Package C-States, Render standby
Moritz
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.
This would gain me the other 2-3 Watts I was looking for at the beginning.
Comments
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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: http://www.intel.com/content/www/us/en/processors/atom/atom-z8000-spec-update.html
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.
Regards -
I would like to add that we are looking to include the CHT45 fix in the next UEFI BIOS release.
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Thanks for clarifying this! Looking forward for the fix, but so far i'm not running into any trouble.
Regards
moe
