skylake "k" overclocking doesn't work under linux?

orlfman · 2016-01-07 20:30:49

anyone running a "k" skylake processor notice turbo boost, nor multiplier overclocking, work at all under linux?

my motherboard is a asus maximus viii hero (bios 1202) and i noticed that my 6700k with either 4.2 or 4.3 kernel refuses to overclock. if i turn off c-states, manually set voltage, and set my multiplier to something as little as 42, no matter what, linux only reports 4ghz speed.

when i have governor set to ondemand it scales between 800mhz and 4ghz. even if multiplier is set to 42.

i've also tried setting cpu governor to performance and even went as far and disabled cpu frequency scaling support (intel_pstate) in the kernel.

even turbo doesn't work if i set everything to default. it never goes above 4ghz under linux. i use cat /proc/cpuinfo and that i7z git program to monitor cpu frequency.

overclocking only works on windows, which currently i'm running windows 10 atm. switched back after the whole nvidia segfaults and steam crashing fiasco. i have c-states off, turbo on, multiplier set to a fixed 42 sync all cores, manual voltage of 1.23v's, and windows power management set to performance.

Last edited by orlfman (2016-01-07 20:31:49)

Roberth · 2016-01-08 02:12:50

Why can't you overclock it in the UEFI settings?

Last edited by Roberth (2016-01-08 02:13:15)

graysky · 2016-01-08 13:44:45

I have no experience with the the Skylake, but on many others including ivybridge and haswell... If the frequency is set in the bios, the kernel doesn't trumpet that with those in my experience. If you raise the multiplier in your bios, boot to the live cd the higher multiplier should be available.

orlfman · 2016-01-08 16:56:15

update:
so i updated my bios to 1302 and decided to enable speedstep. after doing this the performance governor with intel_pstate finally achieved 4200mhz, but only rarely. the performance governor states, and does indeed, range from 800mhz - 4200mhz. it keeps it at 800mhz for nearly all loads. sometimes shooting up to 2ghz, 3.5ghz, and the occasional 4.2ghz when under extreme load. i've noticed while trying to play something like team fortest 2 not all cores stayed at 4.2ghz. it kept bouncing around between the low 2ghz range to 4.2ghz.

so i disabled intel_pstate in my kernel parameters and had it fall back to acpi-cpufreq. its performance governor only recognizes between 800mhz and 4000mhz. it doesn't see that i have set to 4.2ghz in my bios so it will only max out at 4000mhz. its performance governor, even though seeing 800-4000mhz, keeps it at a constant 4000mhz which i like... if only it was 4200mhz.

so intel_pstate performance doesn't keep it set to its max speed, and acpi-cpufreq doesn't read the frequency ranges correctly. i haven't tried disabling cpu frequency scaling completely in the kernel yet. i sorta just sighed and gone back to windows full time since windows just werks in this regard. i don't even need speedstep enabled in windows.

edit:
my bios settings:
sync all cores, multi set to 42, turbo on, speedstep on, c-states disabled, vt-d disabled, manual voltage of 1.23vs, load-line of level 4, bclk of 100.00, svid disabled, and asus enhancement disabled.

Last edited by orlfman (2016-01-08 17:08:01)

graysky · 2016-01-08 17:06:51

Keep pstates, don't disable cstates, and monitor using mprime testing with i7z.

Last edited by graysky (2016-01-08 17:07:43)

Arch Linux

#1 2016-01-07 20:30:49

skylake "k" overclocking doesn't work under linux?

#2 2016-01-08 02:12:50

Re: skylake "k" overclocking doesn't work under linux?

#3 2016-01-08 13:44:45

Re: skylake "k" overclocking doesn't work under linux?

#4 2016-01-08 16:56:15

Re: skylake "k" overclocking doesn't work under linux?

#5 2016-01-08 17:06:51

Re: skylake "k" overclocking doesn't work under linux?

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