https://bugzilla.kernel.org/show_bug.cgi?id=219340
Bug ID: 219340
Summary: Bug Report: Keyboard Lag When Ejecting or Plugging AC
Power Cord into Thunderbolt 4 Port
Product: ACPI
Version: 2.5
Hardware: All
OS: Linux
Status: NEW
Severity: normal
Priority: P3
Component: ACPICA-Core
Assignee: acpi_acpica-c...@kernel-bugs.osdl.org
Reporter: kevinroan0...@gmail.com
Regression: No
I am experiencing intermittent keyboard input lag when I eject or plug the AC
power cord into the Thunderbolt 4 port on my HP laptop running Arch Linux with
the latest stable kernel version (6.11.1). This issue does not occur in
Windows, and a reboot temporarily resolves the problem.
**System Information:**
- Distribution: Arch Linux (rolling release)
- Kernel Version: 6.11.1-stable
- System: HP laptop with Intel i5-12500H processor
- Thunderbolt Port: Thunderbolt 4
- Issue Location: Occurs both in X sessions and in a tty
- Environment: No external devices connected (except for power supply)
**Steps to Reproduce:**
1. Boot into Arch Linux with kernel 6.11.1.
2. Unplug or plug the AC power cord into the Thunderbolt 4 port.
3. Observe intermittent keyboard input lag immediately after the action.
**Additional Information:**
- I noticed the following error message in the logs:
[ 1695.836166] ucsi_acpi USBC000:00: GET_CONNECTOR_STATUS failed (-110)
- The keyboard input lag disappears after a reboot, but returns when ejecting
or plugging the AC power cord again.
- This issue did not occur under the OEM Windows installation.
**Logs & Diagnostics:**
- Kernel log when the issue occurs:
[ 1695.836166] ucsi_acpi USBC000:00: GET_CONNECTOR_STATUS failed (-110)
**Expected Behavior:**
There should be no keyboard input lag when ejecting or plugging the AC power
cord into the Thunderbolt 4 port.
**Actual Behavior:**
The keyboard becomes unresponsive, and input is delayed, requiring a reboot to
temporarily fix the issue.
**Additional Context:**
- TLP and power management tools like cpupower are disabled.
- The problem persists across multiple X session configurations and also in tty
mode.
- Full reboot resolves the issue temporarily.
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