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Fix problem with 8192cu wireless chip (solution included) #217

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BartOtten opened this Issue Jan 11, 2013 · 8 comments

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BartOtten commented Jan 11, 2013

Source: http://forum.xbian.org/thread-37-post-2088.html#pid2088

The 8192cu wireless chip found in many wifi dongles on ebay (mine is Edup) has some power issues with raspberry pi. Mine was repeatedly disconnecting and going into saving mode or something even thought it dosne't really have power management features.

You have to create a file:

sudo nano /etc/modprobe.d/8192cu.conf

and add this line:

# Disable power saving
options 8192cu rtw_power_mgnt=0

save and reboot.

you can check the status if it is off:

cat /sys/module/8192cu/parameters/rtw_power_mgnt

it should be 0 now.

@ghost ghost assigned Koenkk Jan 11, 2013

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Koenkk commented Jan 11, 2013

A lot of forums/blogs say you also have to add rtw_enusbss=0, so the whole line would be options 8192cu rtw_power_mgnt=0 rtw_enusbss=0 Sources: http://svay.com/blog/setting-up-a-wifi-connection-on-the-raspberrypi/, http://forum.doozan.com/read.php?6,8618,8938,quote=1, http://jas-hacks.blogspot.nl/2012/09/hackberry-wireless-access-point.html. However I don't know what rtw_enusbss=0 exactly does.

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CurlyMoo commented Jan 11, 2013

@BartOtten, can you first fix the markup of your post?

Koenkk added a commit that referenced this issue Jan 11, 2013

@Koenkk Koenkk closed this Jan 11, 2013

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metachris commented Jan 31, 2013

fyi: rtw_enusbss=0 disables USB autosuspend.

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Koenkk commented Jan 31, 2013

Where do we need to put that?

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CurlyMoo commented Jan 31, 2013

I saw it was already there.

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metachris commented Feb 1, 2013

To permanently disable the power management, you'll need to add this line to your module options file:

options 8192cu rtw_power_mgnt=0 rtw_enusbss=0

In Gentoo that file would be called /etc/modprobe.d/8192cu.conf.

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CurlyMoo commented Feb 1, 2013

Like i said, it is already there so...

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thayoz commented Jan 28, 2016

Thanks a lot for the fix !

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