Date: Tue, 20 Apr 2010 17:56:19 +0000 From: Andreas Nilsson <andrnils@gmail.com> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-acpi@freebsd.org Subject: Re: C-states on core-i7m Message-ID: <r2ze31a2e1004201056j3d5e03c8r15a397ce4f2c2007@mail.gmail.com> In-Reply-To: <201004190834.08800.jhb@freebsd.org> References: <o2me31a2e1004180152oe15684ffxc39e7d0e0ea6f4d@mail.gmail.com> <201004190834.08800.jhb@freebsd.org>
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On Mon, Apr 19, 2010 at 12:34 PM, John Baldwin <jhb@freebsd.org> wrote: > 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 > Ok, thanks. I'll blame it on the bios then and hope that the next update fixes those issues :) I just hope that Lenovo ships an update soon. andrnils
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