Screen sleep doesn't disable backlight

[ale...@magenta.de]

On Qubes 4,2, when the screen goes to sleep after idle time or when I
lock the screen, the screen is black but the backlight is still on. Only
when the system goes to Suspend is the backlight turned off. How can I
fix this?

[Neil du Preez]

Hi,

I have attached screenshots of xscreensaver and power manager settings
that work for me. I discovered them long ago through trial and error,
but I don't remember what other combinations worked and didn't.

Hope it helps.

[ale...@magenta.de]

Neil du Preez:

Yes this helps. Now Lock Screen backlight is off but I didn't try idle
sleep yet.