The latest 10.6 mesa drivers are causing Ubuntu 14.4 to freeze when running the
WebGL Conformance Test version 1.0.2. It's crashing at the WebGL GLSL
conformance test: sin_001_to_006.html My video card is an ATI X1300.

Both Chrome and Firefox will trigger the bug. Tested with both the stable and
nightly FF builds. The test locks the system so hard that even the Magic SysRq
key sequence doesn't work. Have to hard power down the system. Reverting back
to the default 10.2 drivers fixes the issue.