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Asked: 2026-05-26T13:47:59+00:00

The file /sys/devices/system/clocksource/clocksource0/available_clocksource in my Linux box lists the following clock sources: tsc hpet

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The file /sys/devices/system/clocksource/clocksource0/available_clocksource in my Linux box lists the following clock sources:

tsc hpet acpi_pm

I know that tsc is the Timestamp Counter Register in the Processer.
I know the hpet is the High Precision event timer.

I do not know what the acpi_pm is and what hardware implements it? Is this the PIT (programmable interval timer)?

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1 Answer

  1. Editorial Team

    That’s ACPI power management timer.

    The ACPI Power Management Timer (or ACPI PMT) is yet another clock device included in almost all ACPI-based motherboards. Its clock signal has a fixed frequency of roughly 3.58 MHz. The device is actually a simple counter increased at each clock tick

    (from Understanding the Linux Kernel)

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