可能是重复的这。
有时，当我将笔记本电脑从挂起/休眠状态唤醒后，或在热点之间重新连接/更改时，我的 WiFi 会停止工作。我通常使用网络管理器来管理我的连接，有时当我的 wifi 停止连接时，禁用网络管理器并更改为 netctl 会有所帮助。通常，重新启动是最快的解决方案。
设备和驱动程序
Lenovo Thinkpad x230
03:00.0 Network controller: Intel Corporation Centrino Advanced-N 6205 [Taylor Peak] (rev 34)
Subsystem: Intel Corporation Centrino Advanced-N 6205 AGN
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi
iwlwifi 0000:03:00.0: loaded firmware version 18.168.6.1 op_mode iwldvm
日志
（使用网络管理器和netctl进行测试）
https://bpaste.net/show/dfcb23dea3de
NETCTL
======
-- Unit netctl@wlp3s0\x2dJoutonetti.service has begun starting up.
helmi 27 00:03:24 kampela network[3712]: Starting network profile 'wlp3s0-Joutonetti'...
helmi 27 00:03:24 kampela kernel: iwlwifi 0000:03:00.0: L1 Enabled - LTR Disabled
helmi 27 00:03:24 kampela kernel: iwlwifi 0000:03:00.0: L1 Enabled - LTR Disabled
helmi 27 00:03:24 kampela kernel: iwlwifi 0000:03:00.0: Radio type=0x1-0x2-0x0
helmi 27 00:03:25 kampela kernel: iwlwifi 0000:03:00.0: L1 Enabled - LTR Disabled
helmi 27 00:03:25 kampela kernel: iwlwifi 0000:03:00.0: L1 Enabled - LTR Disabled
helmi 27 00:03:25 kampela kernel: iwlwifi 0000:03:00.0: Radio type=0x1-0x2-0x0
helmi 27 00:03:25 kampela kernel: IPv6: ADDRCONF(NETDEV_UP): wlp3s0: link is not ready
helmi 27 00:03:28 kampela kernel: wlp3s0: authenticate with 10:6f:3f:38:cb:e0
helmi 27 00:03:28 kampela kernel: wlp3s0: send auth to 10:6f:3f:38:cb:e0 (try 1/3)
helmi 27 00:03:29 kampela kernel: wlp3s0: send auth to 10:6f:3f:38:cb:e0 (try 2/3)
helmi 27 00:03:30 kampela kernel: wlp3s0: send auth to 10:6f:3f:38:cb:e0 (try 3/3)
helmi 27 00:03:31 kampela kernel: wlp3s0: authentication with 10:6f:3f:38:cb:e0 timed out
helmi 27 00:03:34 kampela kernel: wlp3s0: authenticate with 10:6f:3f:38:cb:e0
helmi 27 00:03:34 kampela kernel: wlp3s0: send auth to 10:6f:3f:38:cb:e0 (try 1/3)
helmi 27 00:03:35 kampela kernel: wlp3s0: send auth to 10:6f:3f:38:cb:e0 (try 2/3)
helmi 27 00:03:36 kampela kernel: wlp3s0: send auth to 10:6f:3f:38:cb:e0 (try 3/3)
helmi 27 00:03:37 kampela kernel: wlp3s0: authentication with 10:6f:3f:38:cb:e0 timed out
helmi 27 00:03:41 kampela network[3712]: WPA association/authentication failed for interface 'wlp3s0'
helmi 27 00:03:41 kampela network[3712]: Failed to bring the network up for profile 'wlp3s0-Joutonetti'
helmi 27 00:03:41 kampela systemd[1]: netctl@wlp3s0\x2dJoutonetti.service: Main process exited, code=exited, status=1/FAILURE
helmi 27 00:03:41 kampela systemd[1]: Failed to start Networking for netctl profile wlp3s0-Joutonetti.
-- Subject: Unit netctl@wlp3s0\x2dJoutonetti.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit netctl@wlp3s0\x2dJoutonetti.service has failed.
--
-- The result is failed.
helmi 27 00:03:41 kampela systemd[1]: netctl@wlp3s0\x2dJoutonetti.service: Unit entered failed state.
helmi 27 00:03:41 kampela systemd[1]: netctl@wlp3s0\x2dJoutonetti.service: Failed with result 'exit-code'.
