I think the bug is still in the new ubuntu kernel.

$ uname -a
Linux heikki-HP-ProBook-455-G1 3.11.0-13-generic #20-Ubuntu SMP Wed Oct 23 
07:38:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

[  140.490634] wlan0: authenticate with 00:22:07:2c:c5:75
[  140.505826] wlan0: send auth to 00:22:07:2c:c5:75 (try 1/3)
[  140.508116] wlan0: authenticated
[  140.508360] rt2800pci 0000:03:00.0 wlan0: disabling HT/VHT due to WEP/TKIP 
use
[  140.509699] wlan0: associate with 00:22:07:2c:c5:75 (try 1/3)
[  140.514259] wlan0: RX AssocResp from 00:22:07:2c:c5:75 (capab=0x411 status=0 
aid=3)
[  140.514698] wlan0: associated
[  140.514751] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 1065.781577] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1065.941435] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1066.300990] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1066.460967] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1066.469009] cfg80211: Calling CRDA to update world regulatory domain
[ 1066.476383] cfg80211: World regulatory domain updated:
[ 1066.476393] cfg80211:   (start_freq - end_freq @ bandwidth), 
(max_antenna_gain, max_eirp)
[ 1066.476398] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 
2000 mBm)
[ 1066.476404] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 
2000 mBm)
[ 1066.476409] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 
2000 mBm)
[ 1066.476413] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 
2000 mBm)
[ 1066.476417] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 
2000 mBm)
[ 1066.720746] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1066.880600] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1067.040462] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1067.200318] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1068.252165] wlan0: authenticate with 00:22:07:2c:c5:75
[ 1068.419227] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1068.579007] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1068.579196] wlan0: send auth to 00:22:07:2c:c5:75 (try 1/3)
[ 1069.630152] wlan0: send auth to 00:22:07:2c:c5:75 (try 2/3)
[ 1070.617272] wlan0: send auth to 00:22:07:2c:c5:75 (try 3/3)
[ 1071.616379] wlan0: authentication with 00:22:07:2c:c5:75 timed out
[ 1071.784229] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1071.944086] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1072.203858] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1072.363715] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1072.523445] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1072.683430] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1073.902341] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1074.062197] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1078.893896] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1079.053751] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1079.213579] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1079.373449] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1080.592378] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1080.752222] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1082.076673] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 1082.270882] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1082.430742] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1082.590612] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1082.750448] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1083.969367] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1084.129226] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1085.955602] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1086.115456] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1086.275286] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1086.435169] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1087.654068] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1087.813839] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1108.935118] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1109.094975] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1109.254836] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1109.414518] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1110.633573] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1110.793354] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1141.909717] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1142.069589] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1142.229447] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1142.389304] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1143.608097] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1143.768086] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1170.457888] r8169 0000:01:00.0 eth0: link up
[ 1170.457904] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 1184.869164] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1185.029098] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1185.188946] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1185.349016] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1186.568453] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1186.728469] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1237.852362] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1238.012334] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1238.172304] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1238.332171] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1239.551694] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1239.711640] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1300.823724] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1300.983692] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1301.143616] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1301.303603] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1301.339542] ieee80211 phy0: rt2x00queue_write_tx_frame: Error - Dropping 
frame due to full tx queue 0
[ 1302.523119] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1302.682986] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1363.803123] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1363.963220] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1364.123039] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1364.283011] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1364.319092] ieee80211 phy0: rt2x00queue_write_tx_frame: Error - Dropping 
frame due to full tx queue 0
[ 1365.502470] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1365.662488] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1426.753362] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1426.913212] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1427.073082] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1427.232944] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1427.268932] ieee80211 phy0: rt2x00queue_write_tx_frame: Error - Dropping 
frame due to full tx queue 0
[ 1428.451911] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1428.611757] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1489.701275] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1489.861157] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1490.021061] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1490.180982] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1490.216938] ieee80211 phy0: rt2x00queue_write_tx_frame: Error - Dropping 
frame due to full tx queue 0
[ 1491.399744] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1491.559651] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1552.641306] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1552.801168] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1552.961023] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1553.120871] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1553.156886] ieee80211 phy0: rt2x00queue_write_tx_frame: Error - Dropping 
frame due to full tx queue 0
[ 1554.339783] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1554.499557] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1615.589204] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1615.749061] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1615.908914] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1616.068778] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush
[ 1616.104726] ieee80211 phy0: rt2x00queue_write_tx_frame: Error - Dropping 
frame due to full tx queue 0
[ 1617.287690] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 0 
failed to flush
[ 1617.447545] ieee80211 phy0: rt2x00queue_flush_queue: Warning - Queue 2 
failed to flush

