2.6.21-rc1: more ACPI errors (EC__)

[Meelis Roos]

I tested 2.6.21-rc1 on my laptop (IBM X20 with 440BX) and found two 
problems:

First, a seemingly harmless one - ACPI error messages during bootup:

ACPI Exception (evregion-0420): AE_NOT_FOUND, Returned by Handler for [EmbeddedControl] [20070126]
ACPI Exception (dswexec-0462): AE_NOT_FOUND, While resolving operands for [OpcodeName unavailable] [20070126]
ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.PCI0.ISA_.EC__.BAT0._STA] (Node d3c435e0), AE_NOT_FOUND
ACPI Exception (evregion-0420): AE_NOT_FOUND, Returned by Handler for [EmbeddedControl] [20070126]
ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.PCI0.ISA_.EC__.AC__._PSR] (Node d3c43540), AE_NOT_FOUND
ACPI Exception (ac-0095): AE_NOT_FOUND, Error reading AC Adapter state [20070126]

And second, there were ACPI error messages about EC__ during shutdown. 
These messages appeared, then the "acpi_power_off called" message 
appeared, then it waited for about 5 seconds (this does not happen 
normally) and then it succeeded shutting down. Captured a screenshot of 
these messages, temporarily available at 
http://www.cs.ut.ee/~mroos/x20-shutdown-acpi-errors.jpg

-- 
Meelis Roos (mroos@xxxxxxxx)
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