Proposed fix works for xenial

** Tags removed: verification-needed-xenial
** Tags added: verification-done-xenial

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https://bugs.launchpad.net/bugs/1666421

Title:
  kernel 4.4.0-63 with USB WLAN RTL8192CU freezes desktop

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Xenial:
  Fix Committed
Status in linux source package in Yakkety:
  Fix Committed

Bug description:
  booting PC with USB WLAN stick RTL8192CU attached on kernel 4.4.0-63-generic:
  Grub works, entering full disk encryption passphrase works, but when the 
desktop comes up mouse and keyboard (via USB) are dead and the desktop also.

  booting the PC without the stick attached works fine, but as soon as
  it is attached (see syslog) mouse, keyboard and the desktop itself are
  dead (checked by opening terminal and "watch date" - freezes, with
  desktop still visible).

  problem is resolved by booting former kernel 4.4.0-59-generic.

  syslog upon attaching stick 
---------------------------------------------------
  Feb 21 07:17:02 orin kernel: [  188.998338] usb 8-2: new high-speed USB 
device number 2 using xhci_hcd
  Feb 21 07:17:02 orin kernel: [  189.129674] usb 8-2: New USB device found, 
idVendor=0bda, idProduct=8178
  Feb 21 07:17:02 orin kernel: [  189.129682] usb 8-2: New USB device strings: 
Mfr=1, Product=2, SerialNumber=3
  Feb 21 07:17:02 orin kernel: [  189.129687] usb 8-2: Product: USB WLAN
  Feb 21 07:17:02 orin kernel: [  189.129691] usb 8-2: Manufacturer: Realtek
  Feb 21 07:17:02 orin kernel: [  189.129694] usb 8-2: SerialNumber: 
00e04c000001
  Feb 21 07:17:02 orin mtp-probe: checking bus 8, device 2: 
"/sys/devices/pci0000:00/0000:00:10.1/usb8/8-2"
  Feb 21 07:17:02 orin mtp-probe: bus: 8, device: 2 was not an MTP device
  Feb 21 07:17:02 orin dbus[1112]: [system] Activating via systemd: service 
name='org.freedesktop.UDisks2' unit='udisks2.service'
  Feb 21 07:17:02 orin systemd[1]: Starting Disk Manager...
  Feb 21 07:17:02 orin udisksd[2447]: udisks daemon version 2.1.7 starting
  Feb 21 07:17:02 orin dbus[1112]: [system] Successfully activated service 
'org.freedesktop.UDisks2'
  Feb 21 07:17:02 orin systemd[1]: Started Disk Manager.
  Feb 21 07:17:02 orin udisksd[2447]: Acquired the name org.freedesktop.UDisks2 
on the system message bus
  Feb 21 07:17:02 orin org.gtk.vfs.AfcVolumeMonitor[1918]: Volume monitor alive
  Feb 21 07:17:03 orin kernel: [  190.200286] cfg80211: World regulatory domain 
updated:
  Feb 21 07:17:03 orin kernel: [  190.200294] cfg80211:  DFS Master region: 
unset
  Feb 21 07:17:03 orin kernel: [  190.200297] cfg80211:   (start_freq - 
end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)
  Feb 21 07:17:03 orin kernel: [  190.200303] cfg80211:   (2402000 KHz - 
2472000 KHz @ 40000 KHz), (N/A, 2000 mBm), (N/A)
  Feb 21 07:17:03 orin kernel: [  190.200308] cfg80211:   (2457000 KHz - 
2482000 KHz @ 40000 KHz), (N/A, 2000 mBm), (N/A)
  Feb 21 07:17:03 orin kernel: [  190.200312] cfg80211:   (2474000 KHz - 
2494000 KHz @ 20000 KHz), (N/A, 2000 mBm), (N/A)
  Feb 21 07:17:03 orin kernel: [  190.200317] cfg80211:   (5170000 KHz - 
5250000 KHz @ 80000 KHz, 160000 KHz AUTO), (N/A, 2000 mBm), (N/A)
