Read the statement by Michael Teeuw here.
Rpi 4 and two monitors
-
@NathTheDude how about the output of xrandr -q
-
@sdetweil . I get the following when trying to run different xrandr commands:
Can't open display -
@sdetweil - ahhh. I need to do this from the desktop:
pi@MagicMirrors:~ $ xrandr -q Screen 0: minimum 320 x 200, current 2160 x 1920, maximum 7680 x 7680 HDMI-1 connected primary 1080x1920+0+0 left (normal left inverted right x axis y axis) 477mm x 268mm 1920x1080 60.00*+ 60.00 50.00 59.94 1680x1050 59.88 1280x1024 75.02 60.02 1440x900 59.90 1280x960 60.00 1280x720 60.00 60.00 50.00 59.94 1024x768 75.03 70.07 60.00 832x624 74.55 800x600 72.19 75.00 60.32 56.25 720x576 50.00 50.00 50.00 720x480 60.00 60.00 59.94 59.94 59.94 640x480 75.00 72.81 66.67 60.00 59.94 59.94 720x400 70.08 HDMI-2 connected 1080x1920+1080+0 right (normal left inverted right x axis y axis) 477mm x 268mm 1920x1080 60.00*+ 60.00 50.00 59.94 1680x1050 59.88 1280x1024 75.02 60.02 1440x900 59.90 1280x960 60.00 1280x720 60.00 60.00 50.00 59.94 1024x768 75.03 70.07 60.00 832x624 74.55 800x600 72.19 75.00 60.32 56.25 720x576 50.00 50.00 50.00 720x480 60.00 60.00 59.94 59.94 59.94 640x480 75.00 72.81 66.67 60.00 59.94 59.94 720x400 70.08 pi@MagicMirrors:~ $ -
@NathTheDude ok, I can see the same results now that I have my adapter…
may have to wait til tomorrow to work on it…
-
Hey @sdetweil , no problem at all - no rush indeed. Thank you for your help thus far.
So thanks to this page I have been able to run up two chromiums, one on each page but I have started up chromium directly via terminal from the desktop. Not quite figured out how to implement this as two MM’s and if running up two at once would kill the CPU.
1st terminal session
DISPLAY=:0 /usr/bin/chromium-browser \ --noerrdialogs \ --kiosk \ --window-position=0,0 \ --start-fullscreen \ --user-data-dir=Default2nd terminal session
DISPLAY=:0 /usr/bin/chromium-browser \ --noerrdialogs \ --kiosk \ --window-position=1920,0 \ --start-fullscreen \ --user-data-dir=‘Test2’ -
@NathTheDude copy one MM folder tree to MagicMirror1
then change the config on MM1 to use a different port (8081 maybe)
then start both MM in serverOnly mode (u can set that in config.js too, serverOnly: true,
then launch your two browsers, with the url pointing to separate MM’s…
–app=http://localhost:MM_port,
–app=http://localhost:MM1_portyou can edit the run-start.sh on MM1 to add the
--window-position=1920,0 \ --user-data-dir=‘Test2’parms to the ones already provided
then change both MM configs to serverOnly: “local”,
and it will launch the chrome browser for you
(this is what we call split mode, using a separate browser)then u can have pm2 start both of those when the system boots…
have to change the mm.sh in MM1/installers, and maybe the json file title to MagicMirror1, and point to the local mm.sh -
Hey @sdetweil , thanks for the info on this - I am grateful.
I think I am nearly there but just missing a bit or two.
I copied the ‘MagicMirror’ to ‘MagicMirror2’ folder, updated the config.js, run-start.sh and the pm2_MagicMirror.json files.
When I reboot I now get MM and MM2 load up but both on the same screen.
I have messed around with the chromium line from the ‘run-start.sh’ and I don’t think it is actually be used in this case, I even commented the line out and this did not prevent me from running ‘npm start’ and MM2 still loaded albeit on top of the first MM.
Any ideas on where it is getting it’s info on how to start up chromium?
Thanks
Nathan
-
@NathTheDude sorry. I left out the pm2 steps
From mm2 folder do
pm2 start installers/pm2???.json pm2 saveWhere the json file is the one u modified.
It should start the second mirror app.
The only difference is that window-positio info. And on reboot
pm2 status should show both.
Can u show the two chromium browser lines?
I will attempt to recreate here
-
Hey @sdetweil , after looking at how the current MM is setup with pm2 (pm2 show MagicMirror) this had the ‘mm.sh’ as the target.
Within the MM2 folder I ran: ‘pm2 start ./installers/mm.sh --name MagicMirror2’ which started the MM2 but on the first screen. Then used pm2 save.
I just setup pm2 with the .json file instead of the mm.sh file and the results seem to be the same from what i can see with it getting displayed on the first screen.
Within the start-run.sh, I can comment out the chromium line and and it will not break anything which makes me think this line is not being referenced.
