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?
