Comment 5 for bug 135206

There is insufficient information to troubleshoot this issue. When reporting X bugs, please always attach your xorg.conf, Xorg.0.log, and the output from lspci -vvnn. Also, it would make triaging easier if you attach the files individually rather than in a tar file, as this adds extra steps for verifying if the bug has sufficient info.

Because this bug did not appear in Tribe3, that suggests it's not an xresprobe bug. My guess would be that it is caused by one of the drivers that was updated since Tribe4, but without the config and log files it is impossible to say for sure.