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https://bugs.launchpad.net/bugs/1239459

Title:
  [RT3290] wifi doesn't connect or disconnects after few seconds

Status in The Linux Kernel:
  Unknown
Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  With the new 3.11.0-12-generic kernel, wifi has problems to connect with many 
errors like these:
  Oct 13 23:50:03 ubuntotto kernel: [ 1186.580726] ieee80211 phy0: 
rt2x00queue_flush_queue: Warning - Queue 0 failed to flush
  Oct 13 23:50:03 ubuntotto kernel: [ 1186.740659] ieee80211 phy0: 
rt2x00queue_flush_queue: Warning - Queue 2 failed to flush
  Oct 13 23:50:04 ubuntotto kernel: [ 1186.900544] ieee80211 phy0: 
rt2x00queue_flush_queue: Warning - Queue 0 failed to flush
  Oct 13 23:50:04 ubuntotto kernel: [ 1187.060571] ieee80211 phy0: 
rt2x00queue_flush_queue: Warning - Queue 2 failed to flush
  Oct 13 23:50:04 ubuntotto kernel: [ 1187.096576] ieee80211 phy0: 
rt2x00queue_write_tx_frame: Error - Dropping frame due to full tx queue 0
  Oct 13 23:50:05 ubuntotto kernel: [ 1188.280106] ieee80211 phy0: 
rt2x00queue_flush_queue: Warning - Queue 0 failed to flush
  Oct 13 23:50:05 ubuntotto kernel: [ 1188.440128] ieee80211 phy0: 
rt2x00queue_flush_queue: Warning - Queue 2 failed to flush
  Oct 13 23:51:06 ubuntotto kernel: [ 1249.560697] ieee80211 phy0: 
rt2x00queue_flush_queue: Warning - Queue 0 failed to flush
  Oct 13 23:51:06 ubuntotto kernel: [ 1249.720644] ieee80211 phy0: 
rt2x00queue_flush_queue: Warning - Queue 2 failed to flush
  Oct 13 23:51:07 ubuntotto kernel: [ 1249.880590] ieee80211 phy0: 
rt2x00queue_flush_queue: Warning - Queue 0 failed to flush
  Oct 13 23:51:07 ubuntotto kernel: [ 1250.040543] ieee80211 phy0: 
rt2x00queue_flush_queue: Warning - Queue 2 failed to flush

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-12-generic 3.11.0-12.19
  ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
  Uname: Linux 3.11.0-12-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  andrea     1791 F.... pulseaudio
  Date: Sun Oct 13 23:45:04 2013
  HibernationDevice: RESUME=UUID=297ef090-5420-41f6-8439-f1254f3e9e15
  InstallationDate: Installed on 2013-10-12 (1 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: ASUSTeK COMPUTER INC. X200CA
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-12-generic 
root=UUID=088f2a7d-b78f-4bdd-a184-754b70a3184a ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-12-generic N/A
   linux-backports-modules-3.11.0-12-generic  N/A
   linux-firmware                             1.116
  SourcePackage: linux
  UpgradeStatus: Upgraded to saucy on 2013-10-13 (0 days ago)
  dmi.bios.date: 09/18/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: X200CA.208
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: X200CA
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrX200CA.208:bd09/18/2013:svnASUSTeKCOMPUTERINC.:pnX200CA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX200CA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: X200CA
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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