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[Expected Behavior]
When executing systemctl suspend (s2idle), the system should enter a low-power
state. The CPU package should reach deep C-states (C10), power consumption
should drop significantly, and the system fans should stop completely.
[Actual Behavior]
After entering s2idle suspend, the system fans keep spinning indefinitely. The
chassis remains warm, and severe battery drain occurs (system stays in a
shallow/active state). Based on kernel logs, multiple external USB/Thunderbolt
devices and Bluetooth peripherals trigger continuous spurious wakeups or fail
to enter proper low-power runtime D-states.
[Steps to Reproduce]
1. Connect a ThinkPad USB-C Dock and external Bluetooth peripherals (e.g.,
RK-H81RGB keyboard, 2.4G wireless receivers).
2. Execute sudo systemctl suspend.
3. Observe that the screen turns off, but the system fan continues to
run.
[Hardware & Environment Context]
System: Lenovo ThinkPad X1 Carbon Gen 11
OS: Ubuntu Ubuntu 24.04.4 LTS
Kernel: 6.17.0-29-generic
ACPI Wakeup Status (/proc/acpi/wakeup):
The following devices are *enabled by default and suspected of causing spurious
wakeups in s2idle:
XHCI (pci:0000:00:14.0)
TXHC (pci:0000:00:0d.0)
TRP0 (pci:0000:00:07.0)
TRP2 (pci:0000:00:07.2)
[Suspected Root Cause & Dmesg Evidence]
From dmesg, immediately after suspend exit or during the suspend process,
Bluetooth and USB topologies undergo constant disconnect/reconnect events:
[ 1164.379194] input: Compx 2.4G Wireless Receiver as
/devices/pci0000:00/0000:00:14.0/usb3/3-9/...
[ 1435.676700] input: RK-H81RGB 3.0 Keyboard as
/devices/pci0000:00/0000:00:14.0/usb3/3-10/...
** Affects: ubuntu
Importance: Undecided
Status: New
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[ThinkPad X1 Carbon Gen 11] Fan keeps running and high power drain during
s2idle suspend with USB-C Dock/Bluetooth connected
https://bugs.launchpad.net/bugs/2154271
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