On 08/30/2012 10:14 PM, Cliff McDiarmid wrote:
> Hi
>
> I wonder whether one of you can help me with a usb wireless issue?  I'm
> running LFS 6.2 and want to connect a wired usb receiver with a Realtek
> 8188SU chip.  There is a driver from Realtek which I have compiled and
> the device is seen.   When I turn off my built-in receiver in the laptop
> the device will scan and find my normal wireless hub, but wpa_supplicant
> will not connect(already tried wicd - gives 'bad password', went manual).
>

I don't know if that LFS is too old, but since you say it runs, I guess 
it is not old.

Your problem might be related to this:

  SIOCSIFFLAGS: Operation not possible due to RF-kill

There are two types of RF-kill ... Soft and Hard type.

Hard type means it is hardware blocked. Most laptops have hardware 
switches/buttons that turn wifi on/off. But since that is an usb chip, I 
doubt that ...

Soft type is software blocked and it is done within kernel itself.

You can use this simple tool to check wether your wireless is soft or 
hard blocked. It also can unblock soft-blocked chip.

http://linuxwireless.org/download/rfkill/

Just use ussual build instructions, no additional deps except kernel and 
compiler are needed from what I know.

Just a note ... Hard block can occour if firmware is missing, and iirc, 
rtl_wifi needs firmware.

I am not sure tough for the driver downloaded from their site, but one 
in the mainline kernel needs firmware from linux-firmware git repository 
at kernel.org

https://git.kernel.org/?p=linux/kernel/git/dwmw2/linux-firmware.git
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