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Pi video changes

colporteur

G'Day,

Using a HDMI to DVI input cable, Pi video is now displayed on my ASUS VB197 19" LCD display monitor and my ViewSonic VP171s. I tried both monitors a year ago and they failed to work. I assume something changed but can't find any details.

 

I had cause to run a test this week using the monitors believing from past results they wouldn't work. I was thinking of maybe modifying some of the parameters I stumbled across in /boot/config.txt  for HDMI to see if that would make a difference.

 

Now that the monitors are working, I'm thinking did I have a "shower scene" with the monitors, like Bobby Ewing had on the drama series Dallas in the 1980. Bobby characters was killed off because the actor left the show. A year later after a complete season had finished, he comes back (same actor returned) waking up in a shower. The whole past season was written off as a dream.

 

I'm curious if someone is aware of Pi HDMI changes that would cause monitors that didn't work a year ago, to suddenly work today. Now that I think about it. A year ago I was using Pi 3 and now I'm using Pi3B+. Maybe that is the change. I need to pull out an old Pi and see what is up.

 

Sean

  • Hmm a puzzle indeed. Did you try the old Pi 3?

  • in reply to clem57

    I must have gotten detracted and failed to come back to this post and provide an update. I recall pulling out some old monitors and performing some tests. I'm not sure what I discovered. Things working that didn't work before seems to be a memory.

     

    I'm no where near my lab at the moment to check. I won't be for the next few weeks to follow up. Thanks for the question. I'm going to leave your message in my inbox to remind me to respond. I try hard to keep incomplete posts to minimum. Looks like this one slipped through the cracks.

     

    Sean

  • Thanks to image inquiry I was motivated (i.e. reminded) to determine the status of video output on the Pi's. I did do it when I first asked the question but didn't document my results and make a post. Here is to answering your own question.

     

    I can report that all the Pi's I tried displayed video.

     

    Test Condition

    Monitor: ViewSonic VP171s

    Connection: DVI-D to HDMI (See drawing)

    image

    O/S: 2019-07-10-raspbian-buster-full

    Hardware: Raspberry Pi1B, Raspberry Pi2B, Raspberry Pi Zero, Raspberry Pi ZeroW, Raspberry Pi 3B & Raspberry Pi 3B+

     

    In the past (i.e. sometime in the past three years) the video using an DVI/HDMI cable to this monitor and others was not working. HDMI monitor connection was the only reliable source of video. That appears to have changed. At first I would assume it was hardware but that is not the case. The Raspbian O/S development team code foo has resolved the issue to provide reliable video across all the platforms I tested. I can't tell you what O/S version the change happened but it has happened.

     

    Sean

  • in reply to colporteur

    No surprise. Guess the code upgrade for two monitors adjusted for just one.image

  • in reply to clem57

    As his head does a double-take-When was two monitors added?

     

    I assumed since the code was Debian based two monitors was norm. It would seem a valid assumption to fix anomalies while the code is cracked open to introduce monitors.

     

    Sean