Read the statement by Michael Teeuw here.
Rpi 4 and two monitors
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@NathTheDude so, it looks like one big desktop…
u should be using Buster OS, right? so you can see the temples across the big image, some on the right display, some on the left…
NOT the same on both?
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@sdetweil , yeah buster.
I can see temples on both screens, the image does not flow between screens. When looking at the 'Appearance Settings’, the is a tab for each HMDI with different settings but these are purely for what image is seen on the desktop. You can use the same image on both desktops however this is purely related to the desktop image or so is what I understand of it.
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@NathTheDude said in Rpi 4 and two monitors:
@sdetweil , I opened up a terminal session on each screen and both indicated the same display was being used (:0).
From the ‘Appearance Settings’ window (‘Prefences’ > ‘Apprearance Settings’, there is a ‘Taskbar’ tab and in this tab you select which hdmi output you want the taskbar to be on. You can choose both.
Sorry, with my previous comment - I meant to say you ‘CANT’ choose both (taskbar can only be on one screen/output).
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@NathTheDude there is a firmware update on the pi4… execute
sudo rpi-update -
@sdetweil , so I did the firmware update and rebooted.
Slightly different now but still can not quite get this to work. When I now run a terminal on screen 1 the output of ‘echo $DISPLAY’ is ‘:0.0’ and when I run the terminal on the 2nd window the output is ‘:0’. However the same is seen when I try to either user ‘0’ or ‘0.0’ in run.sh (mm gets display on the 1st monitor.
I have again tried to use different numbers (1,2,3 and 0.1, 0.2, 0.3) but again, these are not valid entries.
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@NathTheDude how about the output of xrandr -q
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@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…
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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’
