Hello I'm running JMRI on a Raspberry Pi3 B+, using Steve Todd image It works just fine, and have done already several updates However, I've noticed that when I start the Raspberry, the screen remains black. When I unplug and replug the hdmi cable, I can see the JMRI interface for 1 sec, then the screen goes black again Sometime I can get the display after 1 unplug/re-plug, but sometimes it takes several iterations before i can get the display and use it normaly Any idea where it comes from?
Hi, Seen this with a variety of OS's and causes can include; 1-Old Cable and/or monitor (1 PC one would have to shut off and back on monitor for display... 2-Raspberry Pi's current video resolution is unsupported by monitor 3-Video - Monitor and - or HDMI Configuration on Pi Mr. Todd's image uses the Raspian OS. You may want to check the article about 1/2 down the link https://learn.sparkfun.com/tutorials/setting-up-raspbian-and-doom/setup-raspbian Also, I'm currently using a headless Pi 4 access totally remote using VNC (sometimes from windows and sometimes from IOS-VNC supports numerous platforms or OSs). If you have time, try installing VNC on another device, attach to same network as Pi, remote to Pi, and see how the Pi's Desktop and JMRI is displayed. If appears normal, I'd definitely explore the 3 items above. Hope this helps...
I know it's an old post, but here are some updates First, I forgot to mention that my monitor doesn't have an HDMI port, but DVI. So I've been using an adapter (an old one) Yesterday, I tried with a new HDMI-DVI cable but same issue So I did update the config file by adding "hdmi_safe=1".......and it works, with my "old" HDMI-DVI adapter Thanks Mark for sharing the link
Update: I was still having issues with my monitor and its DVI input Despite the additional line in the config.txt file, I was experiencing a black screen after seeing something for only a few seconds So I replaced the monitor with another one with a HDMI input................and problem solved
That's why I suspect monitor (especially older ones) and/or cable as it was first on the list above. Happy to hear all is good.
Just a guess, I use DVI->HDMI cables on my desktop computer, driven from a NVIDIA GPU, so lots of power for the signals and whatever HDMI to DVI transition logic needs to be driven. RPi doesn't have a lot of power, so it could be the HDMI out doesn't have the amperage behind it to drive all that.
I tried different HDMI cables and also different adapters...I guess my RPI with this specific monitor are just not compatible Because the monitor works fine on a computer with the same adapter and cable
I've encountered those strange incompatibilities on certain combinations of monitor, adapters if used, and cables when connected to a given computer. Glenn mentioned a good point too especially if the monitor is older. Good to hear the replacement monitor is working out.
