Date: Sun, 9 May 2010 16:00:49 +0000 From: Andreas Nilsson <andrnils@gmail.com> To: freebsd-acpi@freebsd.org Subject: Re: C-states on core-i7m Message-ID: <AANLkTimSaT46wsgBjyGOtpLptK96rJhIelKkWvO5UUPK@mail.gmail.com> In-Reply-To: <r2ze31a2e1004201056j3d5e03c8r15a397ce4f2c2007@mail.gmail.com> References: <o2me31a2e1004180152oe15684ffxc39e7d0e0ea6f4d@mail.gmail.com> <201004190834.08800.jhb@freebsd.org> <r2ze31a2e1004201056j3d5e03c8r15a397ce4f2c2007@mail.gmail.com>
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On Tue, Apr 20, 2010 at 5:56 PM, Andreas Nilsson <andrnils@gmail.com> wrote: > > > 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 > Lenovo released a bios update, which I installed, but still no luck recognizing more C-states or using anything but C1. For a comparison I booted two other unices ( netbsd and ubuntu linux ), and at least linux sees all c-states and uses C3 ( which I don't even see under FreeBSD ). They both also managed to suspend (to ram ) and ubuntu even resumed. So there seems to actually be something awry with c-states on core-i7 on fbsd :( andrnils
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