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SubjectACPI battery info failure after some period of time, 2.6.3-x and up
powerix root # cat /proc/acpi/battery/BAT0/state
present: yes
ERROR: Unable to read battery status

powerix root # dmesg -c
ACPI-0279: *** Error: Looking up [BST0] in namespace, AE_ALREADY_EXISTS
ACPI-1120: *** Error: Method execution failed [\_SB_.BAT0._BST]
(Node e7bd7680), AE_ALREADY_EXISTS

powerix root # uname -r

This has been going on since about 2.6.3-rc something. Some while after
reading the /proc files, the ability to read the battery information
gets munged.
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