  Feb 21 07:17:03 orin kernel: [  190.200321] cfg80211:   (5250000 KHz - 
5330000 KHz @ 80000 KHz, 160000 KHz AUTO), (N/A, 2000 mBm), (0 s)
  Feb 21 07:17:03 orin kernel: [  190.200325] cfg80211:   (5490000 KHz - 
5730000 KHz @ 160000 KHz), (N/A, 2000 mBm), (0 s)
  Feb 21 07:17:03 orin kernel: [  190.200329] cfg80211:   (5735000 KHz - 
5835000 KHz @ 80000 KHz), (N/A, 2000 mBm), (N/A)
  Feb 21 07:17:03 orin kernel: [  190.200333] cfg80211:   (57240000 KHz - 
63720000 KHz @ 2160000 KHz), (N/A, 0 mBm), (N/A)
  Feb 21 07:17:03 orin kernel: [  190.223081] rtl8192cu: Chip version 0x11
  Feb 21 07:17:03 orin kernel: [  190.625235] rtl8192cu: MAC address: 
14:cc:20:10:43:98
  Feb 21 07:17:03 orin kernel: [  190.625241] rtl8192cu: Board Type 0
  Feb 21 07:17:03 orin kernel: [  190.626355] rtl_usb: rx_max_size 15360, 
rx_urb_num 8, in_ep 1
  Feb 21 07:17:03 orin kernel: [  190.626408] rtl8192cu: Loading firmware 
rtlwifi/rtl8192cufw_TMSC.bin
  Feb 21 07:17:03 orin NetworkManager[1181]: <info>  [1487657823.7698] (wlan0): 
using nl80211 for WiFi device control
  Feb 21 07:17:03 orin kernel: [  190.636625] ieee80211 phy0: Selected rate 
control algorithm 'rtl_rc'
  Feb 21 07:17:03 orin kernel: [  190.637211] usbcore: registered new interface 
driver rtl8192cu
  Feb 21 07:17:03 orin systemd[1]: Starting Load/Save RF Kill Switch Status...
  Feb 21 07:17:03 orin NetworkManager[1181]: <info>  [1487657823.7780] device 
(wlan0): driver supports Access Point (AP) mode
  Feb 21 07:17:03 orin NetworkManager[1181]: <info>  [1487657823.7798] manager: 
(wlan0): new 802.11 WiFi device (/org/freedesktop/NetworkManager/Devices/4)
  Feb 21 07:17:03 orin kernel: [  190.648972] usbcore: registered new interface 
driver rtl8xxxu
  Feb 21 07:17:03 orin dbus[1112]: [system] Activating via systemd: service 
name='fi.w1.wpa_supplicant1' unit='wpa_supplicant.service'
  Feb 21 07:17:03 orin kernel: [  190.652729] rtl8192cu 8-2:1.0 
wlx14cc20104398: renamed from wlan0
  Feb 21 07:17:03 orin systemd[1]: Starting WPA supplicant...
  Feb 21 07:17:03 orin systemd[1]: Started Load/Save RF Kill Switch Status.
  Feb 21 07:17:03 orin NetworkManager[1181]: <info>  [1487657823.7963] rfkill1: 
found WiFi radio killswitch (at 
/sys/devices/pci0000:00/0000:00:10.1/usb8/8-2/8-2:1.0/ieee80211/phy0/rfkill1) 
(driver rtl8192cu)
  Feb 21 07:17:03 orin NetworkManager[1181]: <info>  [1487657823.8067] device 
(wlan0): interface index 5 renamed iface from 'wlan0' to 'wlx14cc20104398'
  Feb 21 07:17:03 orin NetworkManager[1181]: <info>  [1487657823.8165] devices 
added (path: 
/sys/devices/pci0000:00/0000:00:10.1/usb8/8-2/8-2:1.0/net/wlx14cc20104398, 
iface: wlx14cc20104398)
  Feb 21 07:17:03 orin NetworkManager[1181]: <info>  [1487657823.8166] device 
added (path: 
/sys/devices/pci0000:00/0000:00:10.1/usb8/8-2/8-2:1.0/net/wlx14cc20104398, 
iface: wlx14cc20104398): no ifupdown configuration found.
  Feb 21 07:17:03 orin NetworkManager[1181]: <info>  [1487657823.8174] device 
(wlx14cc20104398): state change: unmanaged -> unavailable (reason 'managed') 
[10 20 2]
  Feb 21 07:17:03 orin kernel: [  190.685491] IPv6: ADDRCONF(NETDEV_UP): 
wlx14cc20104398: link is not ready
  Feb 21 07:17:03 orin dbus[1112]: [system] Successfully activated service 
'fi.w1.wpa_supplicant1'
