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CPU constantly enters/exits C10 during opportunistic suspend #482

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crawfxrd opened this issue Oct 10, 2023 · 0 comments
Open

CPU constantly enters/exits C10 during opportunistic suspend #482

crawfxrd opened this issue Oct 10, 2023 · 0 comments

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@crawfxrd
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crawfxrd commented Oct 10, 2023

On systems with FSP C10 reporting enabled, the CPU will constantly enter/exit C10 during opportunistic suspend. This behavior can be observed by a flickering power LED.

Steps to reproduce

  • Lock the screen, allowing it to turn off
  • Wait 1 minute, watching the power LED
  • Wake and unlock the system
  • Check C-state values: sudo cat /sys/kernel/debug/pmc_core/package_cstate_show

Expected behavior

  • Power LED either remains solid, or blinks at normal interval
  • Lower C-state values don't increase significantly

Actual behavior

  • Power LED flickers on/off rapidly
  • Lower C-state values increase as much as deeper C-state values

Additional info

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