自Trusty以来的网络问题
自从升级（全新安装）到Trusty（Kubuntu – EDIT和现在的Ubuntu vanilla，我转回去进一步排除故障 ）后，我注意到了网络问题。
我的网络正好每隔两分钟就会出现一段时间，然后很快就会重新上线。 这清楚地反映在syslog中：
Apr 24 07:52:45 jordan-TECRA-R840 wpa_supplicant[1271]: wlan0: CTRL-EVENT-SCAN-STARTED Apr 24 07:52:51 jordan-TECRA-R840 wpa_supplicant[1271]: nl80211: send_and_recv->nl_recvmsgs failed: -33 Apr 24 07:54:45 jordan-TECRA-R840 wpa_supplicant[1271]: wlan0: CTRL-EVENT-SCAN-STARTED Apr 24 07:54:50 jordan-TECRA-R840 wpa_supplicant[1271]: nl80211: send_and_recv->nl_recvmsgs failed: -33 Apr 24 07:56:45 jordan-TECRA-R840 wpa_supplicant[1271]: wlan0: CTRL-EVENT-SCAN-STARTED Apr 24 07:56:50 jordan-TECRA-R840 wpa_supplicant[1271]: nl80211: send_and_recv->nl_recvmsgs failed: -33 Apr 24 07:58:45 jordan-TECRA-R840 wpa_supplicant[1271]: wlan0: CTRL-EVENT-SCAN-STARTED Apr 24 07:58:50 jordan-TECRA-R840 wpa_supplicant[1271]: nl80211: send_and_recv->nl_recvmsgs failed: -33 Apr 24 08:00:45 jordan-TECRA-R840 wpa_supplicant[1271]: wlan0: CTRL-EVENT-SCAN-STARTED Apr 24 08:00:50 jordan-TECRA-R840 wpa_supplicant[1271]: nl80211: send_and_recv->nl_recvmsgs failed: -33 Apr 24 08:02:45 jordan-TECRA-R840 wpa_supplicant[1271]: wlan0: CTRL-EVENT-SCAN-STARTED Apr 24 08:04:45 jordan-TECRA-R840 wpa_supplicant[1271]: wlan0: CTRL-EVENT-SCAN-STARTED Apr 24 08:04:51 jordan-TECRA-R840 wpa_supplicant[1271]: nl80211: send_and_recv->nl_recvmsgs failed: -33 Apr 24 08:06:45 jordan-TECRA-R840 wpa_supplicant[1271]: wlan0: CTRL-EVENT-SCAN-STARTED Apr 24 08:06:50 jordan-TECRA-R840 wpa_supplicant[1271]: nl80211: send_and_recv->nl_recvmsgs failed: -33 Apr 24 08:08:45 jordan-TECRA-R840 wpa_supplicant[1271]: wlan0: CTRL-EVENT-SCAN-STARTED Apr 24 08:08:50 jordan-TECRA-R840 wpa_supplicant[1271]: nl80211: send_and_recv->nl_recvmsgs failed: -33 Apr 24 08:10:45 jordan-TECRA-R840 wpa_supplicant[1271]: wlan0: CTRL-EVENT-SCAN-STARTED Apr 24 08:10:50 jordan-TECRA-R840 wpa_supplicant[1271]: nl80211: send_and_recv->nl_recvmsgs failed: -33 Apr 24 08:12:45 jordan-TECRA-R840 wpa_supplicant[1271]: wlan0: CTRL-EVENT-SCAN-STARTED Apr 24 08:12:50 jordan-TECRA-R840 wpa_supplicant[1271]: nl80211: send_and_recv->nl_recvmsgs failed: -33 Apr 24 08:14:45 jordan-TECRA-R840 wpa_supplicant[1271]: wlan0: CTRL-EVENT-SCAN-STARTED Apr 24 08:14:50 jordan-TECRA-R840 wpa_supplicant[1271]: nl80211: send_and_recv->nl_recvmsgs failed: -33 Apr 24 08:16:45 jordan-TECRA-R840 wpa_supplicant[1271]: wlan0: CTRL-EVENT-SCAN-STARTED Apr 24 08:16:50 jordan-TECRA-R840 wpa_supplicant[1271]: nl80211: send_and_recv->nl_recvmsgs failed: -33 Apr 24 08:18:45 jordan-TECRA-R840 wpa_supplicant[1271]: wlan0: CTRL-EVENT-SCAN-STARTED Apr 24 08:18:50 jordan-TECRA-R840 wpa_supplicant[1271]: nl80211: send_and_recv->nl_recvmsgs failed: -33 Apr 24 08:20:45 jordan-TECRA-R840 wpa_supplicant[1271]: wlan0: CTRL-EVENT-SCAN-STARTED Apr 24 08:20:50 jordan-TECRA-R840 wpa_supplicant[1271]: nl80211: send_and_recv->nl_recvmsgs failed: -33 我还没有花太多时间进行故障排除，我刚刚安装了一天。 我想知道以前是否有人见过这个问题？ 我不记得在我使用完全相同的硬件3天前在Ubuntu 13.10上时看到了这一点。
