Take the 2-minute tour ×
Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

I have this odd behavior that the idle power is either high or low. E.g. sometimes it is 20 W and sometimes 10 W. It stays there until rebooted of suspend/rewake.

All parameters that I know of like backlight, cpu speed, wifi, bluetooth are the same.

Read power using powertop and cat /sys/devices/platform/smapi/BAT0/power_now. They agree on the power.

I'm running archbang x64 (arch with some things preconfigured) on a Lenovo x220 laptop.

Some info from powertop

PowerTOP Version    v2.1
Kernel Version  Linux version 3.7.9-1-ARCH (nobody@foutrelis) (gcc version 4.7.2 (GCC) ) #1 SMP PREEMPT Mon Feb 18 02:13:30 EET 2013
System Name LENOVO 4291P36 ThinkPad X220
CPU Information 4x Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz
OS Information  Arch Linux

** Discharge info during a low state**
Device Power Report

The battery reports a discharge rate of 12.0 W

System baseline power is estimated at 7.47 W

Power est.  Usage   Device name
4.96 W  100.0%  Radio device: iwlwifi
4.74 W   33.3%  Display backlight
4.74 W   12.5%  Display backlight
21.0 mW  0.0 pkts/s Network interface: wlan0 (iwlwifi)
0 mW     1985 rpm   Laptop fan
0 mW    326.8 pkts/s    Network interface: wwan0 (cdc_ncm)
0 mW    275.8 ops/s GPU
0 mW    100.0%  USB device: usb-device-8087-0024
0 mW    100.0%  USB device: EHCI Host Controller
0 mW    100.0%  USB device: F5521gw (Lenovo)
0 mW    100.0%  Radio device: thinkpad_acpi
0 mW     10.9%  CPU use
0 mW     0.0%   Audio codec hwC0D0: Conexant
0 mW     0.0%   Thinkpad light
0 mW     0.0%   USB device: EHCI Host Controller
0 mW     0.0%   USB device: usb-device-8087-0024
0 mW     0.0%   Audio codec hwC0D3: Intel
100.0%  PCI Device: Ricoh Co Ltd MMC/SD Host Controller
100.0%  PCI Device: Intel Corporation Centrino Advanced-N 6205 [Taylor Peak]
100.0%  PCI Device: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller
100.0%  PCI Device: Intel Corporation 6 Series/C200 Series Chipset Family 6 port SATA AHCI Controller
100.0%  PCI Device: Intel Corporation QM67 Express Chipset Family LPC Controller
100.0%  PCI Device: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1
100.0%  PCI Device: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 5
100.0%  PCI Device: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 2
100.0%  PCI Device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller
100.0%  PCI Device: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1
100.0%  PCI Device: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller
0.0%    PCI Device: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1
0.0%    PCI Device: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2
0.0%    PCI Device: Intel Corporation 2nd Generation Core Processor Family DRAM Controller

And the question: How do I get it to stay at the low mode every time?

share|improve this question

1 Answer 1

Try

\>rfkill list
0: tpacpi_bluetooth_sw: Bluetooth
        Soft blocked: yes
        Hard blocked: no
1: tpacpi_wwan_sw: Wireless WAN
        Soft blocked: yes
        Hard blocked: no
10: phy1: Wireless LAN
        Soft blocked: no
        Hard blocked: no

Then switch the Radio WAN device with:

rfkill block 1
share|improve this answer
    
Hmm, as I see this, this would softwareblock an already blocked device, why would I want to to this? –  Gunnish Mar 4 at 19:28
    
4.96 W 100.0% Radio device: iwlwifi –  azul Mar 5 at 20:13

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.