No shadows in Unity 4.3 DX11 running on Zeus Hercules?

Is there a known issue with shadows in DX11 running on Intel's integrated hardware? We have been unsuccessful trying to find a work-around.

We are trying to run our project on a CyberPowerPC Zeus Hercules gaming notebook, which requires us to run in DX11. However, running in DX11 does not render shadows on that machine. We have our desktop running the exact same build in DX11 with shadows. Here are some of the differences:

CyberPowerPC notebook:

• Intel HD graphics 5200 (Integrated)

• Intel Core i7-4750 HQ CPU @ 2.0 GHz

• 8 GB RAM

• Windows 8

Desktop:

• NVIDIA GeForce GTX 760

• Intel Core i7-4770 CPU @ 3.4 GHz

• 8 GB RAM

• Windows 7