硬件：Tecra R840-S8430网络控制器：英特尔公司Centrino Advanced-N 6230 [彩虹峰]（转34级）味道：Kubuntu + Ubuntu发布：14.04 LTS
更新 – 更多信息（5/05/05）
是的，这似乎放弃了我的联系。 这是一个典型的drop的一些syslog，我必须禁用/重新启用wifi才能恢复它：
May 5 09:29:57 Oban kernel: [74616.819616] wlan0: deauthenticated from 00:26:62:4f:c3:f6 (Reason: 6) May 5 09:29:57 Oban wpa_supplicant[1368]: wlan0: CTRL-EVENT-DISCONNECTED bssid=00:26:62:4f:c3:f6 reason=6 May 5 09:29:57 Oban NetworkManager[1151]: Connection disconnected (reason 6) May 5 09:29:57 Oban kernel: [74616.851674] cfg80211: Calling CRDA to update world regulatory domain May 5 09:29:57 Oban wpa_supplicant[1368]: wlan0: SME: Trying to authenticate with 00:26:62:4f:c3:f6 (SSID='Air' freq=2462 MHz) May 5 09:29:57 Oban NetworkManager[1151]: (wlan0): supplicant interface state: completed -> disconnected May 5 09:29:57 Oban wpa_supplicant[1368]: wlan0: CTRL-EVENT-SCAN-STARTED May 5 09:29:57 Oban NetworkManager[1151]: (wlan0): supplicant interface state: disconnected -> authenticating May 5 09:29:57 Oban kernel: [74616.921570] wlan0: authenticate with 00:26:62:4f:c3:f6 May 5 09:29:57 Oban kernel: [74616.925036] wlan0: send auth to 00:26:62:4f:c3:f6 (try 1/3) May 5 09:29:57 Oban kernel: [74616.931650] cfg80211: World regulatory domain updated: May 5 09:29:57 Oban kernel: [74616.931654] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp) May 5 09:29:57 Oban kernel: [74616.931656] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) May 5 09:29:57 Oban kernel: [74616.931658] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) May 5 09:29:57 Oban kernel: [74616.931659] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm) May 5 09:29:57 Oban kernel: [74616.931661] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) May 5 09:29:57 Oban kernel: [74616.931662] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) May 5 09:29:57 Oban kernel: [74617.031487] wlan0: send auth to 00:26:62:4f:c3:f6 (try 2/3) May 5 09:29:57 Oban kernel: [74617.035474] wlan0: authenticated May 5 09:29:57 Oban wpa_supplicant[1368]: wlan0: Trying to associate with 00:26:62:4f:c3:f6 (SSID='Air' freq=2462 MHz) May 5 09:29:57 Oban NetworkManager[1151]: (wlan0): supplicant interface state: authenticating -> associating May 5 09:29:57 Oban kernel: [74617.039506] wlan0: associate with 00:26:62:4f:c3:f6 (try 1/3) May 5 09:29:57 Oban kernel: [74617.043029] wlan0: RX AssocResp from 00:26:62:4f:c3:f6 (capab=0x431 status=0 aid=4) May 5 09:29:57 Oban wpa_supplicant[1368]: wlan0: Associated with 00:26:62:4f:c3:f6 May 5 09:29:57 Oban kernel: [74617.050233] wlan0: associated May 5 09:29:57 Oban kernel: [74617.050393] cfg80211: Calling CRDA for country: US May 5 09:29:57 Oban NetworkManager[1151]: (wlan0): supplicant interface state: associating -> associated May 5 09:29:57 Oban kernel: [74617.056664] cfg80211: Regulatory domain changed to country: US