helmi 27 00:03:41 kampela sudo[3597]: pam_unix(sudo:session): session closed for user root
NETWORKMANAGER
==============
helmi 26 23:58:13 kampela NetworkManager[2508]: <info> [1488146293.1319] device (wlp3s0): Activation: starting connection 'Auto Joutonetti' (3580733a-1f62-45e8-96cb-3e20d25d6f68)
helmi 26 23:58:13 kampela NetworkManager[2508]: <info> [1488146293.1327] audit: op="connection-activate" uuid="3580733a-1f62-45e8-96cb-3e20d25d6f68" name="Auto Joutonetti" pid=3011 uid=1000 result="success"
helmi 26 23:58:13 kampela NetworkManager[2508]: <info> [1488146293.1333] device (wlp3s0): state change: disconnected -> prepare (reason 'none') [30 40 0]
helmi 26 23:58:13 kampela NetworkManager[2508]: <info> [1488146293.1336] manager: NetworkManager state is now CONNECTING
helmi 26 23:58:13 kampela NetworkManager[2508]: <info> [1488146293.1409] device (wlp3s0): set-hw-addr: set-cloned MAC address to 6C:88:14:16:16:3C (permanent)
helmi 26 23:58:13 kampela kernel: iwlwifi 0000:03:00.0: L1 Enabled - LTR Disabled
helmi 26 23:58:13 kampela kernel: iwlwifi 0000:03:00.0: L1 Enabled - LTR Disabled
helmi 26 23:58:13 kampela kernel: iwlwifi 0000:03:00.0: Radio type=0x1-0x2-0x0
helmi 26 23:58:13 kampela kernel: iwlwifi 0000:03:00.0: L1 Enabled - LTR Disabled
helmi 26 23:58:13 kampela kernel: iwlwifi 0000:03:00.0: L1 Enabled - LTR Disabled
helmi 26 23:58:13 kampela kernel: iwlwifi 0000:03:00.0: Radio type=0x1-0x2-0x0
helmi 26 23:58:13 kampela kernel: IPv6: ADDRCONF(NETDEV_UP): wlp3s0: link is not ready
helmi 26 23:58:13 kampela NetworkManager[2508]: <info> [1488146293.5608] device (wlp3s0): supplicant interface state: disconnected -> disabled
helmi 26 23:58:13 kampela NetworkManager[2508]: <info> [1488146293.5732] device (wlp3s0): supplicant interface state: disabled -> disconnected
helmi 26 23:58:13 kampela NetworkManager[2508]: <info> [1488146293.5740] device (wlp3s0): state change: prepare -> config (reason 'none') [40 50 0]
helmi 26 23:58:13 kampela NetworkManager[2508]: <info> [1488146293.5749] device (wlp3s0): Activation: (wifi) access point 'Auto Joutonetti' has security, but secrets are required.
helmi 26 23:58:13 kampela NetworkManager[2508]: <info> [1488146293.5754] device (wlp3s0): state change: config -> need-auth (reason 'none') [50 60 0]
helmi 26 23:58:13 kampela NetworkManager[2508]: <info> [1488146293.5921] device (wlp3s0): state change: need-auth -> prepare (reason 'none') [60 40 0]
helmi 26 23:58:13 kampela NetworkManager[2508]: <info> [1488146293.5943] device (wlp3s0): state change: prepare -> config (reason 'none') [40 50 0]
helmi 26 23:58:13 kampela NetworkManager[2508]: <info> [1488146293.5950] device (wlp3s0): Activation: (wifi) connection 'Auto Joutonetti' has security, and secrets exist. No new secrets needed.
helmi 26 23:58:13 kampela NetworkManager[2508]: <info> [1488146293.5954] Config: added 'ssid' value 'Joutonetti'
helmi 26 23:58:13 kampela NetworkManager[2508]: <info> [1488146293.5962] Config: added 'scan_ssid' value '1'
helmi 26 23:58:13 kampela NetworkManager[2508]: <info> [1488146293.5968] Config: added 'key_mgmt' value 'WPA-PSK'
helmi 26 23:58:13 kampela NetworkManager[2508]: <info> [1488146293.5972] Config: added 'psk' value '<omitted>'
helmi 26 23:58:13 kampela NetworkManager[2508]: <info> [1488146293.6068] sup-iface[0xd6b0c0,wlp3s0]: config: set interface ap_scan to 1
helmi 26 23:58:13 kampela NetworkManager[2508]: <info> [1488146293.6291] device (wlp3s0): supplicant interface state: disconnected -> scanning
helmi 26 23:58:16 kampela wpa_supplicant[642]: wlp3s0: SME: Trying to authenticate with 10:6f:3f:38:cb:e0 (SSID='Joutonetti' freq=2437 MHz)
helmi 26 23:58:16 kampela kernel: wlp3s0: authenticate with 10:6f:3f:38:cb:e0
helmi 26 23:58:16 kampela kernel: wlp3s0: send auth to 10:6f:3f:38:cb:e0 (try 1/3)
helmi 26 23:58:16 kampela NetworkManager[2508]: <info> [1488146296.7105] device (wlp3s0): supplicant interface state: scanning -> authenticating
