Display issue with my second monitor using picom and xrandr

[tezgzgvsgvsg]

Ever since this update my second monitor (on the right) has some kind of strange display issue: https://i.imgur.com/dHn9a01.png.
I use the nvidia proprietary driver. If I stop picom, it displays as it should, but I had to start using picom as gtk app had strange black box around window dialogues otherwise. The second monitor still works though, I can play a movie on it without any issue and it displays fine on xfce and gnome.

I start the second monitor with xrandr on i3 by doing:

bindsym $mod+t exec xrandr --output HDMI-0 --auto --right-of DP-0

my hardware and xorg log: https://0x0.st/XIET.txt

xorg.conf: https://pastebin.com/aU5Gu6xJ

picom.conf: https://pastebin.com/0QTEQk97

Thanks for the help.

[eso]

@tezgzgvsgvsg
arandr helps you to produce monitor.sh in ~/.screenlayout
Move your monitors on the screen, Ctrl+Return commits, Layout/ Save As monitor.sh
chmod +x ~/.screenlayout/monitor.sh
In my case the layout is the opposite:
cat .screenlayout/monitor.sh

#!/bin/sh
xrandr --output eDP-1 --primary --mode 1600x900 --pos 1600x0 --rotate normal --output HDMI-1 --mode 1600x900 --pos 0x0 --rotate normal

but in i3 config

##bindsym $mod+t exec --no-startup-id rofi -show window \
#		-config ~/.config/rofi/rofidmenu.rasi
bindsym $mod+t exec xrandr --output HDMI-1 --auto --right-of eDP-1

is effective, although it is not reflected in the print screens.

# set wallpaper
exec --no-startup-id sleep 2 && nitrogen --restore
#exec --no-startup-id sleep 1 && feh --bg-fill /usr/share/endeavouros/backgrounds/endeavouros-wallpaper.png

[petsam]

AFAIK, you don’t need an xorg.conf file, unless you have issues without one. Even then, you only add the absolute minimum configuration inside such a file, if you create one.

OTOH, have you tried other backends for picom, apart from xrender? Try glx or xr_glx_hybrid. Anyway, read picom manual for fine-tuning configuration, and/or troubleshooting the issue (man picom).

[tezgzgvsgvsg]

Ok, so I tried to delete xorg.conf, it didnt work and created some other issues. I fiddled with picom.conf and couldnt find one parameter that made the issue disappear. So as a workaround I ended up modifying my i3 config file so that it also reruns the feh background command when I start my second monitor and it worked.

bindsym $mod+t exec xrandr --output HDMI-0 --auto --right-of DP-0 && feh --bg-scale /home/tbernhard/Pictures/pieter.jpeg

Thanks for the help @eso @petsam