https://bugzilla.kernel.org/show_bug.cgi?id=81051
Bug ID: 81051
Summary: Lenovo T440s - inserted battery not detected under hot
swap
Product: ACPI
Version: 2.5
Kernel Version: 3.11.0-12-generic
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 144121
--> https://bugzilla.kernel.org/attachment.cgi?id=144121&action=edit
gzipped acpidump output
The Lenovo T440s ultrabook advertises a "powerbridge" facility.
It has two batteries the second of which can be removed and replaced without
power down.
Power is automatically switched to be taken first battery.
This all works fine on linux mint 16 except that when I remove the external
battery I see an ACPI undock message in the logs:
Jun 17 22:10:46 mintpad kernel: [14318.961979] ACPI:
\_SB_.PCI0.LPC_.EC__.BAT1: undocking
But when I replace the battery there is no docking message, no
/sys/class/power_supply/BAT1 appears etc.
Cinnamon applets reporting battery status started to get terribly
confused about how much power is left.
The only ways to force a re-detection are - hibernate/thaw,
suspend/resume, shutdown/startup or plugging in the AC power.
Ideally hot swap should allow avoiding the first three of these and if I
had AC power to hand I would not need an additional battery.
When I take one of these actions I do then see the message in the logs:
Jun 17 22:20:35 mintpad kernel: [14575.691824] ACPI:
\_SB_.PCI0.LPC_.EC__.BAT1: docking
I'd love to find a fix or workaround for this bug.
Any help appreciated.
PS
attached is the acpidump generated thus:
michael@mintpad ~/Documents/linux/acpidump $ sudo acpidump > t440s_acpidump.txt
[sudo] password for michael:
Wrong checksum for FADT!
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