I'm using Ubuntu 14.04 with AMD proprietary drivers. I want to replace the proprietary driver with open source because it is freezing during debugging of multi-threaded program.

I'm uninstalling the proprietary driver using aticonfig --uninstall. Now Ubuntu switches back to open source drive but everything is slow after that.

My machine is also heating too much and it's getting thermal shutdown in a couple of minutes. I do remember installing some packages which resolved this issue but I forgot the name of the packages. I did that last year where I accidentally uninstalled a package. Live CD does not show this over heating and slowing issue.


After installing opensource drive lsmod | grep radeon returns nothing. Which simply means that the radeon module is not loading at startup.

$ lspci | grep VGA
00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Trinity [Radeon HD 7640G]
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Thames [Radeon HD 7500M/7600M Series]

/var/log/Xorg.0.log showed me that I was missing libGL.so.1. So I installed libgl1-mesa-glx. I also loaded the radeon module as suggested here and also blacklisted fglrx (this was important in my case as Xorg.0.log keeps on saying unable to load fglrx; actually it's still saying that but everything is working fine.)

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