@Pete,
Looks like writes to the embedded controller are locking up, causing
timeouts which cause the following errors:
<4>[ 1344.389421] ACPI Exception: AE_TIME, Returned by Handler for
[EmbeddedControl] (20110413/evregion-478)
<4>[ 1344.389431] ACPI Error: Method parse/execution failed
[\_SB_.PCI0.ISAB.ECDV.ECW1] (Node ffff880156c533c0), AE_TIME
(20110413/psparse-536)
<4>[ 1344.389442] ACPI Error: Method parse/execution failed [\ECWB] (Node
ffff880156c53500), AE_TIME (20110413/psparse-536)
<4>[ 1344.389451] ACPI Error: Method parse/execution failed [\ECG6] (Node
ffff880156c53690), AE_TIME (20110413/psparse-536)
<4>[ 1344.389459] ACPI Error: Method parse/execution failed [\_SB_.BAT0._BST]
(Node ffff880156c4eeb0), AE_TIME (20110413/psparse-536)
The _BST method (Battery Status) is one of the failing ACPI methods,
which results in battery failed status read which is the root cause of
the problem. I suggest we try and work around the problem by either
one or both of the following kernel parameters:
1. ec_delay=1000
2. acpi_serialize
Please try these and let me know if you see the problem again (and if
the AE_TIME error is reported when evaluating \_SB_.BAT0._BST)
** Changed in: linux (Ubuntu)
Status: Triaged => In Progress
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https://bugs.launchpad.net/bugs/844276
Title:
AC Adapter State on Dell Latitude XT2 is not working
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