Ubuntu Wiki

For hard bugs the analysis phase is the most important, and most challenging part of bug work. Depending on how the bug is behaving, there are multiple directions to investigate the issue. Here's some different approaches:

Common Problems

• X/Glossary - Common error messages and terminology

• X Transitions - Explanation for "installing xserver-xorg-core would break existing software"

• i855 is Unsupported - Explanation of why i845, i855, i865, etc. chips aren't supported

• Hybrid Graphics is Unsupported - Not officially supported, but the community has workarounds

• Resolution issues

• High CPU issues

• Blank Screen on startup issues

• Freeze issues

• Single color (brown/blue/etc.) screen on startup

• Fonts displayed way too big

• xserver crash on resume

• Only loads vesa instead of correct driver

• Intel graphics performance issues

• Keyboard and mouse quit working

• Multimedia hotkey problems

• Program received an X Window System error

• X/Troubleshooting/NvidiaDriverMissingKernelDriver

• Monitor Detection problems

• Other common issues...

Troubleshooting Techniques

• X Backtracing - How to collect a backtrace for an X crash

• X/Bisecting - Using bisection techniques to solve regressions or backport fixes

• X/Testing/Touch - Touchscreen and multi-touch testing

• X Quirks - Fixes for some common hardware-specific issues

• X Crash Fixing - How to fix X crashes

• X/InterpretingIntelGpuDump - Ringbuffers, batchbuffers, and the meaning of intel_gpu_dump output

• X/DebuggingWithValgrind

• X/NonGraphicalBoot - Running X manually, without gdm

• Wireless Without X - How to get a wireless network connection without X.

• Direct Wired Without WAP - How to connect two laptops with direct ethernet cord.

• BootOptions

  • fglrx installation on Ubuntu

• DebuggingUsplash

• X/Dev/DeviceTreeHWDetection

• Switching between -fglrx and -ati drivers

• Switching between -nvidia and -nouveau drivers

• The drm.debug=0x04 kernel option can be used to get additional debugging data included in your dmesg output.

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CategoryDebugging