Software⏱️ 3 min read📅 2026-06-11

How to Fix: How to suppress QXcbConnection: XCB error

Suppress XCB errors in KDE Plasma journal logs on Arch Linux.

Quick Answer: Use a more specific logging rule, such as `QT_LOGGING_RULES=

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. ✅ Best Solutions to Fix It
  3. 🎯 Final Words

The QXcbConnection: XCB error is a common issue encountered by KDE Plasma users under Arch Linux. This error occurs when there is an issue with the Qt application's XCB connection, causing it to fail and generate logs in the journal.

Suppressing these errors can be frustrating, as they may not always indicate a critical issue. However, they can still fill up the journal, making it difficult to diagnose other problems. In this guide, we will explore methods to suppress QXcbConnection: XCB error logs while leaving other Qt logs intact.

🛑 Root Causes of the Error

  • The QXcbConnection: XCB error is typically caused by issues with the Qt application's XCB connection, such as incorrect window IDs or resource IDs. This can be due to various factors, including outdated graphics drivers, conflicts with other applications, or incorrect configuration settings.
  • Another possible cause of this error is the use of an outdated version of the Qt libraries or the XCB protocol itself.

✅ Best Solutions to Fix It

Suppressing QXcbConnection: XCB error logs using environment variables

  1. Step 1: To suppress QXcbConnection: XCB error logs, set the QT_LOGGING_RULES environment variable to include the specific category you want to log. For example, to exclude only qt.qpa.xcb logs, use the following command: export QT_LOGGING_RULES="qt.qpa.xcb.*=false"
  2. Step 2: Alternatively, you can also use the QT_LOGGING_RULES environment variable to exclude all qt.qpa.xcb logs by using a more specific rule, such as "qpa.xcb.*=false", or "qt.*.xcb.*=false"
  3. Step 3: Note that setting the QT_LOGGING_RULES environment variable will only apply to the current terminal session and may not persist across reboots.

Suppressing QXcbConnection: XCB error logs using a configuration file

  1. Step 1: Another method to suppress QXcbConnection: XCB error logs is to create a configuration file that sets the QT_LOGGING_RULES environment variable. You can do this by creating a new file in the ~/.config/autostart directory, such as ~/.config/autostart/qt_log_suppression.conf, with the following content: export QT_LOGGING_RULES="qt.qpa.xcb.*=false"
  2. Step 2: To enable this configuration file to run automatically on startup, add it to the autostart directory and make sure that the KDE Plasma session manager is configured to start it.

🎯 Final Words

By setting the QT_LOGGING_RULES environment variable or creating a configuration file, you can suppress QXcbConnection: XCB error logs while leaving other Qt logs intact. This will help keep your journal from getting flooded with unnecessary logs and make it easier to diagnose issues.

Did this fix your problem?

If not, try searching for specific error codes.

🔍 Search Error Database

❓ Frequently Asked Questions

🛠️ Related Fixes

How to Fix: Pc crashes shortly after launching game (rainbow

Fix Pc crashes shortly after launching game (rainbow six siege). Compl

How to Fix: Installing an APK on a locked down phone

Installing an APK on a locked down phone: Try using a rooted device, e

How to Fix: New PC build- no signal and no clue

Fix New PC build- no signal and no clue. Complete troubleshooting guid