Monday, December 23, 2013
Linux Mint Petra 16 Triple Monitor / Dual Monitor Configuration with ATI Radeon 6950
Spent a couple hours configuring a fresh Linux Mint installation for triple monitors. I have a DVI, HDMI and mini-Display Port (active) connectors for my ATI card.
It was actually rather simple. After wading through many forum posts and doing some experimentation I found the answer (alas I did many reboots and reinstalls, so the forum post is lost). There is one simple trick at the end that makes this work but I thought I would post the whole process.
First, install the proprietary fglrx-updates video driver. This is through Menu -> Administration -> Driver Manager.
Next, reboot the computer. After you reboot the computer, you can check if fglrx-updates is being used by running this in the terminal :
sudo lspci -v | grep VGA -A 10
You should get output similar to the below (Kernel driver in use: fglrx_pci)
Next run the ATI control panel. Do this through the terminal. Make sure to cd into the correct directory first so amdcccle creates/modifies the correct xorg.conf
Do not click the shortcut. It doesn't run properly with SUDO permissions.
Now that you have the ATI control panel (it should say superuser mode on the toolbar) go to the Display Manager.
The next part was unique to me. The center monitor had a much smaller picture. This is due to overscan/underscan settings. This can be set under the appropriate menu on the left hand side under adjustments.
If all went well, the settings will have saved and you will have three monitors with separate images using the ATI driver. Congratulations.
One final step. The menu bar may or may not be on the wrong monitor. Right-click the menu bar and go to properties, then uncheck "Expand".
That's it. Good luck.