First I install the latest release of Solus on a laptop Lenovo IdeaPad U165, then I just update all the packages, and there seems to be no problem, but when I close the laptop cover (it goes into standby mode), wait a couple of hours - and blur disappears, I tried rebooting and switching themes, nothing changed. How to fix it?
Problems with the theme after upgrading in Solus Plasma
Solved it by restarting the backend.
System Settings -> Display and Monitor -> Rendering Backend