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I have experienced a strange error a month ago when Ubuntu 14.10
upgraded the linux kernel. rtl8192cu fixed driver stopped working. The
error is mentioned here:
http://askubuntu.com/questions/546195/ubuntu-14-10-rtl8192cu-
bug/609057#609057

The kernel 3.16.0-33-generic (maybe also some older) had this error and
an update from 3.16.0-33-generic to 3.16.0-34-generic fixed the issue.

Identical issue popped up again with a kernel update in Ubuntu 15.04
from 3.19.0-15 to 3.19.0-16. The following lines appear in the syslog
all the time and the wireless connection is not working:

May  8 08:01:20 computer NetworkManager[969]: <info> (wlan4): supplicant interface state: associating -> disconnected
May  8 08:01:20 computer NetworkManager[969]: <info> (wlan4): supplicant interface state: disconnected -> scanning
May  8 08:01:21 computer kernel: [70436.589191] survey done event(1c) band:0 for wlan4
May  8 08:01:24 computer kernel: [70439.508489] ==>rtw_ps_processor .fw_state(8)
May  8 08:01:24 computer kernel: [70439.508494] ==>ips_enter cnts:952
May  8 08:01:24 computer kernel: [70439.508496] ===> rtw_ips_pwr_down...................
May  8 08:01:24 computer kernel: [70439.508959] ====> rtw_ips_dev_unload...
May  8 08:01:24 computer kernel: [70439.532197] usb_read_port_cancel
May  8 08:01:24 computer kernel: [70439.532398] usb_read_port_complete()-1284: RX Warning! bDriverStopped(0) OR bSurpriseRemoved(0) bReadPortCancel(1)
May  8 08:01:24 computer kernel: [70439.532669] usb_read_port_complete()-1284: RX Warning! bDriverStopped(0) OR bSurpriseRemoved(0) bReadPortCancel(1)
May  8 08:01:24 computer kernel: [70439.532898] usb_read_port_complete()-1284: RX Warning! bDriverStopped(0) OR bSurpriseRemoved(0) bReadPortCancel(1)
May  8 08:01:24 computer kernel: [70439.533149] usb_read_port_complete()-1284: RX Warning! bDriverStopped(0) OR bSurpriseRemoved(0) bReadPortCancel(1)
May  8 08:01:24 computer kernel: [70439.533207] usb_write_port_cancel 
May  8 08:01:24 computer kernel: [70439.533222] ==> rtl8192cu_hal_deinit 
May  8 08:01:24 computer kernel: [70439.533224] bkeepfwalive(0)
May  8 08:01:24 computer kernel: [70439.533225] card disble without HWSM...........
May  8 08:01:24 computer kernel: [70439.538277] <=== rtw_ips_pwr_down..................... in 28ms
May  8 08:01:26 computer kernel: [70441.592759] _rtw_pwr_wakeup call ips_leave....
May  8 08:01:26 computer kernel: [70441.592765] ==>ips_leave cnts:952
May  8 08:01:26 computer kernel: [70441.592766] ===>  rtw_ips_pwr_up..............
May  8 08:01:26 computer kernel: [70441.592770] ===> ips_netdrv_open.........
May  8 08:01:26 computer kernel: [70441.597595]  ===> FirmwareDownload91C() fw:Rtl819XFwImageArray_TSMC
May  8 08:01:26 computer kernel: [70441.597599] FirmwareDownload92C accquire FW from embedded image
May  8 08:01:26 computer kernel: [70441.597602] fw_ver=v88, fw_subver=2, sig=0x88c0
May  8 08:01:26 computer kernel: [70441.622978] fw download ok!
May  8 08:01:26 computer kernel: [70441.622981] Set RF Chip ID to RF_6052 and RF type to 2.
May  8 08:01:27 computer kernel: [70442.002524] IQK:Start!!!
May  8 08:01:27 computer kernel: [70442.014279] Path A IQK Success!!
May  8 08:01:27 computer kernel: [70442.019030] Path B IQK Success!!
May  8 08:01:27 computer kernel: [70442.027535] Path A IQK Success!!
May  8 08:01:27 computer kernel: [70442.032330] Path B IQK Success!!
May  8 08:01:27 computer kernel: [70442.044917] Path A IQK Success!!
May  8 08:01:27 computer kernel: [70442.049671] Path B IQK Success!!
May  8 08:01:27 computer kernel: [70442.054424] IQK: final_candidate is 1
May  8 08:01:27 computer kernel: [70442.054428] IQK: RegE94=100 RegE9C=3f9 RegEA4=fc RegEAC=3ff RegEB4=101 RegEBC=8 RegEC4=fe RegECC=1
May  8 08:01:27 computer kernel: [70442.054428]  Path A IQ Calibration Success !
May  8 08:01:27 computer kernel: [70442.056546] Path B IQ Calibration Success !
May  8 08:01:27 computer kernel: [70442.169850] pdmpriv->TxPowerTrackControl = 1
May  8 08:01:27 computer kernel: [70442.174477] rtl8192cu_hal_init in 584ms
May  8 08:01:27 computer kernel: [70442.187114] <===  rtw_ips_pwr_up.............. in 596ms
May  8 08:01:27 computer kernel: [70442.187233] ==> ips_leave.....LED(0x00028080)...
May  8 08:01:28 computer kernel: [70443.496206] survey done event(1e) band:0 for wlan4
May  8 08:01:29 computer kernel: [70444.190567] ==>rtw_ps_processor .fw_state(8)
May  8 08:01:29 computer kernel: [70444.190572] ==>ips_enter cnts:953
May  8 08:01:29 computer kernel: [70444.190574] ===> rtw_ips_pwr_down...................
May  8 08:01:29 computer kernel: [70444.190825] ====> rtw_ips_dev_unload...
May  8 08:01:29 computer kernel: [70444.214200] usb_read_port_cancel
May  8 08:01:29 computer kernel: [70444.214400] usb_read_port_complete()-1284: RX Warning! bDriverStopped(0) OR bSurpriseRemoved(0) bReadPortCancel(1)
May  8 08:01:29 computer kernel: [70444.214650] usb_read_port_complete()-1284: RX Warning! bDriverStopped(0) OR bSurpriseRemoved(0) bReadPortCancel(1)
May  8 08:01:29 computer kernel: [70444.214901] usb_read_port_complete()-1284: RX Warning! bDriverStopped(0) OR bSurpriseRemoved(0) bReadPortCancel(1)
May  8 08:01:29 computer kernel: [70444.215150] usb_read_port_complete()-1284: RX Warning! bDriverStopped(0) OR bSurpriseRemoved(0) bReadPortCancel(1)
May  8 08:01:29 computer kernel: [70444.215194] usb_write_port_cancel 

Obviously the patches applied in 3.16.0-34-generic shall be applied to
3.19.0-16-generic again.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: kernel-bug wireless
-- 
Kernel drops connection with rtl8192cu fixed driver
https://bugs.launchpad.net/bugs/1453028
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