I have the same problem and I have the standard keyboard. It's intermittent for me though.

I have been talking with Dell support. So far we have not diagnosed the issue but I think we are getting close. I did a clean install of Windows (not the Dell service tag Windows install) and it fixed the issue. However, once installed I had no drivers. I installed a network driver and allowed Windows to update driver and run standard windows updates. Once the updates finished, the issue was back. I am probably going to reinstall Windows and manually install all drivers myself to see if it's the driver or a windows update. If I figure it out I'll update.

fwonneberger,

Did installing the newer drivers resolve the issue?  Let us know.

It did not. I have also been rolling back drivers, and that also did not help. I emailed Dell support agent I had originally spoke with and they are supposed to be getting some additional help diagnosing it. 

Hello,

We see you are looking for technical assistance. We request you to start a Private Message with us and we will be happy to assist you.

Is there a solution for this? I am having the same issue.

My keyboard works fine in the bios and works good with an external keyboard. Have you tested yours this way?

I have currently been speaking with someone via private message. So far no solution.