Thanks Joe,
After enabling multi-monitor support in the BIOS to enable the integrated graphics, I also had to set the BIOS's "Initiate Graphics Adapter" setting to IGD (from PEG). It's workable, but it requires physically moving the monitor out cable from the discrete card to the onboard output when i need to access BIOS. Miracast shouldn't be this hard to enable. Please work on this.
Justin