https://bugzilla.kernel.org/show_bug.cgi?id=17291
Len Brown <[email protected]> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEEDINFO |REJECTED Component|Power-Processor |BIOS Resolution| |DOCUMENTED AssignedTo|acpi_power-proces...@kernel |[email protected]. |-bugs.osdl.org |org Summary|acpi_idle sees only c1 - |acpi_idle sees only c1 - |i7-875K |gigabyte GA-P55A-UD6 | |(Core-i7-875) --- Comment #23 from Len Brown <[email protected]> 2010-11-30 05:44:09 --- Thanks for verifying that acpi_idle can get into deep C-states once they are enabled in the BIOS. I can't explain why the BIOS for this board does not enable them when you select the global SETUP defaults. Perhaps a subsequent version of the BIOS gets this right. > ...if there is actually any point enabling > EIST while using turbo mode and these extra C-states? Yes. see the output from turbostat -d -- it will tell you the LFM, which is the low frequency mode associated with the lowest voltage of the part. That operating point is actually the most efficient way to retire instructions. The other operating points, including all other P-states and all turbo states, are higher performance, but also higher voltage, and thus -- by definition -- less efficient. Without EIST, that high-efficiency operating point is not available. -- Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug. You are watching the assignee of the bug. ------------------------------------------------------------------------------ Increase Visibility of Your 3D Game App & Earn a Chance To Win $500! Tap into the largest installed PC base & get more eyes on your game by optimizing for Intel(R) Graphics Technology. Get started today with the Intel(R) Software Partner Program. Five $500 cash prizes are up for grabs. http://p.sf.net/sfu/intelisp-dev2dev _______________________________________________ acpi-bugzilla mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/acpi-bugzilla
