Raspberry Pi Forums

Posted: **Mon May 27, 2013 2:04 pm**

I am having a strange issue where after maybe about 5 minutes of using wifi (about 5-6meg a sec worth of traffic). The wifi cuts out and will work if i replug the usb only for a moment then again will just cut out. Its a very annoying problem.

Anyone know how i can fix this?

I am using:
Raspberry Pi (512MB RAM)
Powered USB Hub
TP-Link TL-WN821N

Posted: **Tue May 28, 2013 4:10 pm**

Please give us the output of lsusb for your device. I make a guess that it works with the annoying realtek 8192cu driver. You could check if the module is loaded with

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# lsmod | grep 8192cu

If it is, maybe this post will enlight you http://www.raspberrypi.org/phpBB3/viewt ... 19#p353919

Suffering the same issue,
Homer

Posted: **Wed May 29, 2013 6:33 am**

So i ran lsmod, there was no 8192cu.

ath9k_htc, ath9k_common, ath9k_hw, ath were there i assuming these are the wifi drivers.

Posted: **Wed May 29, 2013 7:08 am**

Yes -- those are drivers for Atheros wireless adapters.

Anything useful in dmesg or /var/log/ ?

Dave Driesen
Linux dev and oldskool elite

Posted: **Wed May 29, 2013 7:18 am**

So tried turning power saving off as mentioned in another thread this didn't help, i am combing through dmesg now found this a lot

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[   81.334868] usb 1-1.3.4: device descriptor read/64, error -71
[   81.524764] usb 1-1.3.4: device descriptor read/64, error -71
[   81.714912] usb 1-1.3.4: new high-speed USB device number 28 using dwc_otg
[   82.134674] usb 1-1.3.4: device not accepting address 28, error -71
[   82.214871] usb 1-1.3.4: new high-speed USB device number 29 using dwc_otg
[   82.634697] usb 1-1.3.4: device not accepting address 29, error -71

Here is a screenshot of some of the wifi usb doing whatever its doing haha

Didn't see much else that looked to interesting.

Posted: **Wed May 29, 2013 7:34 pm**

Would be interested to see if the fiq_split branch makes any difference to this...

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sudo BRANCH=fiq_split rpi-update

Gordon

Posted: **Fri May 31, 2013 8:53 am**

will try it out.

Posted: **Fri May 31, 2013 9:08 am**

Seems to be working alright, i don't seem to have wifi drivers or something though. The pi detects my usb but there is no wlan0

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