Here is an annotated dump from kern.log of what's going on when I suffer and then fix this issue. Given the traffic of the log, it seems highly likely that the log lines annotate as being associated with wireless trouble is tightly connected.
# Last line from previous association Apr 15 17:04:22 sputnik kernel: [ 16.183171] wlan0: Limiting TX power to 27 (27 - 0) dBm as advertised by 00:18:0a:30:10:1c # Everything goes sideways after this spurt Apr 15 17:35:22 sputnik kernel: [ 1872.623038] cfg80211: Calling CRDA to update world regulatory domain Apr 15 17:35:22 sputnik kernel: [ 1872.632242] cfg80211: World regulatory domain updated: Apr 15 17:35:22 sputnik kernel: [ 1872.632251] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp) Apr 15 17:35:22 sputnik kernel: [ 1872.632256] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) Apr 15 17:35:22 sputnik kernel: [ 1872.632261] cfg80211: (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm) Apr 15 17:35:22 sputnik kernel: [ 1872.632264] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm) Apr 15 17:35:22 sputnik kernel: [ 1872.632268] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) Apr 15 17:35:22 sputnik kernel: [ 1872.632272] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) Apr 15 17:35:22 sputnik kernel: [ 1873.085904] wlan0: authenticate with 02:18:1a:30:10:1c Apr 15 17:35:22 sputnik kernel: [ 1873.090772] wlan0: send auth to 02:18:1a:30:10:1c (try 1/3) Apr 15 17:35:22 sputnik kernel: [ 1873.292670] wlan0: send auth to 02:18:1a:30:10:1c (try 2/3) Apr 15 17:35:23 sputnik kernel: [ 1873.300550] wlan0: authenticated Apr 15 17:35:23 sputnik kernel: [ 1873.304635] wlan0: associate with 02:18:1a:30:10:1c (try 1/3) Apr 15 17:35:23 sputnik kernel: [ 1873.332528] wlan0: RX AssocResp from 02:18:1a:30:10:1c (capab=0x411 status=0 aid=3) Apr 15 17:35:23 sputnik kernel: [ 1873.335828] wlan0: associated Apr 15 17:35:23 sputnik kernel: [ 1873.336220] cfg80211: Calling CRDA for country: US Apr 15 17:35:23 sputnik kernel: [ 1873.347205] cfg80211: Regulatory domain changed to country: US Apr 15 17:35:23 sputnik kernel: [ 1873.347215] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp) Apr 15 17:35:23 sputnik kernel: [ 1873.347223] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2700 mBm) Apr 15 17:35:23 sputnik kernel: [ 1873.347231] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 1700 mBm) Apr 15 17:35:23 sputnik kernel: [ 1873.347237] cfg80211: (5250000 KHz - 5330000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) Apr 15 17:35:23 sputnik kernel: [ 1873.347244] cfg80211: (5490000 KHz - 5600000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) Apr 15 17:35:23 sputnik kernel: [ 1873.347251] cfg80211: (5650000 KHz - 5710000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) Apr 15 17:35:23 sputnik kernel: [ 1873.347257] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 3000 mBm) Apr 15 17:35:23 sputnik kernel: [ 1873.386907] wlan0: Limiting TX power to 27 (30 - 3) dBm as advertised by 02:18:1a:30:10:1c # RFKill-cycle restores service temporarily Apr 15 17:37:42 sputnik kernel: [ 2013.009060] iwlwifi 0000:01:00.0: RF_KILL bit toggled to disable radio. Apr 15 17:37:42 sputnik kernel: [ 2013.009255] wlan0: deauthenticating from 02:18:1a:30:10:1c by local choice (reason=3) Apr 15 17:37:42 sputnik kernel: [ 2013.009620] iwlwifi 0000:01:00.0: Not sending command - RF KILL Apr 15 17:37:42 sputnik kernel: [ 2013.009625] iwlwifi 0000:01:00.0: Not sending command - RF KILL Apr 15 17:37:42 sputnik kernel: [ 2013.009627] wlan0: HW problem - can not stop rx aggregation for tid 0 Apr 15 17:37:42 sputnik kernel: [ 2013.009650] iwlwifi 0000:01:00.0: Not sending command - RF KILL Apr 15 17:37:42 sputnik kernel: [ 2013.009652] wlan0: failed to remove key (0, 02:18:1a:30:10:1c) from hardware (-5) Apr 15 17:37:42 sputnik kernel: [ 2013.016803] iwlwifi 0000:01:00.0: Not sending command - RF KILL Apr 15 17:37:42 sputnik kernel: [ 2013.016829] iwlwifi 0000:01:00.0: Not sending command - RF KILL Apr 15 17:37:42 sputnik kernel: [ 2013.016851] iwlwifi 0000:01:00.0: Not sending command - RF KILL Apr 15 17:37:42 sputnik kernel: [ 2013.016870] iwlwifi 0000:01:00.0: Not sending command - RF KILL Apr 15 17:37:42 sputnik kernel: [ 