[LightDM] race condition with xrandr?

[Jean A]

I had to add a sleep 1s to my .xprofile before calling the layout script I
generated with arandr. The contents of the layout script:

#!/bin/sh
xrandr --output DVI-D-0 --mode 1920x1080 --pos 1920x0 --rotate left
--output HDMI-0 --off --output DP-0 --primary --mode 1920x1080 --pos 0x646
--rotate normal --output DP-1 --off

The contents of my .xprofile:

setxkbmap dvorak &
picom &
sleep 1s;
~/.screenlayout/layout.sh &

Without the sleep command, when i3 launches, half of both screens will be
black. Also, I'm not sure how lightdm magically knows to launch i3, but
maybe it's a bug in that software and not a race condition with lightdm
setting up xorg.
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