KB Article: http://support.microsoft.com/kb/2711774
Consider the following scenario:
- You install the Hyper-V role on a computer that is running Windows Server 2008 R2.
- You install Red Hat Linux on a virtual machine.
- You connect to the virtual machine from a computer that is connected to a non-US keyboard.
In this scenario, the AltGr key does not work in the Red Hat Linux virtual machine.