362b646062
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>
23 lines
675 B
Plaintext
23 lines
675 B
Plaintext
What: /sys/firmware/acpi/pm_profile
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Date: 03-Nov-2011
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KernelVersion: v3.2
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Contact: linux-acpi@vger.kernel.org
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Description: The ACPI pm_profile sysfs interface exports the platform
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power management (and performance) requirement expectations
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as provided by BIOS. The integer value is directly passed as
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retrieved from the FADT ACPI table.
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Values: For possible values see ACPI specification:
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5.2.9 Fixed ACPI Description Table (FADT)
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Field: Preferred_PM_Profile
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Currently these values are defined by spec:
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0 Unspecified
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1 Desktop
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2 Mobile
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3 Workstation
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4 Enterprise Server
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5 SOHO Server
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6 Appliance PC
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7 Performance Server
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>7 Reserved
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