06-18-2018 07:07 PM - edited 06-18-2018 07:23 PM
This has been driving me nuts for weeks. It never occurred until a few weeks ago, though: Whenever the Windows 10 lock screen is activated (no matter if automatically after timeout or manually by me), the cooling fan starts running full speed without even stopping until I unlock the computer again.
I saw that many other users seem to have the same problem, even with the 6th generation computers. First I thought I might have caught a crypto miner doing something in the background, but this has been ruled out by extensive malware scans and CPU/GPU monitoring. Neither processing unit does anything, it is definitely a Lenovo thing.
Please help me, my business computer is running 24/7 and has to because I also need to access it remotely. At night I cannot sleep because of the fan humming non-stop. Plus, I am afraid of premature cooling fan bearing wear-out.
Update: I also tried this solution, but it does not help at all.
Solved! Go to Solution.
06-22-2018 07:53 AM
Hi kriegaex, and welcome to the Lenovo User Community!
Does what you are seeing resemble this?
06-22-2018 11:00 PM
No, it does not. When I switch on the CPU history graph on task manager, lock the screen, wait 3 seconds until the fan starts running and log back in a few seconds later to silence the fan again, no spike in CPU usage is being shown. I even tried via Remote Desktop like in the thread you linked to. There I also do not see anything. As soon as I log in via RDP, the fan shuts down again. Funny detail: It stays silent after logging off from RDP again until I unlock the screen once locally and lock it again. So it must be something triggered by the very action of locally locking the screen.
06-22-2018 11:37 PM - edited 06-22-2018 11:55 PM
Correction: It is the same problem, but I could not detect it with Windows task manager, only with SysInternals Process Explorer, activating the CPU graph (Ctrl-I) before locking the screen.
So what can I do against it? The other thread does not seem to have a solution.
06-23-2018 12:04 AM
As suggested here, I deactivated the system device "System Interface Foundation V2 Device" in the Windows device manager. I did not uninstall it, so if I ever want to use the Lenovo Vantage or Lenovo Settings again for any reason, I can just reactivate it. As of now both apps complain about the inactive driver and suggest me to "repair" it, which of course I decline - at the cost of not being able to use the apps anymore.
I do hope Lenovo will fix that driver so everyone can use it again, but for now my problem is solved by this workaround, the CPU fan stays silent now with active lock screen.
06-26-2018 04:24 AM
06-26-2018 06:49 AM
OMG, that also did the trick! I was curious and reactivated the system driver, then found the setting (nowadays it is located in the Lenovo Vantage app) and changed it. Here is a screenshot (sorry, German language but it should help to locate it anyway).
Switch off and - enjoy the silence! (Yes, I like the old Depeche Mode song.)
Thanks for helping narrow down this problem to not just the System Interface Foundation V2 Device but specifically to the dynamic brightness control setting. That should make it much easier for Lenovo to finally fix it.