Hi, I'm having problems connecting an external HDMI monitor.
Here's my setup, I do not have NVIDIA drivers installed because of known issues.
Only Mirror option is possible.
External monitor is a TV Sony BRAVIA

ASUS K53S

Graphics: Card-1: Intel 2nd Generation Core Processor Family Integrated Graphics Controller

Card-2: NVIDIA GF119 [GeForce GT 520MX]
Display Server: X.Org 1.18.4 drivers: nouveau,intel (unloaded: modesetting,fbdev,vesa)
Resolution: 1366x768@60.01hz
GLX Renderer: Mesa DRI Intel Sandybridge Mobile GLX Version: 3.0 Mesa 13.0.4

dmesg:

[ 3771.342510] EDID block is all zeroes
[ 3771.342520] i915 0000:00:02.0: HDMI-A-1: EDID block 0 invalid.