Black screen on HMDI output, content on remote browser

[chris_d]

@sdetweil said in Black screen on HMDI output, content on remote browser:

lsb_release -a

Distributor ID: Raspbian
Description: Raspbian GNU/Linux 10 (buster)
Release: 10
Codename: buster

I am using ssh to remote into the pi
The following thread seems similar, but does not offer a solution
https://forum.magicmirror.builders/topic/17211/having-trouble-with-launch-perhaps-display-value?page=1

[sdetweil]

@chris_d interesting. I ssh into my mirror systems all the time and never have trouble.

do

pm2 stop all
cd ~/MagicMirror
npm start >somefile.txt 2>&1

wait til the black screen
ctrl-c in the ssh terminal

then nano somefile.txt, scroll down
see if there are any errors reported…

the package.json will set DISPLAY if not set

[chris_d]

@sdetweil said in Black screen on HMDI output, content on remote browser:

pm2 stop all
cd ~/MagicMirror
npm start >somefile.txt 2>&1

Errors are:
[2883:0119/213451.321388:ERROR:viz_main_impl.cc(186)] Exiting GPU process due to errors during initialization
[2916:0119/213451.509005:ERROR:gpu_memory_buffer_support_x11.cc(44)] dri3 extension not supported.

[sdetweil]

@chris_d in from to the npm start line do

export ELECTRON_DISABLE_GPU=1

and rerun…

[chris_d]

@sdetweil said in Black screen on HMDI output, content on remote browser:

export ELECTRON_DISABLE_GPU=1

No error now, but still a black screen

[sdetweil]

@chris_d on the black screen press ctrl-shift-i to open the developers window, then select the console tab and scroll up for any errors usually red text

[MikeBishop]

@sdetweil

I’m having what appears to be the same problem – HDMI is black (but apparently happy from the log output), while browser access is fine. I can’t get the dev tools to come up in Electron; perhaps unsurprisingly, the browser dev tools don’t show any errors that weren’t there on my old instance.

[sdetweil]

@MikeBishop are you also running on buster?

[sdetweil]

@chris_d try npm start dev to open dev window on startup

also can u try the npm start on the pi desktop, not over ssh?

[MikeBishop]

@sdetweil

Bullseye, looks like. Whatever’s in the newest RPi OS release, anyway.

For the moment, I’ve swapped back to the other SD card that’s working. System’s been a little flaky the last few days, figured I’d try a fresh install on a new card in case that’s starting to go; hit this issue on the new one. When I have a few minutes to pull the Pi from the mirror and bring it back to my desk, I’ll give npm start dev a try on the newer one.