  Feb 21 07:17:03 orin wpa_supplicant[2491]: Successfully initialized 
wpa_supplicant
  Feb 21 07:17:03 orin systemd[1]: Started WPA supplicant.
  Feb 21 07:17:03 orin kernel: [  190.689851] rtl8192cu: MAC auto ON okay!
  Feb 21 07:17:04 orin kernel: [  190.890738] rtl8192cu: Tx queue select: 0x05
  Feb 21 07:17:06 orin kernel: [  193.095643] IPv6: ADDRCONF(NETDEV_UP): 
wlx14cc20104398: link is not ready
  Feb 21 07:17:06 orin NetworkManager[1181]: <info>  [1487657826.2323] 
supplicant: wpa_supplicant running
  Feb 21 07:17:06 orin NetworkManager[1181]: <info>  [1487657826.2328] device 
(wlx14cc20104398): supplicant interface state: init -> starting
  Feb 21 07:17:06 orin ModemManager[1180]: <info>  Couldn't find support for 
device at '/sys/devices/pci0000:00/0000:00:10.1/usb8/8-2': not supported by any 
plugin
  Feb 21 07:17:06 orin wpa_supplicant[2491]: dbus: 
wpa_dbus_get_object_properties: failed to get object properties: (none) none
  Feb 21 07:17:06 orin wpa_supplicant[2491]: dbus: Failed to construct signal
  Feb 21 07:17:06 orin NetworkManager[1181]: <info>  [1487657826.2973] device 
(wlx14cc20104398): supplicant interface state: starting -> ready
  Feb 21 07:17:06 orin NetworkManager[1181]: <info>  [1487657826.2975] device 
(wlx14cc20104398): state change: unavailable -> disconnected (reason 
'supplicant-available') [20 30 42]
  Feb 21 07:17:06 orin kernel: [  193.165895] IPv6: ADDRCONF(NETDEV_UP): 
wlx14cc20104398: link is not ready
  Feb 21 07:17:07 orin NetworkManager[1181]: <info>  [1487657827.2574] device 
(wlx14cc20104398): supplicant interface state: ready -> inactive
  Feb 21 07:17:07 orin NetworkManager[1181]: <info>  [1487657827.2696] policy: 
auto-activating connection 'wlankvm'
  Feb 21 07:17:07 orin NetworkManager[1181]: <info>  [1487657827.2711] device 
(wlx14cc20104398): Activation: starting connection 'wlankvm' 
(be9de38c-cfa5-4b6d-9672-655c0cfb7343)
  Feb 21 07:17:07 orin NetworkManager[1181]: <info>  [1487657827.2716] device 
(wlx14cc20104398): state change: disconnected -> prepare (reason 'none') [30 40 
0]
  Feb 21 07:17:07 orin NetworkManager[1181]: <info>  [1487657827.2719] manager: 
NetworkManager state is now CONNECTING
  Feb 21 07:17:07 orin NetworkManager[1181]: <info>  [1487657827.2729] device 
(wlx14cc20104398): state change: prepare -> config (reason 'none') [40 50 0]
  Feb 21 07:17:07 orin NetworkManager[1181]: <info>  [1487657827.2733] device 
(wlx14cc20104398): Activation: (wifi) access point 'wlankvm' has security, but 
secrets are required.
  Feb 21 07:17:07 orin NetworkManager[1181]: <info>  [1487657827.2733] device 
(wlx14cc20104398): state change: config -> need-auth (reason 'none') [50 60 0]
  Feb 21 07:17:07 orin NetworkManager[1181]: <info>  [1487657827.2787] device 
(wlx14cc20104398): state change: need-auth -> prepare (reason 'none') [60 40 0]
  Feb 21 07:17:07 orin NetworkManager[1181]: <info>  [1487657827.2797] device 
(wlx14cc20104398): state change: prepare -> config (reason 'none') [40 50 0]
  Feb 21 07:17:07 orin NetworkManager[1181]: <info>  [1487657827.2800] device 
(wlx14cc20104398): Activation: (wifi) connection 'wlankvm' has security, and 
secrets exist.  No new secrets needed.
  Feb 21 07:17:07 orin NetworkManager[1181]: <info>  [1487657827.2801] Config: 
