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[Bug 1039768] Failure to reduce frequency at low workload
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Wed, 24 May 2017 18:38:47 +0000
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--- Comment #4 from Michael Paton <mpaton2000@xxxxxxxxx> ---
With kernel 4.11.1-1, prior to the application of the updates in
Changes_20170522.txt, a freshly booted kernel would settle at a nominal idle
frequency of 800MHz, and a suspend and resume would settle at a nominal idle
frequency of 500MHz.

I then applied the updates from Changes_20170522.txt and now a fresh reboot
causes the idle frequency to settle at a nominal 2GHz. A suspend and resume now
causes the idle frequency to settle at a nominal 500MHz. Interestingly the
first suspend did not complete properly. It blanked the screen, turned the
power light off, and when I would have expected a brief flash from the power
light (after a couple of seconds), the power light came on steadily, the screen
was blank apart from the KDE cursor. When I pressed the power button (as if to
resume from suspend) the idle frequency settled at a nominal 500MHz.

I wonder if this is indication that the enabler for correct power management
and lower frequencies is executing as the system goes down for suspend (or
hibernate) rather than when it resumes?

One of the early messages displayed very briefly on the console on the
unsuccessful resume from hibernation is "sparse file not allowed" I'll file a
separate bug report on this when I have a little more information. I don't find
this text string in the kernel tree though.

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