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| author | Thomas Renninger <trenn@suse.de> | 2011-11-04 03:33:46 +0100 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2011-11-07 02:48:42 +0100 |
| commit | 362b646062b2073bd5c38efb42171d86e4f717e6 (patch) | |
| tree | 6c98cdb7aa5d9be22e2b24ca06b822455ef4b9f5 /Documentation | |
| parent | Linux 3.1 (diff) | |
| download | linux-362b646062b2073bd5c38efb42171d86e4f717e6.tar.xz linux-362b646062b2073bd5c38efb42171d86e4f717e6.zip | |
ACPI: Export FADT pm_profile integer value to userspace
There are a lot userspace approaches to detect the usage of the
platform (laptop, workstation, server, ...) and adjust kernel tunables
accordingly (io/process scheduler, power management, ...).
These approaches need constant maintaining and are ugly to implement
(detect PCMCIA controller -> laptop,
does not work on recent systems anymore, ...)
On ACPI systems there is an easy and reliable way (if implemented
in BIOS and most recent platforms have this value set).
-> export it to userspace.
Signed-off-by: Thomas Renninger <trenn@suse.de>
Acked-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/stable/sysfs-acpi-pmprofile | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/Documentation/ABI/stable/sysfs-acpi-pmprofile b/Documentation/ABI/stable/sysfs-acpi-pmprofile new file mode 100644 index 000000000000..964c7a8afb26 --- /dev/null +++ b/Documentation/ABI/stable/sysfs-acpi-pmprofile @@ -0,0 +1,22 @@ +What: /sys/firmware/acpi/pm_profile +Date: 03-Nov-2011 +KernelVersion: v3.2 +Contact: linux-acpi@vger.kernel.org +Description: The ACPI pm_profile sysfs interface exports the platform + power management (and performance) requirement expectations + as provided by BIOS. The integer value is directly passed as + retrieved from the FADT ACPI table. +Values: For possible values see ACPI specification: + 5.2.9 Fixed ACPI Description Table (FADT) + Field: Preferred_PM_Profile + + Currently these values are defined by spec: + 0 Unspecified + 1 Desktop + 2 Mobile + 3 Workstation + 4 Enterprise Server + 5 SOHO Server + 6 Appliance PC + 7 Performance Server + >7 Reserved |