Subj : Setting up dual monitors in Bookworm
To   : All
From : bp@www.zefox.net
Date : Thu Feb 20 2025 17:42:25

I'd like to try dual monitors with a Pi5 running Bookworm and Wayland.
The system is up to date as of this writing.

The system was initially configured with a Dell HDMI 1920 by 1080
monitor as the primary, so I added  a Dell DVI 1600 by 900 as the
secondary using a DVI-to_HDMI adapter on the cable..

After reboot the system came up with the 1600 by 900 as primary,
and the Screen Configuration utility doesn't notice the original
primary monitor, which was powered  on during boot.

Switching the monitors between hdmi ports makes no difference,
the origninal primary monitor is ignored and the 1600 by 900
monitor is primary.

If I run xrandr, it reports:

Screen 0: minimum 320 x 200, current 1600 x 900, maximum 8192 x 8192
HDMI-1 connected primary 1600x900+0+0 (normal left inverted right x axis y axis) 443mm x 249mm
   1600x900      59.98*+
   1280x1024     75.02    60.02
   1152x864      75.00
   1024x768      75.03    60.00
   800x600       75.00    60.32
   640x480       75.00    59.94
   720x400       70.08
HDMI-2 disconnected (normal left inverted right x axis y axis)

The "maximum 8192 x 8192" seems absurd.

HDMI-2 is NOT disconnected, it's connected and powered up.

Is there a fix for this problem? I do have a couple other
monitors (natively DVI with HDMI adapters) but none are
exact matches. For now I'll try switching away from Wayland
to see if that helps, but would rather not, long term.

Thanks for reading,

bob prohaska

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