https://bugzilla.kernel.org/show_bug.cgi?id=217076
Bug ID: 217076
Summary: Charging causes high CPU usage on LG Gram laptops
series Z90Q
Product: ACPI
Version: 2.5
Kernel Version: 6.1 - 6.3
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: ACPICA-Core
Assignee: acpi_acpica-c...@kernel-bugs.osdl.org
Reporter: linuxker...@lrob.fr
Regression: No
Hello,
This issue has been spotted and reported on Ubuntu forums, and users encounter
the same abnormal behavior with at least Ubuntu, Fedora and Clear Linux.
Therefore, it appears to be kernel related rather than distro kernel
implementation. I do believe it has to be forwarded here; but since I'm new
here, please pardon me if it shouldn't be posted here or posted this way.
To sum up, symptoms are the following:
- Original post reported this issue occurred when external monitors were
displayed via USB-C.
- Charging an LG Gram laptop (14ZB90Q, 16Z90Q, 17Z90Q) via USB-C (standalone
charger or docking station) causes significant and abnormal CPU utilization and
therefore heat and noise.
- Using default USB-C charger, the issue seems to stop once the laptop is 100%
charged.
- Using Thunderbolt USB-C docking station, the issue seems to remain regardless
of the charging percentage.
- One person reported that booting to Windows 11 then rebooting to Linux
appears to fix the issue for them.
Processes with high CPU utilization on Fedora:
[kworker/u32:8+USBC000:00-con0]
[kworker/0:0+events]
[kworker/0:3+kacpi_notify]
Processes with high CPU utilization on Ubuntu:
kworker/u32:15+USBC000:00-con0
kworker/0:1+kacpi_notify
kworker/u32:2-events_power_efficient
kworker/0:0-events
kworker/1:2+kec_query
kworker/0:3-events
kworker/15:2-events
More technical details and logs on the original topic from "rustyx" on Ubuntu
support forum:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1987829
Best regards
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