added 'ssid' value 'wlankvm'
  Feb 21 07:17:07 orin NetworkManager[1181]: <info>  [1487657827.2801] Config: 
added 'scan_ssid' value '1'
  Feb 21 07:17:07 orin NetworkManager[1181]: <info>  [1487657827.2801] Config: 
added 'key_mgmt' value 'WPA-PSK'
  Feb 21 07:17:07 orin NetworkManager[1181]: <info>  [1487657827.2801] Config: 
added 'psk' value '<omitted>'
  Feb 21 07:17:07 orin NetworkManager[1181]: <info>  [1487657827.2819] 
sup-iface[0x2135cc0,wlx14cc20104398]: config: set interface ap_scan to 1
  Feb 21 07:17:07 orin wpa_supplicant[2491]: wlx14cc20104398: SME: Trying to 
authenticate with 00:1a:4f:45:23:23 (SSID='wlankvm' freq=2462 MHz)
  Feb 21 07:17:07 orin kernel: [  194.162920] wlx14cc20104398: authenticate 
with 00:1a:4f:45:23:23
  Feb 21 07:17:07 orin NetworkManager[1181]: <info>  [1487657827.3153] device 
(wlx14cc20104398): supplicant interface state: inactive -> authenticating
  Feb 21 07:17:07 orin kernel: [  194.182549] wlx14cc20104398: send auth to 
00:1a:4f:45:23:23 (try 1/3)
  Feb 21 07:17:07 orin kernel: [  194.189946] wlx14cc20104398: authenticated
  Feb 21 07:17:07 orin kernel: [  194.190420] wlx14cc20104398: associate with 
00:1a:4f:45:23:23 (try 1/3)
  Feb 21 07:17:07 orin wpa_supplicant[2491]: wlx14cc20104398: Trying to 
associate with 00:1a:4f:45:23:23 (SSID='wlankvm' freq=2462 MHz)
  Feb 21 07:17:07 orin NetworkManager[1181]: <info>  [1487657827.3284] device 
(wlx14cc20104398): supplicant interface state: authenticating -> associating
  Feb 21 07:17:07 orin kernel: [  194.221407] wlx14cc20104398: RX AssocResp 
from 00:1a:4f:45:23:23 (capab=0x411 status=0 aid=3)
  Feb 21 07:17:07 orin wpa_supplicant[2491]: wlx14cc20104398: Associated with 
00:1a:4f:45:23:23
  Feb 21 07:17:07 orin kernel: [  194.239524] wlx14cc20104398: associated
  Feb 21 07:17:07 orin kernel: [  194.239592] IPv6: ADDRCONF(NETDEV_CHANGE): 
wlx14cc20104398: link becomes ready
  Feb 21 07:17:07 orin NetworkManager[1181]: <info>  [1487657827.3778] device 
(wlx14cc20104398): supplicant interface state: associating -> 4-way handshake
  Feb 21 07:17:07 orin wpa_supplicant[2491]: wlx14cc20104398: WPA: Key 
negotiation completed with 00:1a:4f:45:23:23 [PTK=CCMP GTK=TKIP]
  Feb 21 07:17:07 orin wpa_supplicant[2491]: wlx14cc20104398: 
CTRL-EVENT-CONNECTED - Connection to 00:1a:4f:45:23:23 completed [id=0 id_str=]
  Feb 21 07:17:07 orin NetworkManager[1181]: <info>  [1487657827.4083] device 
(wlx14cc20104398): supplicant interface state: 4-way handshake -> completed
  Feb 21 07:17:07 orin NetworkManager[1181]: <info>  [1487657827.4084] device 
(wlx14cc20104398): Activation: (wifi) Stage 2 of 5 (Device Configure) 
successful.  Connected to wireless network 'wlankvm'.
  Feb 21 07:17:07 orin NetworkManager[1181]: <info>  [1487657827.4085] device 
(wlx14cc20104398): state change: config -> ip-config (reason 'none') [50 70 0]
  Feb 21 07:17:07 orin NetworkManager[1181]: <info>  [1487657827.4108] dhcp4 
(wlx14cc20104398): activation: beginning transaction (timeout in 45 seconds)
  Feb 21 07:17:07 orin NetworkManager[1181]: <info>  [1487657827.4337] dhcp4 
(wlx14cc20104398): dhclient started with pid 2533
  ^^^ freeze upon here 
-------------------------------------------------------------------

