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Old 03-27-07, 12:36 AM   #1
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Join Date: Mar 2007
Posts: 6
Unhappy 7900 GS performance issues

Hello. I'm currently running Kubuntu 7.04 beta, but my problems go back even to when I had Ubuntu 6.10 installed. I've tried 64-bit and 32-bit OS'es and drivers, but I'm having some serious issues. I also looked through as many forum threads as I could find, but I still don't have any answers as to why my performance has dropped so significantly with this new 7900 GS installed. The only article that may have shed some light is the following one that says XGL isn't supported with the 7900 GS. If that's the problem, any time frame on when it will be fixed? Anyway, here's that article.

As for my video problems, my computer specs have remained the same except for three upgrades. My previous hardware components where a Pentium 4 3.06 GHz on an Intel 845PE chipset motherboard and an AGP 6800 GT. My new hardware is a Pentium D 2.66 GHz on a VIA PT880 Pro/Ultra chipset motherboard and a PCI-E 7900 GS. In the first configuration, I would get roughly 52 fps in Doom 3 under linux and about 53 or 54 fps under windows. In my new configuration, I get around 53 fps under linux (on a clean install btw) and about 70 fps under windows! I am at a total loss as to why my performance has taken such a drastic hit. I even enabled the coolbits option and sure enough, my card is running at the appropriate speed. If it'll help, here's my xorg.conf file that the nvidia-xconfig program made.

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 1.0 (buildmeister@builder3) Mon Feb 26 23:38:46 PST 2007

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings: version 1.0 (buildmeister@builder3) Mon Feb 26 23:39:38 PST 2007

Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0" 0 0
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"

Section "Files"
RgbPath "/usr/X11R6/lib/X11/rgb"

Section "Module"
Load "dbe"
Load "extmod"
Load "type1"
Load "freetype"
Load "glx"

Section "ServerFlags"
Option "Xinerama" "0"

Section "InputDevice"

# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"

Section "InputDevice"

# generated from default
Identifier "Keyboard0"
Driver "kbd"

Section "Monitor"

# HorizSync source: edid, VertRefresh source: edid
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Mag InnoVision"
HorizSync 30.0 - 86.0
VertRefresh 50.0 - 160.0
Option "DPMS"

Section "Device"
Identifier "Videocard0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
BoardName "GeForce 7900 GS"

Section "Screen"
Identifier "Screen0"
Device "Videocard0"
Monitor "Monitor0"
DefaultDepth 24
Option "metamodes" "1280x1024_75 +0+0; 800x600 +0+0; 640x480 +0+0"
Option "Coolbits" "1"
SubSection "Display"
Depth 24
Modes "1600x1200" "1280x1024" "1024x768" "800x600" "640x480"

Please help me out with this if at all possible. I really would like to get my video card performing up to par under linux, but I have no idea what's going on. I even checked all the and files, and everything appears to check out correctly. I'm currently using the 9755 drivers, but even rolling back to the 9746 drivers resulted in the same results. Thanks for any help you can give me.
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