May 5 09:29:57 Oban kernel: [74617.056673] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp) May 5 09:29:57 Oban kernel: [74617.056679] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2700 mBm) May 5 09:29:57 Oban kernel: [74617.056685] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 1700 mBm) May 5 09:29:57 Oban kernel: [74617.056690] cfg80211: (5250000 KHz - 5330000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) May 5 09:29:57 Oban kernel: [74617.056695] cfg80211: (5490000 KHz - 5600000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) May 5 09:29:57 Oban kernel: [74617.056700] cfg80211: (5650000 KHz - 5710000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) May 5 09:29:57 Oban kernel: [74617.056705] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 3000 mBm) May 5 09:29:57 Oban kernel: [74617.056711] cfg80211: (57240000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 4000 mBm) May 5 09:29:57 Oban NetworkManager[1151]: (wlan0): supplicant interface state: associated -> 4-way handshake May 5 09:29:57 Oban wpa_supplicant[1368]: wlan0: WPA: Key negotiation completed with 00:26:62:4f:c3:f6 [PTK=CCMP GTK=CCMP] May 5 09:29:57 Oban wpa_supplicant[1368]: wlan0: CTRL-EVENT-CONNECTED - Connection to 00:26:62:4f:c3:f6 completed [id=0 id_str=] May 5 09:29:57 Oban NetworkManager[1151]: (wlan0): supplicant interface state: 4-way handshake -> completed May 5 09:31:34 Oban kernel: [74713.775114] wlan0: deauthenticated from 00:26:62:4f:c3:f6 (Reason: 6) May 5 09:31:34 Oban wpa_supplicant[1368]: wlan0: CTRL-EVENT-DISCONNECTED bssid=00:26:62:4f:c3:f6 reason=6 May 5 09:31:34 Oban NetworkManager[1151]: Connection disconnected (reason 6) May 5 09:31:34 Oban kernel: [74713.812782] cfg80211: Calling CRDA to update world regulatory domain May 5 09:31:34 Oban NetworkManager[1151]: (wlan0): supplicant interface state: completed -> disconnected May 5 09:31:34 Oban kernel: [74713.816717] cfg80211: World regulatory domain updated: May 5 09:31:34 Oban kernel: [74713.816724] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp) May 5 09:31:34 Oban kernel: [74713.816729] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) May 5 09:31:34 Oban kernel: [74713.816732] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) May 5 09:31:34 Oban kernel: [74713.816735] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm) May 5 09:31:34 Oban kernel: [74713.816738] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) May 5 09:31:34 Oban kernel: [74713.816741] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) May 5 09:31:34 Oban NetworkManager[1151]: (wlan0): supplicant interface state: disconnected -> scanning May 5 09:31:49 Oban NetworkManager[1151]: (wlan0): link timed out. May 5 09:31:49 Oban NetworkManager[1151]: (wlan0): device state change: activated -> failed (reason 'SSID not found') [100 120 53] May 5 09:31:49 Oban NetworkManager[1151]: