Package C-States, Render standby

MoritzMoritz New Member Posts: 2
Is there any specific reason that CPU C-State and Package C-State is limited to C1 by default in BIOS? In addition, the Render Standby (RC6) of the GPU has been turned off?

This would gain me the other 2-3 Watts I was looking for at the beginning.


  • Javier ArteagaJavier Arteaga Emutex Posts: 163 mod
    Hi moe,

    The intention is to workaround a hardware bug in the SoC that may cause the processor to hang when switching back from deep sleep states.
    See erratum CHT45 in this document:

    This BIOS setting can be overridden by the operating system, in any case. On Linux, for example, the intel_idle module will not honor this setting unless the intel_idle.max_cstate kernel parameter is set to 0.

  • DCleriDCleri Administrator, AAEON Posts: 599 admin
    I would like to add that we are looking to include the CHT45 fix in the next UEFI BIOS release.
  • MoritzMoritz New Member Posts: 2
    Thanks for clarifying this! Looking forward for the fix, but so far i'm not running into any trouble.

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