Bug#910846: X server "Segmentation fault at address 0x0" when using about:support in Firefox-based browsers.

[Gong S.]

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Package: xserver-xorg-video-radeon
Version: 1:18.1.0-1

I am using a standalone AMD HD 7670. "firmware-amd-graphics" is installed and loaded during boot.
It seems that whenever I tries to query information about hardware acceleration, X segfaults.
"dmesg" does not show any error or warning after segfault.
Sometimes other programs or games trigger it as well, with the same problem described in the file Xorg.0.log.
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