Hello tsuak, and welcome to Ten Forums. :)
Is this happening with the same amount of time you have set for the Turn off display after setting in Power Options? You might change the time to test and confirm.
Change Turn off Display after Time in Windows 10 Windows 10 Tutorials
If not and this is a monitor, you might check its on screen menu settings to see if it may have its own turn off display setting.
Of course it's not hit the set up time. It turns off much more earlier. I tried to set up different time and test. I got the same.
I have a laptop and an additional monitor. Monitor always black when i push win+L. And laptop display turns off after several minutes.What else i can check?
Since this is for a laptop, check to see if you may have any OEM power management software installed. Its settings may be overriding what you have set in Windows Power Options.
Last edited by Brink; 20 Apr 2018 at 08:04. Reason: typo
@tsuak,
After testing different settings on my laptop, I had to set this below for it to work on it to not turn off the display. It appears that on some systems the "Turn off display" setting will override "Console lock display off timeout". It kinda defeats the purpose of only turning off on the lock screen though.
Set "Turn off display after" to "Never".
Set "Console lock display off timeout" to "0".
Quote