  
  WLAN stick (lsusb -v) 
------------------------------------------------------------------
  Bus 008 Device 002: ID 0bda:8178 Realtek Semiconductor Corp. RTL8192CU 
802.11n WLAN Adapter
  Device Descriptor:
    bLength                18
    bDescriptorType         1
    bcdUSB               2.00
    bDeviceClass            0 (Defined at Interface level)
    bDeviceSubClass         0 
    bDeviceProtocol         0 
    bMaxPacketSize0        64
    idVendor           0x0bda Realtek Semiconductor Corp.
    idProduct          0x8178 RTL8192CU 802.11n WLAN Adapter
    bcdDevice            2.00
    iManufacturer           1 Realtek
    iProduct                2 USB WLAN
    iSerial                 3 00e04c000001
    bNumConfigurations      1
    Configuration Descriptor:
      bLength                 9
      bDescriptorType         2
      wTotalLength           46
      bNumInterfaces          1
      bConfigurationValue     1
      iConfiguration          0 
      bmAttributes         0x80
        (Bus Powered)
      MaxPower              500mA
      Interface Descriptor:
        bLength                 9
        bDescriptorType         4
        bInterfaceNumber        0
        bAlternateSetting       0
        bNumEndpoints           4
        bInterfaceClass       255 Vendor Specific Class
        bInterfaceSubClass    255 Vendor Specific Subclass
        bInterfaceProtocol    255 Vendor Specific Protocol
        iInterface              0 
        Endpoint Descriptor:
          bLength                 7
          bDescriptorType         5
          bEndpointAddress     0x81  EP 1 IN
          bmAttributes            2
            Transfer Type            Bulk
            Synch Type               None
            Usage Type               Data
          wMaxPacketSize     0x0200  1x 512 bytes
          bInterval               0
        Endpoint Descriptor:
          bLength                 7
          bDescriptorType         5
          bEndpointAddress     0x02  EP 2 OUT
          bmAttributes            2
            Transfer Type            Bulk
            Synch Type               None
            Usage Type               Data
          wMaxPacketSize     0x0200  1x 512 bytes
          bInterval               0
        Endpoint Descriptor:
          bLength                 7
          bDescriptorType         5
          bEndpointAddress     0x03  EP 3 OUT
          bmAttributes            2
            Transfer Type            Bulk
            Synch Type               None
            Usage Type               Data
          wMaxPacketSize     0x0200  1x 512 bytes
          bInterval               0
        Endpoint Descriptor:
          bLength                 7
          bDescriptorType         5
          bEndpointAddress     0x84  EP 4 IN
          bmAttributes            3
            Transfer Type            Interrupt
            Synch Type               None
            Usage Type               Data
          wMaxPacketSize     0x0040  1x 64 bytes
          bInterval               1
  Device Qualifier (for other device speed):
    bLength                10
    bDescriptorType         6
    bcdUSB               2.00
    bDeviceClass            0 (Defined at Interface level)
    bDeviceSubClass         0 
    bDeviceProtocol         0 
    bMaxPacketSize0        64
    bNumConfigurations      1
  Device Status:     0x0000
    (Bus Powered)
  
--------------------------------------------------------------------------------

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-59-generic 4.4.0-59.80
  ProcVersionSignature: Ubuntu 4.4.0-59.80-generic 4.4.35
  Uname: Linux 4.4.0-59-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  camikusch   2212 F.... pulseaudio
   /dev/snd/controlC1:  camikusch   2212 F.... pulseaudio
  CurrentDesktop: XFCE
  Date: Tue Feb 21 07:42:51 2017
  HibernationDevice: RESUME=UUID=8259bcba-b0e0-455e-87c3-1554b4a2f9c1
  InstallationDate: Installed on 2016-04-19 (307 days ago)
  InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-59-generic 
root=/dev/mapper/xubuntu--vg-root ro quiet
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-59-generic N/A
   linux-backports-modules-4.4.0-59-generic  N/A
   linux-firmware                            1.157.8
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-04-22 (305 days ago)
  dmi.bios.date: 01/14/2016
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P3.40
  dmi.board.name: FM2A88X-ITX+
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP3.40:bd01/14/2016:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnFM2A88X-ITX+:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.

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