Surface Pro 4 type cover suddenly not working.

New idea: if I remember well type cover turned off when it was rotated at back side of the tablet. Also I remember very clearly first type cover issues. It happened occasionally time to time and than pernamently. Is it possible that there is wrong information from rotation sensor which disables the type cover? Type cover and rotation sensor works together right? At least rotation was disabled when type cover was attached.

My rotation sensor stopped working at the same time as type cover, but I don't know what to try next... I tried disabling HID sensor collection without affect... Any idea?

Hello lwarnerADM, 

thak you for your message. It seems you are lucky because I have tried the same thing without success.

I still can't figure out what is wrong. My type cover works with another surface.

I was finally able to update to win 2004 and it doesn't help.

Type cover is visible in device manager saying device migrated, configured and started... (This was also shown in Win 1909 but you have to scroll down in Events tab) There is also shown message "This device is working properly".

It seems that system update makes your computer only better liar.

I had the same problem today. Here's what I did to fix it.

Scenario:  Surface 4 Pro, plus OEM type cover. My GF's laptop, actually. I recently updated it to Windows 10 build 1909 (in the last couple of months). She doesn't use it every day, only a few times a week. Turned it on today, told me the keyboard didn't work.

Checked mechanical, no issues found. Checked function in UEFI, non-functional. Typically this indicates a faulty keyboard. But the Surface keyboard uses writeable firmware, so a possibility existed that there was a firmware issue.

Anyway, the fix in my case was to download the most recent Surface drivers. Windows Updates showed no new updates / patches (I was already up to date). Here's the general page:

https://support.microsoft.com/en-us/help/4023482/surface-download-drivers-and-firmware

and I went to the page for my laptop, the Surface 4 Pro:

https://www.microsoft.com/download/details.aspx?id=49498

The Download button will download a bunch of files, some MSI and some zipped folders. I didn't bother to check if the MSIs are dependent on the zipped folder content, but I unzipped them all anyway.

I first installed the file

"SurfacePro4_Win10_1701001_0.msi" and rebooted.  No change.

I chose that file because there is a matching folder (from the zip files) that contains firmware images. And it is the highest number sequence (e.g. latest version).

Then I installed the file

"SurfacePro4_Win10_18362_20.034.43185.0.msi" and rebooted. Success!  The type cover worked again.

Now, I'm pretty sure that the first package did not contribute to the fix, but I have no way of confirming that.  But anyway, in my case, the above resolved the issue.

I just saw something that might interest some of you with the dead typecover issue. https://www.brydge.com/products/brydge-12-3-pro

I wish there was a way to fix the actual problem, but this brydge device seems to be the best solution out there. *I* plan to order one..

The thing i posted was just a copy paste from page 56 of this thread. I have no idea if it works but when i have time i plan on trying it. Sorry for the false hope but i think everyone of us with this issue is used to that now.