Compositing not enabled in kwin-x11

Hello, i have just noticed, that i don't have composition enabled in my kwin x11 session. I don't remember, when this happened. I have new laptop for several months and i don't remember if composition worked on my old laptop. Both are with some intel intergrated gpu (sorry, don't know how to get

"RE:Compositing not enabled in kwin-x11"

Have you tried to enable or disable compositing with the shortcut ALT Shift F12? If it don't work at first try, try again. It used to work for me. Best regards, Josep