Well switching from nVidia propietry drivers to the open source Nouveau drivers for nVidia GPU’s I found I had no 3D acceleration, and when running glxinfo etc I was getting
Error: couldn't find RGB GLX visual or fbconfig
And in Xorg.log.0 output file I was seeing
Failed to load module "glx" (loader failed, 7)
Turns out after stuffing around trying to find a solution, I did a search to find the package that held libglx.so and that was in the xserver-xorg-core. Well I reinstalled xserver-xorg-core and it fixed the problem and I now have 3D goodness
# apt-get install --reinstall xserver-xorg-core
Well I thought I’d have another play with Nouveau the open source driver for nVidia GPU’s, as it been a while since played around with them. Since the last time I played with Nouveau it was very buggy and unstable and 3D support was even worse, but I very surprised that there is some 3D support via Gallium3D.
Anyways this how I setup my xorg.conf for dual head setup with nouveau under Debian testing (wheezy):
Option "PreferredMode" "1920x1080_60.00"
Option "PreferredMode" "1440x900_60.00"
Option "RightOf" "monitor0"
VendorName "nVidia Corporation"
BoardName "GeForce GT 220"
Option "Monitor-DVI-I-1" "monitor0"
Option "Monitor-VGA-1" "monitor1"
Virtual 3360 1080
At the moment I am very happy with Nouveau and going to keep using it till it borks it again
Also if you not want to go through the hassle of xorg.conf you could run or put this in your session startup file, example this what I used for testing with ~/.fluxbox/startup
$ xrandr --output DVI-I-1 --mode 1920x1080 --pos 0x0 && xrandr --output VGA-1 --mode 1440x900 --pos 1920x0 &
The above does the same as the above xorg.conf configuration.
Since the last Debian testing kernel (126.96.36.199) update, I have rebooted and found myself being in what seems to be a kernel issue, where by a module “nouveau” by default seized control of the graphics card which prevents the nVidia driver from loading and would not allow me to compile and install the nVidia proprietary driver either. I also didn’t not have “xserver-xorg-video-nouveau” installed.
Here is the work around I used to resolve the problem.
If you use grub2 then edit
to the end of the line that reads
(“quiet” seems a typical default option), so that that line now reads
Now go through and install you nVidia drivers as per normal.
With Gnome System Monitor 2.22 under Debian testing (Lenny) I had the problem when I clicked on the Resources tab the CPU usage would got to 100% on my laptop and desktop.
Well I have been able to fix the problem on my laptop which has and Intel video card by adding Option “AccelMethod” “EXA” to the Device section in my xorg.conf file.
Identifier "Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller"
Option "AccelMethod" "EXA"
When I have worked out how to fix the problem on my desktop using a Nvidia video card I will post the solution.
Thanks goes out to MistaED for pointing out to me that this a problem with the way Cairo rendering is done.
Here is what i have added to my xorg.conf file to get cloned desktop working on my laptop.
this is the extra i added
Option "MonitorLayout" "CRT,LFP"
Option "Clone" "True"
Option "DevicePresence" "True"
Option "VBERestore" "True"
Remember before playing with your xorg.conf file to back it up
sudo cp /etc/X11/xorg.conf /etc/X11/xorg.conf.backup
To see my xorg.conf file