helmi 26 23:58:17 kampela kernel: wlp3s0: send auth to 10:6f:3f:38:cb:e0 (try 2/3)
helmi 26 23:58:18 kampela kernel: wlp3s0: send auth to 10:6f:3f:38:cb:e0 (try 3/3)
helmi 26 23:58:19 kampela kernel: wlp3s0: authentication with 10:6f:3f:38:cb:e0 timed out
helmi 26 23:58:19 kampela wpa_supplicant[642]: wlp3s0: CTRL-EVENT-SSID-TEMP-DISABLED id=0 ssid="Joutonetti" auth_failures=1 duration=10 reason=CONN_FAILED
helmi 26 23:58:19 kampela NetworkManager[2508]: <info> [1488146299.5438] device (wlp3s0): supplicant interface state: authenticating -> disconnected
helmi 26 23:58:29 kampela NetworkManager[2508]: <info> [1488146309.5515] device (wlp3s0): supplicant interface state: disconnected -> scanning
helmi 26 23:58:29 kampela wpa_supplicant[642]: wlp3s0: CTRL-EVENT-SSID-REENABLED id=0 ssid="Joutonetti"
helmi 26 23:58:37 kampela wpa_supplicant[642]: wlp3s0: SME: Trying to authenticate with 10:6f:3f:38:cb:e0 (SSID='Joutonetti' freq=2437 MHz)
helmi 26 23:58:37 kampela kernel: wlp3s0: authenticate with 10:6f:3f:38:cb:e0
helmi 26 23:58:37 kampela kernel: wlp3s0: send auth to 10:6f:3f:38:cb:e0 (try 1/3)
helmi 26 23:58:37 kampela NetworkManager[2508]: <info> [1488146317.7083] device (wlp3s0): supplicant interface state: scanning -> authenticating
helmi 26 23:58:38 kampela kernel: wlp3s0: send auth to 10:6f:3f:38:cb:e0 (try 2/3)
helmi 26 23:58:39 kampela NetworkManager[2508]: <warn> [1488146319.1681] device (wlp3s0): Activation: (wifi) association took too long, failing activation
helmi 26 23:58:39 kampela NetworkManager[2508]: <info> [1488146319.1682] device (wlp3s0): state change: config -> failed (reason 'ssid-not-found') [50 120 53]
helmi 26 23:58:39 kampela NetworkManager[2508]: <info> [1488146319.1689] manager: NetworkManager state is now DISCONNECTED
helmi 26 23:58:39 kampela NetworkManager[2508]: <warn> [1488146319.1700] device (wlp3s0): Activation: failed for connection 'Auto Joutonetti'
helmi 26 23:58:39 kampela NetworkManager[2508]: <info> [1488146319.1712] device (wlp3s0): state change: failed -> disconnected (reason 'none') [120 30 0]
helmi 26 23:58:39 kampela wpa_supplicant[642]: wlp3s0: CTRL-EVENT-DISCONNECTED bssid=10:6f:3f:38:cb:e0 reason=3 locally_generated=1
helmi 26 23:58:39 kampela kernel: wlp3s0: aborting authentication with 10:6f:3f:38:cb:e0 by local choice (Reason: 3=DEAUTH_LEAVING)
helmi 26 23:58:39 kampela kernel: IPv6: ADDRCONF(NETDEV_UP): wlp3s0: link is not ready
helmi 26 23:58:39 kampela NetworkManager[2508]: <info> [1488146319.1796] device (wlp3s0): set-hw-addr: set MAC address to AE:F2:B4:C5:71:FD (scanning)
helmi 26 23:58:39 kampela kernel: iwlwifi 0000:03:00.0: L1 Enabled - LTR Disabled
helmi 26 23:58:39 kampela kernel: iwlwifi 0000:03:00.0: L1 Enabled - LTR Disabled
helmi 26 23:58:39 kampela kernel: iwlwifi 0000:03:00.0: Radio type=0x1-0x2-0x0
helmi 26 23:58:39 kampela kernel: iwlwifi 0000:03:00.0: L1 Enabled - LTR Disabled
helmi 26 23:58:39 kampela kernel: iwlwifi 0000:03:00.0: L1 Enabled - LTR Disabled
helmi 26 23:58:39 kampela kernel: iwlwifi 0000:03:00.0: Radio type=0x1-0x2-0x0
helmi 26 23:58:39 kampela kernel: IPv6: ADDRCONF(NETDEV_UP): wlp3s0: link is not ready
helmi 26 23:58:39 kampela NetworkManager[2508]: <warn> [1488146319.5657] sup-iface[0xd6b0c0,wlp3s0]: connection disconnected (reason -3)
helmi 26 23:58:39 kampela NetworkManager[2508]: <info> [1488146319.5667] device (wlp3s0): supplicant interface state: authenticating -> disconnected
helmi 26 23:58:39 kampela NetworkManager[2508]: <info> [1488146319.5885] device (wlp3s0): supplicant interface state: disconnected -> disabled
helmi 26 23:58:39 kampela NetworkManager[2508]: <info> [1488146319.5949] device (wlp3s0): supplicant interface state: disabled -> disconnected
答案1
这听起来很常见，只需使用 init 或 systemd（以适用者为准）重新启动网络管理器服务即可。
通常：
sudo service network-manager restart