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First, keep in mind that the best way to get a nice graphical experience is to use your monitors native resolution. It is also recommended that you verify that you have direct rendering enabled before you start to setup composite desktop. In a terminal you can type this.

glxinfo | grep direct

The response should look like this.

direct rendering: Yes

If the response is "No" then direct rendering is not enabled and this guide will try and get you on your way. If you still experience problems with direct rendering after following this guide please keep in mind that this is only a general guide. The best source to get anything setup properly in your particular distribution of Linux is to go to the distributions documentation and/or that distributions forum.

With driver 100.14.11 and older or 9631 legacy(no info about 7185) under the hood... In your /etc/X11/xorg.conf you should have the following options in order to run composite desktop. Options that are commented "##" at the end have been found to help either quality, performance or stability.

Section "ServerLayout"
Option "AIGLX" "False"

Section "Module"
Load "glx"
#Load "glcore" ## comment this line if it is there
#Load "dri" ## comment this line if it is there

Section "Device"
Option "AddARGBGLXVisuals" "True"
Option "AllowGLXWithComposite" "True"
Option "DisableGLXRootClipping" "True" ## This option is deprecated.
Option "RenderAccel" "True" ## Not really needed with newer drivers as it is enabled by default in newer drivers
Option "DamageEvents" "True" ## This option is currently incompatible with SLI and MultiGPU modes
Option "UseEvents" "False" ## Use this one with caution it may NOT work on all systems
Option "TripleBuffer" "True" ## Do NOT use if you have less than 128mb vram
Option "BackingStore" "True" ## Use this one with caution it may NOT work on all systems (freezes when load beryl-manager) but give it a try because it helps performance] It can also break Xinerama

Section "Extensions"
Option "Composite" "Enable"

Section "Screen"
DefaultDepth 24

That is what is recommended for using composite desktop. For further documentation on these settings please refer to the readme file of the particular Nvidia driver you are using. Here is the readme for driver 9755 http://us.download.nvidia.com/XFree86/Linux-x86/1.0-9755/README/appendix-d.html

The option "BackingStore" is a Xorg option not Nvidia. This option is used to enable the server's support for backing store, a mechanism by which pixel data for occluded window regions is remembered by the server thereby alleviating the need to send expose events to X clients when the data needs to be redisplayed. Note that this can significantly increase performance in nVidia TwinView setups.


If you would like to make further changes to improve the graphics performance here is a few suggestions.

(!) If you look in your computer bios and see a MTRR setting, make sure it is set to "DISCRETE"

If you have an AGP card add the following options in your modprobe.conf file or any name this file has in your distro:

options nvidia NVreg_EnableAGPSBA=1 NVreg_EnableAGPFW=1 NVreg_EnableBrightnessControl=1 NVreg_DevicesConnected=1 NVreg_VbiosFromROM=1 NVreg_SaveVBios=1 NVreg_SoftEDIDs=0 NVreg_VideoMemoryTypeOverride=0 NVreg_NvAGP=3 NVreg_ReqAGPRate=8->(8=for 8X AGP, 4=for 4X AGP)

Copy them as they are. They are typed correctly!


Hardware/NVIDIA (last edited 2010-07-27 05:24:55 by 124-169-107-122)