I already posted on the compiz community forums but I figure more eyes are better than less. I hope the "software" forum is the right place to post, I don't believe I'm having any hardware issues.
What I'm seeing is strange desktop corruption/stretching when compiz starts, almost as if compiz thinks my desktop is about four time wider (horizontal) than it really is and this makes nautilus go a bit crazy. All other compiz functionality seems fine. Before compiz starts (with metacity or openbox), the desktop (nautilus) appears normal. I've tried both settings for show_desktop in gconf and they both result in the same (bad) effect. If I use a gradient as my background instead of an image, I see that the gradient is also wrong in the same way (wider than it should be).
Attached are two screen shots: streched-small.jpeg is my desktop with compiz and normal-small.jpeg is the same desktop after running "metacity --replace".
Some pertinent information:
I have a dual head setup with an ATI X18000 running two identical monitors, both at 1280x1024. This problem does NOT happen if I disable one of the display or clone them nor does it happen if I place one monitor on top of the other. The problem only occurs in dual head mode and only if the monitors are logically positioned side by side, horizontally.
I don't think it factors in but it's worth mentioning I'm doing this with an LTSP 5 thin client configuration. My thin client just happens to be a PC with an X1800 at the moment.
* LTSP 5 and Fedora 14 x86_64 on the terminal server
* Fedora 14 i386 thin client (where the X server runs)
* compiz 0.8.6 x86_64
* X.org 1.9.0 i386 (also tried 1.9.1, same result)
* xf86-video-ati 6.13.2 i386 (also tried Fedora-provided xorg-x11-drv-ati-6.13.1-0.3.20100705git37b348059)
* nautilus 2.32.2
xorg.conf (/etc/X11/xorg.conf.xt13 is the real name of the file in my setup):
Option "monitor-DVI-0" "DVI0"
Option "monitor-DVI-1" "DVI1"
Option "DRI" "True"
Option "EnablePageFlip" "False"
Option "RightOf" "DVI0"
Virtual 2560 1024
Screen "MainScreen" 0 0
Option "AIGLX" "On"
Option "Composite" "Enable"
glxinfo output and Xorg.1.log are attached due to character count limits.
All help and suggestions are greatly appreciated!