Changed behaviour of screensaver black between -11 and 12

Hi!
Maybe i posted this in wrong tread but.... Up to and with 11 releases of Libreelec the screensvaver black turned my Samsung q90r pitch black. Why is this good? Samsung in their wisdom removed the function "turn off screen" and refuses to add it again. I was so happy with libreelec up until now when the 11.0.4 librespot broke. Installed libreelec 12.2.1 and eveything works as before except that screensaver black doesn't turn screen pitch black. It's more like in windows=some dullish darkgrey effect. This can be very hard to reproduce as my other tv samsung q60 turns it self black even in windows using "blank" screensaver. First couple of seconds it's dark grey, then pitch black. There must be some identifiable differences beween screensaver black in 11 and 12. All can be solved if librespot 12.0.4 can be downported to 11.x. I know i should have probably posted logs from 11 and 12 but now i'm in a hurry so it will be later if needed. This is my first post so don't be too harsh.

Thanks in advance