Arch Linux

erkana

Member

Registered: 2016-04-29

Posts: 8

Card Reader using over 6W power

Hello guys,

I am checking powertop to see and optimize details for battery usage and it is interesting to see a card reader which I don't use at all is draining the battery.

The battery reports a discharge rate of 9.48 W
The power consumed was 270 J
The estimated remaining time is 2 hours, 23 minutes

Summary: 1164.0 wakeups/second,  50.9 GPU ops/seconds, 0.0 VFS ops/sec and 18.0% CPU use

Power est.              Usage       Events/s    Category       Description
  6.45 W     82.6%                      Device         USB device: USB2.0-CRW (Generic)
  996 mW     51.9%                      Device         Display backlight

lsusb reports the device

[erkan@gl62 ~]$ lsusb
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 0bda:0129 Realtek Semiconductor Corp. RTS5129 Card Reader Controller
Bus 001 Device 002: ID 8087:0a2a Intel Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

How can I completely power it off permanently?

R00KIE

Forum Fellow

From: Between a computer and a chair

Registered: 2008-09-14

Posts: 4,734

Re: Card Reader using over 6W power

That is an estimate and if following the usb spec to the letter it should not even be possible for a usb2 port. I suppose powertop might have/suggest some tunable that might make the card reader sleep when not in use.

---

R00KIE
Tm90aGluZyB0byBzZWUgaGVyZSwgbW92ZSBhbG9uZy4K