on 10/11/2010 16:07 Mathias Picker said the following:
> Hi,
> 
> my N930 reports C1 as lowest cpu state:
> 
> mp% sysctl -a|grep cx_supp
> dev.cpu.0.cx_supported: C1/0
> dev.cpu.1.cx_supported: C1/0
> dev.cpu.2.cx_supported: C1/0
> dev.cpu.3.cx_supported: C1/0
> 
> I searched the net, but I can't tell if that's correct. 
> 
> The system runs rather loud with FreeBSD (fan running full speed, cpu
> temp around 59°C).
> 
> I can't switch off the second graphics card, one of my last ideas of
> getting it any cooler would be c2/c3. I've followed every other tip from
> TuningPowerConsumption and need still around 3315 mA.

Your ACPI tables say that there is no C-state beyond C1.

Try installing and booting recent head/CURRENT kernel on that machine.
And enable C1E in BIOS.

> boot -v output: http://pastebin.com/VWYifahu
> acpidump -dt: http://pastebin.com/V82SuzrW
> 
> cpufreq scaling works fine:
> 
> dev.cpu.0.%desc: ACPI CPU
> dev.cpu.0.%driver: cpu
> dev.cpu.0.%location: handle=\_PR_.C000
> dev.cpu.0.%pnpinfo: _HID=none _UID=0
> dev.cpu.0.%parent: acpi0
> dev.cpu.0.freq: 800
> dev.cpu.0.freq_levels: 2000/7632 1700/5945 1400/4582 1100/3422 800/2328
> dev.cpu.0.temperature: 59,1C
> dev.cpu.0.cx_supported: C1/0
> dev.cpu.0.cx_lowest: C1
> dev.cpu.0.cx_usage: 100.00% last 2038us
> dev.cpu.1.%desc: ACPI CPU


-- 
Andriy Gapon
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