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[Bug 1039768] Failure to reduce frequency at low workload
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Tue, 23 May 2017 21:47:46 +0000
  • Message-id: <bug-1039768-21960-gtpQpY4twa@http.bugzilla.opensuse.org/>
http://bugzilla.opensuse.org/show_bug.cgi?id=1039768
http://bugzilla.opensuse.org/show_bug.cgi?id=1039768#c3

--- Comment #3 from Michael Paton <mpaton2000@xxxxxxxxx> ---
(In reply to Takashi Iwai from comment #2)
Hrm, maybe it's some devices that go to D3 at PM?
Is the similar behavior seen when you do suspend-to-RAM? Or is it only via
hibernation?

I had to go back to the 4.10.13-1 kernel and try this. Going to suspend and
then resuming will allow the idle frequency to go down to a nominal 800MHz. A
subsequent hibernate and resume will take the idle frequency to a nominal
500MHz. A subsequent suspend and resume will take the idle frequency back to a
nominal 800MHz.

With kernel 4.11.0-1 a reboot and then suspend and resume takes the idle
frequency to a nominal 800MHz. This kernel does not correctly resume from
hibernate, either locking up or rebooting.

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