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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Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v3.14 kernel[0].
If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.
If the mainline kernel does not fix
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