CVS commit: src/sys/dev/acpi

[Jukka Ruohonen <jruoho%netbsd.org@localhost>]

Module Name:    src
Committed By:   jruoho
Date:           Wed May 12 15:59:52 UTC 2010

Modified Files:
        src/sys/dev/acpi: acpi_power.c

Log Message:
Initial pass for issues observed by dyoung@ on HP Pavilion N3270. In this
laptop there is a PNP0C0B ("ACPI fan") with the following properties:

        _PSC : Power state for D3 (alone).
        _PR0 : Power resources for D0.
        _PSx : Power state switch for D0 and D3.

Thus, it is impossible to get or set the D3 power state via power resources
alone; there is only a single PowerResource() and it is for D0.

To tackle this:

  1. Evaluate the direct _PSC control method if and only if there is no
     given _PRx. The order is important; it is known that some other
     systems implement the _PSC method (like _STA) incorrectly.

  2. If no _PRx is available (and thus no _ON or _OFF), do not error out.
     Instead, if we have AE_NOT_FOUND, continue to evaluate the power state
     switch method, _PSx, which (on this laptop) should alone suffice for
     the D0 -> D3 transition.


To generate a diff of this commit:
cvs rdiff -u -r1.11 -r1.12 src/sys/dev/acpi/acpi_power.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.