Thread Necrosis, but because this thread comes up on a search for this driver:
I am using Mint 15 with a Radeon 7670m and Intel dual graphics setup.
Admittedly I am using the XFCE4 desktop, and have not had any issues with it.
The instructions that I followed to set up the system are these ones:http://anup07.wordpress.com/2013/08/03/installing-ati-radeon-7670m-hd-graphic-driver-on-linux-mint/
(Hopefully the forum doesn't ban me from posting links)
When I first got the laptop and put Ubuntu on it, it took a couple of times to get the graphics card working. But over the past couple months, I've changed OS a couple of times, and got a lot of practice in, and the instructions do work if you are careful in following them.
Before the graphics drivers were correctly installed, the fan did run most of the time, but that was because it was running the graphics card at full-speed the entire time. Once the drivers were installed, the whole laptop cooled down (yes, it was slightly too hot to rest your hands on comfortably!), and the fan turned on only when needed.
Also makes a big difference in battery life, going from ~2 hours to 4-5 hours per charge.
The output for my inxi -Gx command is pretty similar to yours:
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Graphics: Card-1: Intel 3rd Gen Core processor Graphics Controller bus-ID: 00:02.0
Card-2: Advanced Micro Devices [AMD] nee ATI Thames XT [Radeon HD 7670M] bus-ID: 01:00.0
X.Org: 1.13.3 drivers: fglrx,intel Resolution: firstname.lastname@example.org
GLX Renderer: Mesa DRI Intel Ivybridge Mobile GLX Version: 3.0 Mesa 9.1.7 Direct Rendering: Yes