Here's a DSDT with some debug lines in and the resulting dmesg. You can
see all the values from _SB.PCI0.LPCB.EC.B* are 0, except BST0 == 2 (AC
connected, 1 otherwise - at 72s I unplugged the AC, which eventually
dims the backlight; at 86s I plugged AC back in and increased
backlight).
**
** Attachment added: original DSDT
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1289748/+attachment/4021584/+files/DSDT.dsl.orig
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** Attachment added: instrumented DSDT
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1289748/+attachment/4021583/+files/DSDT.dsl
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The end of http://mjg59.dreamwidth.org/29954.html makes me wonder if the
battery is simply not being selected somewhere.
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https://bugs.launchpad.net/bugs/1289748
Title:
Still present in 3.14-rc6-trusty, both with and without acpi_osi=Linux.
** Tags added: kernel-bug-exists-upstream
** Changed in: linux (Ubuntu)
Status: Incomplete = Confirmed
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Public bug reported:
The battery level in Xubuntu's panel constantly shows as 0% on this
brand-new laptop, with either of the two batteries supplied with the
machine. The batteries are holding charge, and an LED on the machine
correctly indicates charging/charged (orange/green). On right-click -
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