How to configure which HDMI port to use in (k)ubuntu if I have a AMD hybrid configuration with a discrete video card

Question

I have a PC configuration that has an AMD APU processor with Radeon Graphics and a Discrete Radeon graphics card. AMD recommends to use the HDMI/VGA/DVI port of the discrete video card for best performance on Windows so I have connected the HDMI port to Discrete Card. When I boot to linux ubuntu distributive (linux mint 15) I have only video output of Xorg on the motherboard HDMI. But when the system is booting I have video output on every port. So on discrete card port i get only the "_" text. So my thought is that xorg.conf is not properly configured.

So how can I configure xorg.conf to get video output on discrete HDMI port?

Answer 1

So I found a solution

Just need to run in terminal after installation

sudo amdconfig --initial -f --adapter=all

Original wiki http://wiki.cchtml.com/index.php/Ubuntu_Raring_Installation_Guide