I am running arch linux on my pi.
My wifi adapter:

  Edimax Technology Co., Ltd EW-7811Un 802.11n Wireless Adapter [Realtek RTL8188CUS]

On the power front, 12W ipad adapter.

My suspicion was the "power saving feature" of the device. So I created an config file for the module in /etc/modprobe.d/ which disables power saving. It didn't work :(

  options 8192cu rtw_power_mgnt=0
  • I also have this chipset (RTL8188CUS, TP-Link TL-WN725N) and noticed that the Pi would reset upon plugging in this adapter. Using the adapter included by RS Components. – Lekensteyn Aug 2 '13 at 9:49
  • It resets? The adapter I have works for a couple of mins to a few hours. Then the led is just stable (Its blinks when there is some activity) . I can't ssh to the machine or anything. I am thinking of adding a cron job so that it pings the router every few mins or so. – feverDream Aug 2 '13 at 10:42
  • 1
    Yes, it reboots (due to the power flux?). What would the cron be good for? I suggest you to setup syslog and have a look in /var/log/. You might also be able to use journalctl -ab if the Pi has not reset (thereby losing logs) – Lekensteyn Aug 2 '13 at 11:07
  • The device I use is not connected to a display. So I am assuming that the pi is running and the wifi-adapter is not. I was under the impression that the adapter just shuts off due to inactivity. Hence the cron job. – feverDream Aug 2 '13 at 11:18
  • You can also SSH over Ethernet? Or do you have Model A? If PM is disabled, then the adapter will not go to sleep. – Lekensteyn Aug 2 '13 at 13:58

To disable power saving mode, you have to add "wireless-power off" in your "interfaces" file

1/ Type

sudo nano /etc/network/interfaces

2/ Add at the end of file

wireless-power off

3/ Reboot by typing :

sudo reboot
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