https://bugzilla.kernel.org/show_bug.cgi?id=201607
Bug ID: 201607
Summary: Lenovo ThinkPad X1 Yoga 2nd: No uevent for AC
plug/unplug
Product: ACPI
Version: 2.5
Kernel Version: 4.18.10
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Battery
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Created attachment 279299
--> https://bugzilla.kernel.org/attachment.cgi?id=279299&action=edit
udevadm monitor for disconnecting/reconnecting AC
Hello!
I'm not getting any uevent for disconnecting/reconnecting the power cable on my
laptop. However, `/sys/class/power_supply/AC/online` is always correctly
reflecting the current state, so I believe this is only a uevent issue.
The main symptom of having a missing uevent is that upower never refreshes the
AC supply status, therefore it continues to believe the AC status is the same
as at power-on, and if I powered on my laptop with the AC power connected, it
will fail to notify me of/take action for a low battery.
The battery sends uevents properly; so, I have worked around this issue for the
time being with the following udev rule:
`SUBSYSTEM=="power_supply", ACTION=="change", RUN+="/usr/bin/dbus-send
--print-reply --system --dest=org.freedesktop.UPower
/org/freedesktop/UPower/devices/line_power_AC
org.freedesktop.UPower.Device.Refresh"`
I have attached the output of `udevadm monitor` to demonstrate the missing
uevent.
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