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I have been trying to establish wireless connection for a week now, and I visited countless number of posts, but to my embarassment, I cannot seem to figure out how to make this working.
This is my progress so far.
I tried working with the default linux kernel module, but when that didn't work, I installed dkms-8192cu module at AUR as suggested, and updated with pacman.
I blacklisted rtl8192, rtlwifi, and rtl8192cu, and listed it under FILE in /etc/mkinitcpio.conf.
Then I did sudo modprobe 8192cu and reboot to make sure lsmod only shows 8192cu, not rtl8192cu, although mkinitcpio -M still shows rtl8192cu.
I did "ip link set wifi0 up" and tried "wpa_supplicant -d -i wifi0 -c /etc/wpa_supplicant/wpa_supplicant.conf" of which I got erorrs:
wpa_supplicant v2.1
Successfully initialized wpa_supplicant
Initializing interface 'wifi0' conf '/etc/wpa_supplicant/wpa_supplicant.conf' driver 'default' ctrl_interface 'N/A' bridge 'N/A'
Configuration file '/etc/wpa_supplicant/wpa_supplicant.conf' -> '/etc/wpa_supplicant/wpa_supplicant.conf'
Reading configuration file '/etc/wpa_supplicant/wpa_supplicant.conf'
Priority group 0
id=0 ssid='Don LAN'
nl80211: Could not add multicast membership for vendor events: -2 (No such file or directory)
nl80211: Driver does not support authentication/association or connect commands
nl80211: Remove monitor interface: refcount=0
netlink: Operstate: ifindex=3 linkmode=0 (kernel-control), operstate=6 (IF_OPER_UP)
nl80211: Set mode ifindex 3 iftype 2 (STATION)
nl80211: Failed to set interface 3 to mode 2: -19 (No such device)
wifi0: Failed to initialize driver interface
Failed to add interface wifi0
wifi0: Cancelling scan request
wifi0: Cancelling authentication timeout
My apology if I am missing something really simple, but because I tried so much things, I am confused to where to look anymore.
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I was trying to get this to work for a year with just wpa_supplicant, with no success(in kernel driver or driver from realtek). The people who had success all seemed to be using Network Manager to set up wifi, which I don't use and never tried, maybe it works for you? My solution (I know not the solution you are looking for) was to get a different device: http://www.amazon.com/Onkyo-UWF-1-Wirel … =onkyo+usb which has an atheros chip set, ath9k_htc module.
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I tried wifi-menu when everything failed, but still it didn't work, probably because I haven't solved wpa_supplicant issue first. Anyways, the reason why I think the problem is with my configuration and not with the adapter is because I have used it well with my Raspberry Pi. I guess if everything fails, new adapter is the only solution I will have to accept.
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You could try downgrading your kernel to 3.10 to match the Pi, the 8192cu chips and drivers seemed to work better with the older kernels. Also I think Network Manager does not use wpa_supplicant to manage wifi, so may work when other options don't. Larry Finger is the kernel dev working on this and I found once on the mailing lists that he had 8192cu working and appeared to use Network Manager. Sorry was not able to find that specific message again. You can try searching the kernel mailing lists and bug reports, references include 8192cu and rtlwifi, for more information.
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