OpenGL applications on a PowerPC system running Gentoo with Xorg 6.8.1 cause immediate hardlocks. The same configuration worked fine with Xorg 6.7. Please see the Gentoo bugzilla bug referenced for more details. If I can provide any other information or help tracking down the bug, feel free to ask.
I'm getting the same result on PC hardware. Using a Radeon 9600SE with the fglrx driver. I get a hardlock as soon as I execute fgl_glxgears. This is also on a Gentoo system, but using X.org 6.8.0.
Believed to be fixed by Ian Romanick on 2004-10-17.
*** Bug 1786 has been marked as a duplicate of this bug. ***
Just as a follow-up, after updating my copy of xorg 6.8 with the mesa 6.2 branch, this problem is fixed. Thanks!
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