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Old 04-26-2005, 04:13 AM   #1
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Registered: Jan 2005
Posts: 25

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Xorg Composite Extension Slow with nVidia Twinview

I have a Dell Inspiron 8200 with GeForce4Go 64MB graphics. Running 1400x1050 resolution on Xorg 6.8.1. In this configuration I get excellent performance with the X Composite Extension Enabled and running:

xcompmgr -f -c

However, when I enable TwinView in my xorg.conf file the performance suddenly becomes terrible (almost unusable). With TwinView enabled, my second monitor is only running 1024x768, so I don't see why there should be such a huge performance hit.

I am using the standard AGPGART with AGP running in 4X mode. (I am using a standard Fedora Core 3 kernel so it has AGPGART statically compiled in and I can't use the nvAGP module).

I also have the following options set:

Option "TwinView"
Option "TwinViewOrientation" "leftOf"
Option "SecondMonitorHorizSync" "31.5 - 90"
Option "SecondMonitorVertRefresh" "50.0-75.0"
Option "MetaModes" "1024x768,1400x1050"
Option "NvAgp" "2"
Option "DPMS"
Option "RenderAccel" "true"
Option "AllowGLXWithComposite" "true"

Also the only extension is:

Section "Extensions"
Option "Composite" "Enable"

Does anyone else have the same problem? I use my laptop with the second screen most of the time so I'd appreciate any suggestions anyone might have.

Old 04-26-2005, 09:12 AM   #2
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Registered: Jan 2004
Location: Montpellier (France)
Distribution: Gentoo
Posts: 1,014

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you can also try to add the following option to improve a bit:
 Option      "backingstore" "true"
But I've also tried to use composite extension and that's true that with this option enabled performance decreased a lot maybe because of a lack of hardware support


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