[florent]

Thanks for the very quick reply!

I thought removing the AMD proprietary driver would be enough... obviously not...

Now, I don't seem to be able to remove fglrx. I've tried several step-by-step guides which all pretty much say to do this:

Code:

sudo apt-get remove --purge fglrx fglrx-amdcccle fglrx-dev
sudo apt-get remove --purge xserver-xorg-video-ati xserver-xorg-video-radeon
sudo apt-get install xserver-xorg-video-ati
sudo apt-get install --reinstall libgl1-mesa-glx libgl1-mesa-dri xserver-xorg-core
sudo mv /etc/X11/xorg.conf /etc/X11/xorg.conf.backup
sudo rm -rf /etc/ati

But after reboot the dmesg output still has the same lines in it. See here: pastebin

Again sorry for being such a novice

I had the same problem and I manage to fix it: to run properly the Radon Open Source driver after a previous installation of fglrx propriatary driver.

What I did is:

1) remove the fglrx driver and install Open Souce one following : https://wiki.ubuntu.com/X/Troubleshootin...rge_-fglrx

But I was still facing problem with Video tearing on XBMC. (No Harware acceleration and 180% of CPU usage in XBMC)

I was stuck and read carrefuly the difference of between the "var/log/Xorg.0.log" file: Mine and those posted here. I noticed that the difference was :

Code:

LoadModule: "ati"
Warning, couldn't open module ati
UnloadModule: "ati"
Unloading ati
Failed to load module "ati" (module does not exist, 0)

So ATI Driver was not use.... and fglrx neither

Code:

LoadModule: "fglrx"
Warning, couldn't open module fglrx
UnloadModule: "fglrx"
Unloading fglrx
Failed to load module "fglrx" (module does not exist, 0)

None of the two drivers "fglrx" (because removed) nor "ATI" was taking into account by Xorg. The reason was probably "fglrx" not completly removed or "ATI" Radeon not completly installed.

So I run a installation again

Code:

sudo apt-get install xserver-xorg-video-ati

And the magic came! Now in my "var/log/Xorg.0.log" file:

Code:

[ 37959.948] (II) LoadModule: "fglrx"
[ 37959.949] (WW) Warning, couldn't open module fglrx
[ 37959.949] (II) UnloadModule: "fglrx"
[ 37959.949] (II) Unloading fglrx
[ 37959.949] (EE) Failed to load module "fglrx" (module does not exist, 0)
[ 37959.949] (II) LoadModule: "ati"
[ 37959.949] (II) Loading /usr/lib/xorg/modules/drivers/ati_drv.so
[ 37959.949] (II) Module ati: vendor="X.Org Foundation"
[ 37959.949]    compiled for 1.15.1, module version = 7.3.0
[ 37959.949]    Module class: X.Org Video Driver
[ 37959.949]    ABI class: X.Org Video Driver, version 15.0
[ 37959.949] (II) LoadModule: "radeon"
[ 37959.950] (II) Loading /usr/lib/xorg/modules/drivers/radeon_drv.so
[ 37959.950] (II) Module radeon: vendor="X.Org Foundation"

and on XBMC: no more Video Tearing and 5% CPU usage: Hardware acceraltion is working!!!