Re: tr: Re: info about D-link USB wlan with realtek RTL8192SU

[Larry Finger <Larry.Finger@lwfinger.net>]

On 04/13/2012 04:50 PM, Cédric MARTIN wrote:
>>> I'm sorry ton contact you, because I think you have hundred of email like this,
>>> but I think you're the right person to give me some advices.
>>> I'm beginner in Gnu/linux world as User.
>>>
>>> I use a PC with openelec distri (home theater distribution, *OpenELEC 1.0
>>> (stable)* - 1.0.2
>>>   Intel x86_64
>>> (90 MB)) and I have problem with my wlan.
>>> I have aleatory connection.
>>>
>>> a lsusb give me this:
>>>
>>> "...
>>> Bus 002 Device 006: ID 07d1:3303 D-Link System DWA-131 802.11n Wireless N Nano
>>> Adapter(rev.A1) [Realtek RTL8192SU]"
>>>
>>> It seem ok.
>>>
>>> a lsmod give me this:
>>>
>>> "
>>> root ~ # lsmod
>>> Module Size Used by
>>> snd_hda_codec_hdmi 22001 1
>>> snd_hda_codec_realtek 274159 1
>>> snd_hda_intel 21531 3
>>> snd_hda_codec 73098 3 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel
>>> snd_hwdep 5108 1 snd_hda_codec
>>> snd_pcm 59142 4 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
>>> snd_timer 17314 2 snd_pcm
>>> snd 44263 11
>>> snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_timer
>>> ftdi_sio 32206 1
>>> r8712u 156717 0
>>> snd_page_alloc 6753 2 snd_hda_intel,snd_pcm
>>> usbserial 28127 3 ftdi_sio
>>> coretemp 5979 0
>>> "
>>> a dmesg give me this:
>>>
>>> "
>>> ...[ 5.745226] r8712u: module is from the staging directory, the quality is
>>> unknown, you have been warned.
>>> [ 5.745750] r8712u: DriverVersion: v7_0.20100831
>>> [ 5.745761] r8712u: register rtl8712_netdev_ops to netdev_ops
>>> [ 5.745763] r8712u: USB_SPEED_HIGH with 4 endpoints
>>> [ 5.746286] r8712u: Boot from EFUSE: Autoload OK
>>> [ 5.746449] USB Serial support registered for FTDI USB Serial Device
>>> [ 5.746490] ftdi_sio 2-1.4.1:1.0: FTDI USB Serial Device converter detected
>>> [ 5.746532] usb 2-1.4.1: Detected FT232RL
>>> [ 5.746535] usb 2-1.4.1: Number of endpoints 2
>>> [ 5.746536] usb 2-1.4.1: Endpoint 1 MaxPacketSize 64
>>> [ 5.746538] usb 2-1.4.1: Endpoint 2 MaxPacketSize 64
>>> [ 5.746539] usb 2-1.4.1: Setting MaxPacketSize 64
>>> [ 5.747002] usb 2-1.4.1: FTDI USB Serial Device converter now attached to ttyUSB0
>>> [ 5.747021] usbcore: registered new interface driver ftdi_sio
>>> [ 5.747023] ftdi_sio: v1.6.0:USB FTDI Serial Converters Driver
>>> [ 6.104736] snd_hda_intel 0000:00:1b.0: PCI INT A ->  GSI 22 (level, low) ->  IRQ 22
>>> [ 6.104787] snd_hda_intel 0000:00:1b.0: irq 42 for MSI/MSI-X
>>> [ 6.104831] snd_hda_intel 0000:00:1b.0: setting latency timer to 64
>>> [ 6.327161] r8712u: CustomerID = 0x0000
>>> [ 6.327164] r8712u: MAC Address from efuse = fc:75:16:6d:f3:b1
>>> [ 6.327420] usbcore: registered new interface driver r8712u
>>> ...
>>> [ 22.465242] r8712u: Loading firmware from "rtlwifi/rtl8712u.bin"
>>> [ 23.150858] r8712u: 1 RCR=0x153f00e
>>> [ 23.151818] r8712u: 2 RCR=0x553f00e
>>> [ 23.260743] ADDRCONF(NETDEV_UP): wlan0: link is not ready

I have no knowledge of the openELEC distro, or more precisely, what kernel they 
are using, but r8712u works very well with current kernels such as 3.4-rc3. 
There were some changes added between 3.1 and 3.2 that caused problems with some 
distros - Arch and Debian were two of them. If yours is Debian based, then it is 
probably affected. Those problems were fixed and have been added to the latest 
releases of stable kernels.

In short, you probably need to upgrade your kernel.

Larry