ACPI battery info failure after some period of time, 2.6.3-x andup

[David Ford]

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
2.6.4-rc1

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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