its seems i can repeat this bug without reboot just by changing Color Shading Type option in mate-appearance-properties:
- I have set wallpaper, looks ok like pic 1 in first post.
- I have changed Color Shading Type, and then wallpapers got looks ugly like pic 2 in first post.
There is two monitors with different resolution (1280x1024 and 1920x1080).
I have set wallpaper and it’s works fine:
but after reboot there is problem - system set one picture to both monitors:
first pic (1280x1024) on both screens.
use-xorg-monitor-settings is enabled by default
and my xorg.conf is nvidia-settings