Date: Mon, 19 Apr 2010 08:34:08 -0400 From: John Baldwin <jhb@freebsd.org> To: freebsd-acpi@freebsd.org Cc: Andreas Nilsson <andrnils@gmail.com> Subject: Re: C-states on core-i7m Message-ID: <201004190834.08800.jhb@freebsd.org> In-Reply-To: <o2me31a2e1004180152oe15684ffxc39e7d0e0ea6f4d@mail.gmail.com> References: <o2me31a2e1004180152oe15684ffxc39e7d0e0ea6f4d@mail.gmail.com>
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On Sunday 18 April 2010 4:52:33 am Andreas Nilsson wrote: > Hello, > > my new laptop has a core-i7 620m and I expected it to have support for > C3-state. > sysctl dev.cpu.0 > dev.cpu.0.%desc: ACPI CPU > dev.cpu.0.%driver: cpu > dev.cpu.0.%location: handle=\_PR_.CPU0 > dev.cpu.0.%pnpinfo: _HID=none _UID=0 > dev.cpu.0.%parent: acpi0 > dev.cpu.0.freq: 149 > dev.cpu.0.freq_levels: 2667/25000 2533/23710 2399/22465 2266/21243 > 2133/20027 1999/18852 1866/17700 1733/16571 1599/15478 1466/14395 1333/13334 > 1199/12297 1049/10759 899/9222 749/7685 599/6148 449/4611 299/3074 149/1537 > dev.cpu.0.cx_supported: C1/3 C2/245 > dev.cpu.0.cx_lowest: C2 > dev.cpu.0.cx_usage: 100.00% 0.00% last 500us > > I've never seen it acutally use even C2. Are lower C-states not supported > yet for the core i7 cpus? I have used C3 on i7 CPUs. I would check your BIOS options perhaps. Note that in the BIOS what shows up as "C3" to ACPI may be called "C6/C7". -- John Baldwin
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