2013.016882] iwlwifi 0000:01:00.0: Not sending command - RF KILL Apr 15 17:37:42 sputnik kernel: [ 2013.016960] iwlwifi 0000:01:00.0: Not sending command - RF KILL Apr 15 17:37:42 sputnik kernel: [ 2013.016970] wlan0: failed to remove key (2, ff:ff:ff:ff:ff:ff) from hardware (-5) Apr 15 17:37:42 sputnik kernel: [ 2013.017340] cfg80211: Calling CRDA to update world regulatory domain Apr 15 17:37:42 sputnik kernel: [ 2013.024747] iwlwifi 0000:01:00.0: Not sending command - RF KILL Apr 15 17:37:42 sputnik kernel: [ 2013.024787] iwlwifi 0000:01:00.0: Not sending command - RF KILL Apr 15 17:37:42 sputnik kernel: [ 2013.028581] cfg80211: World regulatory domain updated: Apr 15 17:37:42 sputnik kernel: [ 2013.028584] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp) Apr 15 17:37:42 sputnik kernel: [ 2013.028587] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) Apr 15 17:37:42 sputnik kernel: [ 2013.028591] cfg80211: (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm) Apr 15 17:37:42 sputnik kernel: [ 2013.028592] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm) Apr 15 17:37:42 sputnik kernel: [ 2013.028594] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) Apr 15 17:37:42 sputnik kernel: [ 2013.028595] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) Apr 15 17:37:42 sputnik kernel: [ 2013.034172] usb 2-1.5: USB disconnect, device number 3 Apr 15 17:37:43 sputnik kernel: [ 2013.210276] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready Apr 15 17:37:46 sputnik kernel: [ 2016.472461] iwlwifi 0000:01:00.0: RF_KILL bit toggled to enable radio. Apr 15 17:37:46 sputnik kernel: [ 2016.473946] iwlwifi 0000:01:00.0: L1 Enabled; Disabling L0S Apr 15 17:37:46 sputnik kernel: [ 2016.480950] iwlwifi 0000:01:00.0: Radio type=0x2-0x1-0x0 Apr 15 17:37:46 sputnik kernel: [ 2016.707250] usb 2-1.5: new full-speed USB device number 4 using ehci-pci Apr 15 17:37:46 sputnik kernel: [ 2016.720031] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready Apr 15 17:37:46 sputnik kernel: [ 2016.903794] usb 2-1.5: New USB device found, idVendor=8087, idProduct=07da Apr 15 17:37:46 sputnik kernel: [ 2016.903799] usb 2-1.5: New USB device strings: Mfr=0, Product=0, SerialNumber=0 Apr 15 17:37:53 sputnik kernel: [ 2023.089951] wlan0: authenticate with 00:18:0a:30:10:1c Apr 15 17:37:53 sputnik kernel: [ 2023.102535] wlan0: send auth to 00:18:0a:30:10:1c (try 1/3) Apr 15 17:37:53 sputnik kernel: [ 2023.111619] wlan0: authenticated Apr 15 17:37:53 sputnik kernel: [ 2023.113539] wlan0: associate with 00:18:0a:30:10:1c (try 1/3) Apr 15 17:37:53 sputnik kernel: [ 2023.147173] wlan0: RX AssocResp from 00:18:0a:30:10:1c (capab=0x431 status=0 aid=2) Apr 15 17:37:53 sputnik kernel: [ 2023.154851] wlan0: associated Apr 15 17:37:53 sputnik kernel: [ 2023.154880] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready Apr 15 17:37:53 sputnik kernel: [ 2023.154958] cfg80211: Calling CRDA for country: US Apr 15 17:37:53 sputnik kernel: [ 2023.159505] cfg80211: Regulatory domain changed to country: US Apr 15 17:37:53 sputnik kernel: [ 2023.159514] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp) Apr 15 17:37:53 sputnik kernel: [ 2023.159516] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2700 mBm) Apr 15 17:37:53 sputnik kernel: [ 2023.159518] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 1700 mBm) Apr 15 17:37:53 sputnik kernel: [ 2023.159519] cfg80211: (5250000 KHz - 5330000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) Apr 15 17:37:53 sputnik kernel: [ 2023.159520] cfg80211: (5490000 KHz - 5600000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) Apr 15 17:37:53 sputnik kernel: [ 2023.159521] cfg80211: (5650000 KHz - 5710000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) Apr 15 17:37:53 sputnik kernel: [ 2023.159522] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 3000 mBm) Apr 15 17:37:53 sputnik kernel: [ 2023.183750] wlan0: Limiting TX power to 27 (27 - 0) dBm as advertised by 00:18:0a:30:10:1c -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1091372 Title: wifi slows and/or drops frequently To manage notifications about this bug go to: https://bugs.launchpad.net/dell-sputnik/+bug/1091372/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
