubleshooting • Re: pi4b selects random HDMI port for output on each reboot

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This has been my experience with the Pi4 as well. That when you reboot, it often comes up trying to write to the wrong monitor. When this happens, I just reboot it again until it comes up right.

Some notes:

1) My overall solution is to reboot the Pi4 as infrequently as possible. My current uptime is about 1 year. Basically, it gets rebooted only when we have a power outage (one long enough that the UPS doesn't cover it).

2) I've noted this behavior on this board on this forum a few times in the past. As expected, it just gets pooh-pooh-d.

3) As one responder says, it does probably have to do with the hotplug detection not working 100% correctly in all cases. In my case, I have a long (25 ft) cable connected to HDMI1 that is currently not plugged into anything at the other end. So the cable is kind of "non-terminated" - maybe that causes it to think there is something there when there isn't. When I did have a monitor connected to that cable, it was a sorta flaky monitor that never really worked 100% correctly and did eventually die (so I unplugged it and threw it away).
Re: 2. In what way is it disregarded? If we cannot replicate a problem here, then it's almost impossible to fix it, and we've never been able to replicate anything like this. Does working through the linked document help in any way?

Re.3 A 25ft HDMI cable is a LONG cable, and you will get signal loss over it, so I would also check with a good quality shorter cable. Since its not plugged in right now though, I would not expect that to be a cause of problems.

Statistics: Posted by jamesh — Mon Jul 01, 2024 10:25 am



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