Gentoo Archives: gentoo-user

From: Paul Hartman <paul.hartman+gentoo@×××××.com>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] Core i7 M620 power management problem
Date: Wed, 29 Dec 2010 17:42:21
In Reply to: [gentoo-user] Core i7 M620 power management problem by Bill Longman
1 On Wed, Dec 29, 2010 at 11:13 AM, Bill Longman <bill.longman@×××××.com> wrote:
2 > A strangeness I have noted is that /proc/cpuinfo has this for its power
3 > capabilities:
4 > power management:
5 > Nothing.
7 FWIW I have Core i7 920, and it also has nothing in the power
8 management in cpuinfo, but CPU frequency scaling does work and speeds
9 change (using ondemand governor, in a desktop machine).
11 $ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_*
12 2661000 2660000 2527000 2394000 2261000 2128000 1995000 1862000 1729000 1596000
13 conservative userspace powersave ondemand performance
14 1596000
15 acpi-cpufreq
16 ondemand
17 2661000
18 1596000
19 <unsupported>
21 So it seems similar to yours except that your max_freq and min_freq
22 are the same! Which matches what you say about it never going faster
23 than the minimum speed.
25 In kernel docs Documentation/cpu-freq/cpu-drivers.txt there is some
26 information about how the min and max speed are set by the policy that
27 is in use (by whatever driver is controlling the scaling). So I don't
28 know if there is a userspace program (like KDE laptop stuff) that
29 might be overriding with its own faulty settings?
31 Seems like your kernel settings are probably okay since you can see
32 all of that so far. If you run powertop can it see all of the C-states
33 and P-states without any problems?


Subject Author
Re: [gentoo-user] Core i7 M620 power management problem "Stefan G. Weichinger" <lists@×××××.at>