MM line:
chromium-browser --noerrdialogs --kiosk --user-data-dir='Default' --window-position=0,0 --disable-infobars --app=http://localhost:$port --ignore-certificate-errors-spki-list --ignore-ssl-errors --ignore-certificate-errors 2>/dev/nullMM2 line:
chromium-browser --noerrdialogs --kiosk --disable-infobars --app=http://localhost:8082 --ignore-certificate-errors-spki-list --ignore-ssl-errors --ignore-certificate-errors --window-postion=1920,0 --user-data-dir='Test2' 2>/dev/null -
@NathTheDude if u start the json file, pm2 reads the info, gives u a nice name etc.
pm2 delete 0 or 1
pm2 saveThen pm2 start the json file.
And pm2 save
To save for reboot -
I was able to recreate the problem, and good news its just a typo
--window-postion=1920,0should be
--window-position=1920,0missing i in position
-
Thank you for this although it is still producing 2 x MM’s on the first screen (MM and MM2), not sure what could be wrong. If you have it working it obviously must me something I have done wrong…hmmmmm.
I will review all the files and let you know if I find anything.
-
@sdetweil . I know it is a bit extreme but thought I would just start again and burn another image to the SD card. I am in the same position though
- burnt image to sd card, booted rpi and did an update, enabled SSH and VNC
- installed MM with your automation script
- copied the ‘MagicMirror’ Folder to ‘MagicMirror2’, in the new folder I updated:
– config.js - just updated port to 8082
– run-start.sh - updated with window position and profile
– mm.sh - new location
– pm2_MagicMirror.json - updated with new locations - within the MagicMirror2 folder,
– pm2 start ./installers/pm2_MagicMirror.json
– pm2 save - This then started another MM from the MM2 folder on to screen 1
- htop confirms that processes are running from both MagicMirror and MagicMirror2
- pm2 status confirms that both are up
In your setup, if you update the chromium line within run-start.sh with bad entries does that break your setup. Does not seem to be running this command from what I can see in my setup
-
well, I finally got it to work , note I have two displays that support 4k, 3840x2160, so my screen pos is double yours
in /boot/config.txt
[pi4] # Enable DRM VC4 V3D driver on top of the dispmanx display stack dtoverlay=vc4-fkms-v3d max_framebuffers=4and in /boot/cmdline.txt
add cma=384M to the end of the line, like this…plymouth.ignore-serial-consoles cma=384Mthen you must power down and back up for these changes to be applied
found here
https://retropie.org.uk/forum/topic/24436/drm_ioctl_mode_create_dumb-failed-cannot-allocate-memory/9I was getting the DRM cannot allocate memory error
MagicMirror/run-start.sh line for chromium
chromium-browser -noerrdialogs -kiosk --user-data-dir='Default' --window-position=0,0 -start_maximized --disable-infobars --app=http://localhost:$port --ignore-certificate-errors-spki-list --ignore-ssl-errors --ignore-certificate-errors 2>/dev/nullMagicMirror2/run-start.sh line for chromium
chromium-browser --disable-bundled-ppapi-flash -noerrdialogs -kiosk -start_maximized --window-position="3840,0" --disable-infobars --app=http://localhost:$port --ignore-certificate-errors-spki-list --ignore-ssl-errors --ignore-certificate-errors --user-data-dir='Test2' # 2>/dev/nullthis boots up and both MM start via pm2 and display on separate screens, with different content (modules in different positions)
here is a screenshot of my dev system connected to both MM servers at the same time
(the displays are two hdmi ports on the same TV, so I can’t show them physically at the same time)
-
@sdetweil - nice 2 x 4k’s.
So, I did what you mentioned in your last post but unfortunetly I am in the same issue. I wonder if your problem was more to do with 2 x 4k’s which is perhaps different to mine? I am not sure.
-
@sdetweil - if you comment out the chromium line in the run-start.sh does this cause you any issues/errors?
-
@NathTheDude no… you could just change config.js to serverOnly:true, then it won’t try to start chrome
-
@NathTheDude I started by doing
cd MagicMirror node serveronlynote no npm start needed, will run til you ctrl-break out
then tried multiple tries to get chrome on the second display…
(it works manually if the position is mispelled!)then once it worked reliably,
i killed the server instance
then I used pm2 to stop/start that instance til I got that to work.note that I had to use
–disable-bundled-ppapi-flash
on the second instance as it collided with the 1st… -
@saljoke
Hi. Thats right. i only use 1 Pi4 to serve both displays via 2 MM instances. first the originally MagicMirror directory and the second in a MagicMirror2 directory. Both powered up via PM2 and turned off and on via PIR sensor.The config looks like this:
language: “de”,
logLevel: [“INFO”, “LOG”, “WARN”, “ERROR”],
timeFormat: 24,
units: “metric”,
electronOptions: {fullscreen:true, x:1920},1920 is the resolution witdh of the main display.
Very easy to handle and good for the electrical consumption
-
@krocaq see my comment here , you can do it with ONE directory
https://forum.magicmirror.builders/topic/17239/two-display/2?_=1663555322286
Hello! It looks like you're interested in this conversation, but you don't have an account yet.
Getting fed up of having to scroll through the same posts each visit? When you register for an account, you'll always come back to exactly where you were before, and choose to be notified of new replies (either via email, or push notification). You'll also be able to save bookmarks and upvote posts to show your appreciation to other community members.
With your input, this post could be even better 💗
Register Login