Mike Bird composed on 2019-07-12 20:57 (UTC-0700):

> If convenient it would be helpful if you could determine whether two
> separate non-xinerama X screens and an empty ~/.trinity/share/config
> works for you in Buster 14.0.7. 

Three displays stacked using Intel GPU, configured via xrandr script in
/etc/X11/Xsession.d/:
# xrandr | egrep 'onnect|creen|\*' | grep -v disconn | sort -r
Screen 0: minimum 320 x 200, current 2560 x 3690, maximum 8192 x 8192
HDMI-3 connected 1920x1200+0+1050 (normal left inverted right x axis y axis) 519mm x 324mm
DP-2 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 474mm x 296mm
DP-1 connected primary 2560x1440+0+2250 (normal left inverted right x axis y axis) 598mm x 336mm
   2560x1440     59.95*+  74.92
   1920x1200     59.95*+
   1680x1050     59.97*+
# inxi -GxxS
System:    Host: ab250 Kernel: 4.19.0-5-amd64 x86_64 bits: 64 compiler: gcc v: 8.3.0 Desktop: Trinity R14.0.7 tk: Qt 3.5.0
           wm: Twin dm: startx Distro: Debian GNU/Linux 10 (buster)
Graphics:  Device-1: Intel HD Graphics 630 vendor: ASUSTeK driver: i915 v: kernel bus ID: 00:02.0 chip ID: 8086:5912
           Display: tty server: X.Org 1.20.4 driver: modesetting unloaded: fbdev,vesa
           resolution: 2560x1440~60Hz, 1920x1200~60Hz, 1680x1050~60Hz
           OpenGL: renderer: Mesa DRI Intel HD Graphics 630 (Kaby Lake GT2) v: 4.5 Mesa 18.3.6 compat-v: 3.0
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 Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

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