On Sat, 23 May 2015 12:40:38 +0200
Michael Büsch <m@bues.ch> wrote:

> I will also try your driver from your github repo soon and see if that makes it work.

Oh well. To put it mildly, this driver is awful.
It compiles with frightening array overrun warnings in rtl8192c_rf6052.c, on load spews a ton of messages and then replies to a scan request with:

root@milhouse:~# ip link set up dev wlan4
root@milhouse:~# iwlist wlan4 scan
wlan4     Interface doesn't support scanning.

root@milhouse:~# iw dev wlan4 scan
command failed: No such device (-19)


Stand clear, here come the messages:

[ 3973.868312] rtl8192cu driver version=v4.0.2_9000.20130911
[ 3973.868453] usbcore: registered new interface driver rtl8192cu
[ 4028.492113] usb 1-2: new high-speed USB device number 6 using ehci-pci
[ 4028.625897] usb 1-2: New USB device found, idVendor=7392, idProduct=7811
[ 4028.625912] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 4028.625921] usb 1-2: Product: 802.11n WLAN Adapter
[ 4028.625930] usb 1-2: Manufacturer: Realtek
[ 4028.625938] usb 1-2: SerialNumber: xxx
[ 4028.626959] 
               usb_endpoint_descriptor(0):
[ 4028.626976] bLength=7
[ 4028.626983] bDescriptorType=5
[ 4028.626991] bEndpointAddress=81
[ 4028.626998] wMaxPacketSize=200
[ 4028.627004] bInterval=0
[ 4028.627011] RT_usb_endpoint_is_bulk_in = 1
[ 4028.627017] 
               usb_endpoint_descriptor(1):
[ 4028.627026] bLength=7
[ 4028.627032] bDescriptorType=5
[ 4028.627038] bEndpointAddress=2
[ 4028.627044] wMaxPacketSize=200
[ 4028.627050] bInterval=0
[ 4028.627056] RT_usb_endpoint_is_bulk_out = 2
[ 4028.627063] 
               usb_endpoint_descriptor(2):
[ 4028.627073] bLength=7
[ 4028.627080] bDescriptorType=5
[ 4028.627087] bEndpointAddress=3
[ 4028.627095] wMaxPacketSize=200
[ 4028.627102] bInterval=0
[ 4028.627108] RT_usb_endpoint_is_bulk_out = 3
[ 4028.627115] 
               usb_endpoint_descriptor(3):
[ 4028.627126] bLength=7
[ 4028.627133] bDescriptorType=5
[ 4028.627141] bEndpointAddress=84
[ 4028.627147] wMaxPacketSize=40
[ 4028.627154] bInterval=1
[ 4028.627162] RT_usb_endpoint_is_int_in = 4, Interval = 1
[ 4028.627171] nr_endpoint=4, in_num=2, out_num=2

[ 4028.627182] USB_SPEED_HIGH
[ 4028.627240] CHIP TYPE: RTL8188C_8192C
[ 4028.627274] register rtw_netdev_ops to netdev_ops
[ 4028.627415] Chip Version ID: VERSION_NORMAL_TSMC_CHIP_88C.
[ 4028.627428] RF_Type is 3!!
[ 4028.627768] EEPROM type is E-FUSE
[ 4028.627780] ====> ReadAdapterInfo8192C
[ 4028.627898] Boot from EFUSE, Autoload OK !
[ 4028.778757] EEPROMVID = 0x7392
[ 4028.778765] EEPROMPID = 0x7811
[ 4028.778769] EEPROMCustomerID : 0x00
[ 4028.778773] EEPROMSubCustomerID: 0x00
[ 4028.778777] RT_CustomerID: 0x00
[ 4028.778784] _ReadMACAddress MAC Address from EFUSE = xxx
[ 4028.778790] EEPROMRegulatory = 0x0
[ 4028.778794] _ReadBoardType(0)
[ 4028.778799] BT Coexistance = disable
[ 4028.778804] mlmepriv.ChannelPlan = 0x02
[ 4028.778809] _ReadPSSetting...bHWPwrPindetect(0)-bHWPowerdown(0) ,bSupportRemoteWakeup(0)
[ 4028.778813] ### PS params=>  power_mgnt(1),usbss_enable(0) ###
[ 4028.778817] ### AntDivCfg(0)
[ 4028.778821] readAdapterInfo_8192CU(): REPLACEMENT = 1
[ 4028.778826] <==== ReadAdapterInfo8192C in 152 ms
[ 4028.779451] rtw_macaddr_cfg MAC Address  = xxx
[ 4028.779461] bDriverStopped:1, bSurpriseRemoved:0, bup:0, hw_init_completed:0
[ 4028.780924] _rtw_drv_register_netdev, MAC Address (if1) = xxx
[ 4029.844223] rtl8192cu 1-2:1.0 wlan4: renamed from wlan1
[ 4029.872791] systemd-udevd[30617]: renamed network interface wlan1 to wlan4
[ 4032.495346] +871x_drv - drv_open, bup=0
[ 4032.499722]  ===> FirmwareDownload91C() fw:Rtl819XFwImageArray_TSMC
[ 4032.499737] FirmwareDownload92C accquire FW from embedded image
[ 4032.499746] fw_ver=v88, fw_subver=2, sig=0x88c0
[ 4032.532832] fw download ok!
[ 4032.532841] Set RF Chip ID to RF_6052 and RF type to 1T1R.
[ 4032.906818] IQK:Start!!!
[ 4032.918190] Path A IQK Success!!
[ 4032.926443] Path A IQK Success!!
[ 4032.931584] IQK: final_candidate is 0
[ 4032.931595] IQK: RegE94=106 RegE9C=13 RegEA4=fd RegEAC=3fd RegEB4=0 RegEBC=0 RegEC4=0 RegECC=0
                Path A IQ Calibration Success !
[ 4033.043931] pdmpriv->TxPowerTrackControl = 1
[ 4033.048684] rtl8192cu_hal_init in 556ms
[ 4033.061576] MAC Address = xxx
[ 4033.061789] -871x_drv - drv_open, bup=1
[ 4033.062150] IPv6: ADDRCONF(NETDEV_UP): wlan4: link is not ready
[ 4035.068534] ==>rtw_ps_processor .fw_state(0)
[ 4035.068546] ==>ips_enter cnts:1
[ 4035.068552] ===> rtw_ips_pwr_down...................
[ 4035.068771] ====> rtw_ips_dev_unload...
[ 4035.092200] usb_read_port_cancel
[ 4035.092508] usb_read_port_complete()-1284: RX Warning! bDriverStopped(0) OR bSurpriseRemoved(0) bReadPortCancel(1)
[ 4035.092761] usb_read_port_complete()-1284: RX Warning! bDriverStopped(0) OR bSurpriseRemoved(0) bReadPortCancel(1)
[ 4035.092998] usb_read_port_complete()-1284: RX Warning! bDriverStopped(0) OR bSurpriseRemoved(0) bReadPortCancel(1)
[ 4035.093247] usb_read_port_complete()-1284: RX Warning! bDriverStopped(0) OR bSurpriseRemoved(0) bReadPortCancel(1)
[ 4035.093263] usb_write_port_cancel 
[ 4035.093315] ==> rtl8192cu_hal_deinit 
[ 4035.093319] bkeepfwalive(0)
[ 4035.093323] card disble without HWSM...........
[ 4035.098401] <=== rtw_ips_pwr_down..................... in 28ms



If you want to have this device, I'll ship it to you for free.

-- 
Michael