2

Windows 10 support Intel speed shift.

Does Linux (kernel) also support it?

Speed shift related info:

https://www.anandtech.com/show/9751/examining-intel-skylake-speed-shift-more-responsive-processors

4

Intel speed shift aka HWP (hardware-managed P-states) is working for Intel Kaby Lake since kernel 4.10:

2

Should support since 3.19:

https://elixir.bootlin.com/linux/v3.19/source/drivers/cpufreq/intel_pstate.c

static void intel_pstate_hwp_enable(void)
{
    hwp_active++;
    pr_info("intel_pstate HWP enabled\n");

    wrmsrl( MSR_PM_ENABLE, 0x1);
}

another commit (v3.19-rc1):

intel_pstate: Add support for HWP

https://github.com/torvalds/linux/commit/2f86dc4cddcb21290ca099e1dce2a53533c86e0b#diff-d06e88b1dd6d576c23e3654d87258879

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