Troubleshooting

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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: ||<tablestyle="float:right; background: #FFFFFF; margin: 0 0 1em 1em;" style="padding:2.0em;"> {{https://launchpadlibrarian.net/10142846/xswat-192.png}} ||
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=== Common Problems ===
General Issues
 * [[X/Glossary|Glossary]] - Common error messages and terminology
 * [[X/Troubleshooting/HighCPU|High CPU issues]]
 * [[DebuggingKernelSuspend|Suspend and Resume issues]]
 * [[X/Troubleshooting/XError|Program received an X Window System error]]
 * [[X/Bugs/Transitions|X Transitions]] - Explanation for "installing xserver-xorg-core would break existing software"
= Identifying if the issue is a bug or not =
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Display Issues
 * [[X/Troubleshooting/VideoDriverDetection|Video driver detection]]
 * [[X/MonitorDetection|Monitor detection]]
 * [[X/Troubleshooting/Resolution|Resolution detection]]
 * [[X/Troubleshooting/Freeze|Freeze issues]]
 * [[Kernel/Debugging/Backlight|Backlight issues]]
 * [[X/Troubleshooting/BlankScreen|Blank Screen on startup 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
 * [[X/HybridGraphics|Hybrid Graphics is Unsupported]] - Not officially supported, but the community has workarounds
If you aren't sure if you have encountered a software bug in Ubuntu, then you would want to seek help in determining if the issue is a bug or not from [[https://help.ubuntu.com/community/ReportingBugs|here]].
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Input Issues
 * [[X/Troubleshooting/HalBreaksKeyboardAndMouse|Keyboard and mouse quit working]]
 * [[Hotkeys/Troubleshooting|Multimedia hotkey problems]]
 * [[DebuggingKeyboardDetection|Keyboard detection]]
 * [[DebuggingTouchpadDetection|Touchpad detection]]
If you have confirmed the issue is a bug, please read on.
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=== Troubleshooting Techniques === = Determining which type of bug you have =

Not all bugs where X seems to be the root cause are in fact an X related bug. Hence, here is documentation on potential root causes:
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 * [[X/NonGraphicalBoot|Non-Graphical Booting]] - Running X manually, without gdm
Display Issues
 * [[X/Troubleshooting/3D|3D / GLX corruption and other issues]]
 * [[Kernel/Debugging/Backlight|Backlight issues]]
 * [[X/Troubleshooting/BlankScreen|Blank Screen on startup issues]]
 * [[X/i8xxUnsupported|i855 is Unsupported]] - Explanation of why i845, i855, i865, etc. chips aren't supported
 * [[X/Troubleshooting/HugeFonts|Fonts displayed way too big]]
 * [[X/Troubleshooting/Freeze|Freeze issues]]
 * [[X/Troubleshooting/IntelPerformance|Intel graphics performance issues]]
 * [[X/MonitorDetection|Monitor detection]]
 * [[X/Troubleshooting/Resolution|Resolution detection]]
 * [[X/Troubleshooting/VideoDriverDetection|Video driver detection]]

General Issues
 * [[X/Glossary|Glossary]] - Common error messages and terminology
 * [[X/Troubleshooting/HighCPU|High CPU usage issues]]
 * [[X/Troubleshooting/HighMemory|High memory usage issues]]
 * [[X/Bugs/Transitions|X Transitions]] - Explanation for "installing xserver-xorg-core would break existing software"
 * [[X/Troubleshooting/XError|Program received an X Window System error]]
 * [[DebuggingKernelSuspend|Suspend and Resume issues]]

Input Issues
 * [[DebuggingKeyboardDetection|Keyboard detection]]
 * [[Hotkeys/Troubleshooting|Multimedia hotkey problems]]
 * [[DebuggingTouchpadDetection|Touchpad detection]]

= Reporting a confirmed X bug to Launchpad =

== Initial filing of the report ==

First, one will want to familiarize themselves with how to report bugs effectively as per [[https://wiki.ubuntu.com/ReportingBugs|here]].

Once this is reviewed, please file a new bug report with Ubuntu via a terminal:
{{{
ubuntu-bug xorg
}}} Please ensure you have the package xdiagnose installed, and that you click the Yes button for attaching additional debugging information.

== Include developer information ==

One will want to answer the following questions in order for a developer to address the issue:
 * Does the report include debugging information from the relevant article relating to the reported issue?
 * Is this a regression?
 * Does this happen in the latest version of Ubuntu?
 * Does this happen in the latest version available from upstream?

= Debugging techniques =

 * [[X/NonGraphicalBoot|Non-Graphical Booting]] - Running X manually, without a display manager (like lightdm, kdm, gdm...)
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Crashes and Freezes  Crashes and Freezes
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 * [[X/FixingCrashes|X Crash Fixing]] - How to fix X crashes
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 * [[X/Dev/DeviceTreeHWDetection|Device Tree]]
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 * [[X/Quirks|X Quirks]] - Fixes for some common hardware-specific issues
 * [[X/Dev/DeviceTreeHWDetection|Device Tree]]

= Triaging and tagging X bugs =

Please see [[https://wiki.ubuntu.com/X/Triaging|here]] for more on triaging X bugs, and [[https://wiki.ubuntu.com/X/Tagging|here]] for tagging.

= Fixing an X crash =

 * For more on this, please see [[https://wiki.ubuntu.com/X/FixingCrashes|here]].
 * [[X/Quirks|X Quirks]] - Fixes for some common hardware-specific issues.

= Other Resources =

 * [[https://help.ubuntu.com/community/Video|Video Resources]] at help.ubuntu.com
 * For installing [[https://help.ubuntu.com/community/BinaryDriverHowto/AMD|fglrx]] or [[https://help.ubuntu.com/community/BinaryDriverHowto/Nvidia|nvidia]] proprietary drivers.

Identifying if the issue is a bug or not

If you aren't sure if you have encountered a software bug in Ubuntu, then you would want to seek help in determining if the issue is a bug or not from here.

If you have confirmed the issue is a bug, please read on.

Determining which type of bug you have

Not all bugs where X seems to be the root cause are in fact an X related bug. Hence, here is documentation on potential root causes:

Booting

Display Issues

General Issues

Input Issues

Reporting a confirmed X bug to Launchpad

Initial filing of the report

First, one will want to familiarize themselves with how to report bugs effectively as per here.

Once this is reviewed, please file a new bug report with Ubuntu via a terminal:

ubuntu-bug xorg

Please ensure you have the package xdiagnose installed, and that you click the Yes button for attaching additional debugging information.

Include developer information

One will want to answer the following questions in order for a developer to address the issue:

  • Does the report include debugging information from the relevant article relating to the reported issue?
  • Is this a regression?
  • Does this happen in the latest version of Ubuntu?
  • Does this happen in the latest version available from upstream?

Debugging techniques

Crashes and Freezes

Other Techniques

Triaging and tagging X bugs

Please see here for more on triaging X bugs, and here for tagging.

Fixing an X crash

  • For more on this, please see here.

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

Other Resources


CategoryDebugging

X/Troubleshooting (last edited 2017-11-18 18:25:00 by penalvch)