NetworkManager state is now DISCONNECTED May 5 09:31:49 Oban NetworkManager[1151]: Activation (wlan0) failed for connection 'Air' May 5 09:31:49 Oban dbus[943]: [system] Activating service name='org.freedesktop.nm_dispatcher' (using servicehelper) May 5 09:31:49 Oban NetworkManager[1151]: (wlan0): device state change: failed -> disconnected (reason 'none') [120 30 0] May 5 09:31:49 Oban NetworkManager[1151]: (wlan0): deactivating device (reason 'none') [0] May 5 09:11:56 Oban whoopsie[1374]: online May 5 09:31:49 Oban whoopsie[1374]: offline May 5 09:31:49 Oban kernel: [74729.721867] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready May 5 09:31:49 Oban NetworkManager[1151]: (wlan0): canceled DHCP transaction, DHCP client pid 11587 May 5 09:31:49 Oban avahi-daemon[1099]: Withdrawing address record for fe80::8a53:2eff:fe07:49c8 on wlan0. May 5 09:31:49 Oban avahi-daemon[1099]: Leaving mDNS multicast group on interface wlan0.IPv6 with address fe80::8a53:2eff:fe07:49c8. May 5 09:31:49 Oban avahi-daemon[1099]: Interface wlan0.IPv6 no longer relevant for mDNS. May 5 09:31:49 Oban NetworkManager[1151]: DNS: plugin dnsmasq update failed May 5 09:31:49 Oban NetworkManager[1151]: Removing DNS information from /sbin/resolvconf May 5 09:31:49 Oban avahi-daemon[1099]: Withdrawing address record for 192.168.1.5 on wlan0. May 5 09:31:49 Oban avahi-daemon[1099]: Leaving mDNS multicast group on interface wlan0.IPv4 with address 192.168.1.5. May 5 09:31:49 Oban avahi-daemon[1099]: Interface wlan0.IPv4 no longer relevant for mDNS. May 5 09:31:49 Oban dnsmasq[1888]: setting upstream servers from DBus May 5 09:31:50 Oban NetworkManager[1151]: Couldn't disconnect supplicant interface: This interface is not connected. May 5 09:31:50 Oban dbus[943]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
这太令人沮丧了。 我不能总是在cat5上。 正如我之前所说，这种情况从未发生在13.10。 我真的不想降级。 有没有办法可以使用13.10的wifi驱动程序？
此外，我将我的wifi安全性从WPA2更改为128 WEP，到目前为止，我只在几个小时内断开连接一次。 在WPA2上，它平均每10个。
根据启动板上的评论 ，这是无害的：
WinEunuchs2Unix（ricklee518）在2014-08-18写道：＃24
自从2009年以来，这种情况一直在发生，开发人员确实回应说它只是在有多个连接点的企业环境中进行漫游。 如果您在家中只有一个AP进入网络管理器，请选择“编辑连接”，突出显示您的AP / wlan0并单击“编辑”。 然后单击BSSID旁边的向下箭头，该箭头为空白。 然后选择之前隐藏的mac地址。
我很抱歉将其与802.11n问题联系起来。 一旦被咬了两次害羞我猜….
我已经完成了这些步骤，扫描和错误行都已停止记录。 我还不能说它是否使我的连接更稳定，但我会记得在一两天内更新这个答案。
3周后我回来了（丢失了打开的标签，哎呀），我觉得它有所帮助。 我仍然得到了奇怪的连接丢失，但它们似乎并不像我记得他们在我第一次发现这个问题时回来时那么常见。
我可能有同样的问题，请参阅“ 在Centrino Advanced-N 6230 [彩虹峰]中经常从Wifi取消认证（原因：6） ”。
我想通过禁用mode-N wifi找到了解决方法。 这可以通过“modprobe iwlwifi 11n_disable = 1”暂时（在删除模块后）或通过将“options iwlwifi 11n_disable = 1”添加到/etc/modprobe.d中的某个文件来永久完成。
也许我们应该在bugzilla.kernel.org上打开一个bug？
@Jordan，我找到了一个解决方法，即停止网络管理器，以避免每2秒扫描一次AP，这是我认为wpa_supplicant驱动程序代码中可能存在错误的地方。 一旦我连接到我的AP，我运行以下…
sudo killall -STOP NetworkManager
虽然我在桌面上使用无线网络，但它是静止的，我真的不需要NetworkManager不断寻找AP并解决这个问题。 在驱动程序中修复此问题之前，我将继续进行上述工作。
它可能是Linux驱动程序或接入点固件中的错误，或两者兼而有之。 关闭省电有帮助吗？ iwconfig wlan0断电
要缩小问题范围，您可以尝试使用其他接入点和USB wifi适配器。 不幸的是，这类问题很难诊断出来。