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I'm getting serious power drain from the wireless interface on my Lenovo X230. Powertop reports between 5 and 7W.
My wireless card is an Intel Centrino-N 2200:
# lspci | grep 'Network controller'
03:00.0 Network controller: Intel Corporation Centrino Wireless-N 2200 (rev c4)
I'm running the latest Con Kolivas 3.16 kernel
# uname -a
Linux pnut 3.16.6-3-ck #1 SMP PREEMPT Wed Oct 22 21:33:53 EDT 2014 x86_64 GNU/Linux
I've tried the stock kernel as well, and it has the same effect.
I've disabled 802.11n
# cat /sys/module/iwlwifi/parameters/11n_disable
1
Wireless power savings is on
# iw dev wlp3s0 get power_save
Power save: on
The power drain seems to have gotten significantly worse recently, because I remember it being closer half a watt in the past. Perhaps a kernel or driver update was responsible? Is there anything else I should be looking at?
Thanks.
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This is pretty much what I've always seen (Lenovo Yoga 2 Pro w. Intel wireless-N, currently linux 3.17.1-1, power management on):
PowerTOP 2.6.1 Overview Idle stats Frequency stats Device stats Tunables
The battery reports a discharge rate of 8.78 W
The estimated remaining time is 4 hours, 41 minutes
Summary: 293.1 wakeups/second, 9.9 GPU ops/seconds, 0.0 VFS ops/sec and 4.4% CPU use
Power est. Usage Events/s Category Description
5.90 W 12.7 pkts/s Device Network interface: wlp1s0 (iwlwifi)
3.86 W 100.0% Device USB device: USB Receiver (Logitech)
614 mW 58.0% Device Display backlight
517 mW 12.5 ms/s 90.6 Process /usr/bin/Xorg.bin <snip>A little puzzling, admittedly:
- the power-hungry (relative to what it's accomplishing) Logitech wireless mouse receiver, and
- the fact that the top two consumption rates add up to more than the total consumption rate.
Enough is more.
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If anyone is following along or experiencing the same issue, I downloaded and compiled the 3.14.23-1-lts-ck kernel, and now my network interface is using half a Watt. I don't know if it's due to the version or some compilation flat, but this is definitely kernel related.
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