https://bugzilla.kernel.org/show_bug.cgi?id=47851
Summary: Wrong battery capacity on ThinkPad t430s
Product: ACPI
Version: 2.5
Kernel Version: 3.6.0-rc5
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Battery
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
Created an attachment (id=80811)
--> (https://bugzilla.kernel.org/attachment.cgi?id=80811)
.config file from my kernel
Hello!
My ThinkPad battery reports to have approximately 10% more capacity than it
must have by design (which is okay), but in reality the battery have nearly
exactly the design capacity (which is not okay).
/sys/class/power_supply/BAT0/uevent:
POWER_SUPPLY_ENERGY_FULL_DESIGN=43290000
POWER_SUPPLY_ENERGY_FULL=47620000
The problem is, that the ThinkPad powers off at 7% or 8% capacity remaining.
The file /sys/class/power_supply/BAT0/energy_now reports something around
3500000 mWh short before power off, which is still more than 3 Wh. I have taken
a look at energy_now till power off and it doesn't "drop" during the last
seconds or anything else. After power off the battery is completey empty and it
is not possible to switch the ThinkPad on. Of course the Gnome-Power-Manager
trusts this values and doesn't shutdown the ThinkPad.
I'm afraid the battery firmware, UEFI or the Linux kernel is doing something
wrong here. I'm using the latest UEFI-Firmware from Lenovo (1.14) and boot the
ThinkPad in UEFI-only mode. Kernel is a self compiled vanilla 3.6.0-rc5 with
Archlinux, so everything is upstream and nearly "unpatched".
Further resources:
# Only in german. I'm not the blogger, but first comment is from me
http://eniak.info/2012/09/15/lenovo-thinkpad-t430s-mit-linux-arch-linux/
# Maybe Windows is also affected, but than their should be much more complains
about this on the web?
http://forum.thinkpads.com/viewtopic.php?f=45&t=106237
I'have no Windows, so I can't double check it.
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