[Ubuntu Wiki] Update of "X/Troubleshooting" by bryce

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The "X/Troubleshooting" page has been changed by bryce:
http://wiki.ubuntu.com/X/Troubleshooting?action=diff&rev1=57&rev2=58

   * [[X/Troubleshooting/Freeze|Freeze issues]]
   * [[Kernel/Debugging/Backlight|Backlight issues]]
   * [[X/Troubleshooting/BlankScreen|Blank Screen on startup issues]]
+  * [[X/Troubleshooting/3D|3D / GLX corruption and other issues]]
   * [[X/Troubleshooting/HugeFonts|Fonts displayed way too big]]
   * [[X/Troubleshooting/IntelPerformance|Intel graphics performance issues]]
   * [[X/i8xxUnsupported|i855 is Unsupported]] - Explanation of why i845, i855, i865, etc. chips aren't supported