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I am running Windows 10 Pro, build 10586, on a Lenovo T-520. Fairly recently a behaviour has appeared, where the screen locks, and goes blank, after about 2 minutes of not using the PC.
I have checked all power settings, every single one, and nowhere, when on mains, is the PC set to hibernate or sleep after a time shorter than 2 hours.
What could be causing this very quickly triggered screen lock? To unlock, I must use the keyboard or wiggle the mouse to show the lock screen, then click the mouse to show the password input.
ProfK
Posted 2015-12-24T13:35:16.597
Reputation: 2 094
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Have you checked the screen saver settings? How to Find and Set Screen Savers on Windows 10
– DavidPostill – 2015-12-24T14:03:04.803@DavidPostill I hadn't checked them until now, but on finding that screen, I switched a screen saver on with a delay of 5 minutes to see if anything changes. Maybe a buggy Win 10 was showing the "(none)" screensaver after 1 minute for some reason, and now it should show "mystify" after 5 minutes. – ProfK – 2015-12-24T14:24:43.660
1What happens if you now set it back to
(none)? – DavidPostill – 2015-12-24T14:26:12.290@DavidPostill I think he means he fixed it. – Eddie Dunn – 2015-12-24T14:40:52.830
1@EddieDunn Maybe, but it's not clear from his last comment. I understood it as he now has a screen saver with 5 min delay. It could be he wants no lock at all as the end result ... – DavidPostill – 2015-12-24T14:42:49.833
@DavidPostill I said I had set a screensaver with a 5 minute delay, not that I had actually achieved one. The only differense setting that screensaver made was that now the screen doesn't go blank when it locks, it shows the lock screen, not the 'Mystify" pattern I chose for the screen saver. I have been away, and not able to time the locking, but the screen saver is definitely not working as it should. – ProfK – 2015-12-24T18:10:32.620
@EddieDunn I said I wanted to "see if anything changes". I don't know how you can read into that that I fixed it. David, I will now set it back to
(none), again to see if anything changes. – ProfK – 2015-12-24T18:13:06.197haha, ok must have misread the bit about is showing (none) screen saver...I have a
Turn off display afterunder Display in advanced power settings. Did you check that as well? – Eddie Dunn – 2015-12-24T18:32:41.167@EddieDunn Hehe, no problem. Yes, on for the "On power" settings, those range from a minimum of 4 hours. – ProfK – 2015-12-25T02:18:54.930
Here is what I am talking about: http://imgur.com/79VAT17
– Eddie Dunn – 2015-12-25T03:18:53.913@EddieDunn My setting there is 240 minutes when plugged in. – ProfK – 2015-12-25T08:05:45.417
1Try removing an Lenovo power/battery management software installed and see if that helps. – FiZi – 2016-01-13T06:27:42.750
Are you using a monitor? If so the settings on your monitor may be the problem. – Peter Warrington – 2016-01-17T16:27:46.683
@I'monstackexchange I don't see how anything on the monitor can tell the PC to lock. The comms channel, i.e. VGA, between them is strictly one way, from PC to monitor. If the monitor just went blank, I would consider this, but the PC goes to lock screen. How can a VGA channel make the PC do that? – ProfK – 2016-01-17T22:51:54.483
@ProfK I wanted to check, since I didn't see you mention it. What power plan is it set on? I have actually had the dell power plan do the exact same thing (even though every setting was different), so to fix the issue I changed the power plan to something else (balanced in my case) and set the settings the way I wanted again. Try that to see if it helps, but remember after changing the plan to go and change all those settings in the power plan to prevent it from turning off the screen, going to sleep, or hibernate. It's worth a shot if the power plan is causing the problem. – dakre18 – 2016-01-18T16:52:21.720
@ProfK does the standalone screen have settings of it's own(TV screen or something)? And try installing the latest driver from Lenovo. I saw I'm on stack exchange's comment, maybe the monitor switches off(monitor's settings), the computer detects it and locks (the VGA cable needs to complete the circuit I guess) or the acpi lid driver is malfunctioning. This might help https://www.displayfusion.com/ .
– Varad Mahashabde – 2016-01-19T14:25:44.707@FiZi I'm with you. I have had many problems with the Lenovo Power Manager in the past. Just for kicks, can you try your laptop with another external monitor? – root – 2016-01-19T16:48:16.707
A BIOS update couldn't hurt either. – FiZi – 2016-01-19T17:00:07.170
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I wanted to give you a couple things to read just in case you find anything helpful in resolving the problem you describe... bada bing: https://www.cnet.com/how-to/how-to-disable-the-windows-10-lock-screen/ and bada boom: http://www.laptopmag.com/articles/disable-lock-screen-windows-10... this may be the same or have overlap in the other article or what others have suggested, but in any case, look over just in case the answer lies within...
– Pimp Juice IT – 2016-10-11T00:29:36.940Did you check under "System Settings => System & Security => Energy Option => Change Energy Options and from there Extended Energy Options => Power and Close Lid."? Give it a look to this answer for the opposite problem. It seems that the Lenovo power management can conflict somehow.
– Hastur – 2016-10-12T12:24:29.527