Hi, 

I orginally posted the question on communities they suggested I posted the question here. So here it is: 

I installed technical preview on a windows 8.1 hyper-v. After upgrading to build 10049. I can do a logon on the system but after wards my keyboard doesnt't work anymore. I tried connecting to the vm with remote desktop aswell as with the hyperv connect. But no still no keyboard. 

• Moved by BrianEhMVP Thursday, April 02, 2015 8:09 PM

I will try this. I reported the issue here because they told me to do this. May one additional thing the hyper v connect does it use rdp too?

If Enhanced Session Mode is enabled then RDP is used.

And, Enhanced Session Mode is enabled by default if your host OS is Windows 8.1 client.

I disabled the enchanced session mode but the issue remains

I discovered something else. My keyboard is working but I need to hold my key down for a a couple of seconds and then the key is shown. 

Maybe its better to post this question in the technical perview of windows 10. 

http://answers.microsoft.com/en-us/insider/forum/insider_wintp-insider_devices/keyboard-not-working-after-login-to-the-desktop/d98e633d-8f36-46f5-918a-80bd4aa0b433