intel atom N2600 cpu freq_levels on 10.2

Matthew Luckie mjl at
Sun Sep 27 07:56:33 UTC 2015


I just updated to FreeBSD 10.2, and I'm noticing that the CPU frequency
levels available are much more limited compared to FreeBSD 10.1 on the
same system.  For my intel atom n2600, the lowest level available is
600Mhz, whereas with 10.1 it was 75Mhz.

I've put my dmesg from boot at:

dev.cpu.0.cx_usage: 100.00% 0.00% 0.00% last 3645us
dev.cpu.0.cx_lowest: C1
dev.cpu.0.cx_supported: C1/1/1 C2/2/20 C3/3/100
dev.cpu.0.freq_levels: 1600/2000 1400/1720 1200/1440 1000/1160 800/880
dev.cpu.0.freq: 600
dev.cpu.0.temperature: 34.0C
dev.cpu.0.coretemp.throttle_log: 0
dev.cpu.0.coretemp.tjmax: 100.0C
dev.cpu.0.coretemp.resolution: 1 65
dev.cpu.0.%parent: acpi0
dev.cpu.0.%pnpinfo: _HID=none _UID=0
dev.cpu.0.%location: handle=\_PR_.CPU0
dev.cpu.0.%driver: cpu
dev.cpu.0.%desc: ACPI CPU

Is there anything simple I can do to obtain the lower CPU frequency levels?


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