启动 Ubuntu 12.04 64 位后，我无法连接到 Wifi，除非我断开连接并重新连接。这种情况已经持续了一段时间，但我终于厌倦了启动后重新连接，所以我试图修复它。在我努力排除故障的过程中，以下是我目前所得到的结果：
当 Wifi 不工作时，我无法 ping 本地网络地址
我以其他用户身份登录时遇到同样的行为
尽管如此，将 IPv6 设置更改为“忽略”没有任何效果
IPv6 Configure Timeout（请参阅下面的日志）。grep Network /var/log/syslog以下是Wifi 无法使用时我得到的结果：NetworkManager[1132]: <info> (wlan0): using nl80211 for WiFi device control NetworkManager[1132]: <info> (wlan0): new 802.11 WiFi device (driver: 'iwlwifi' ifindex: 3) NetworkManager[1132]: <info> (wlan0): exported as /org/freedesktop/NetworkManager/Devices/1 NetworkManager[1132]: <info> (wlan0): now managed NetworkManager[1132]: <info> (wlan0): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2] NetworkManager[1132]: <info> (wlan0): bringing up device. NetworkManager[1132]: <info> (wlan0): preparing device. NetworkManager[1132]: <info> (wlan0): deactivating device (reason 'managed') [2] NetworkManager[1132]: <warn> /sys/devices/virtual/net/lxcbr0: couldn't determine device driver; ignoring... NetworkManager[1132]: <info> wpa_supplicant started NetworkManager[1132]: SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/lxcbr0, iface: lxcbr0) NetworkManager[1132]: SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/lxcbr0, iface: lxcbr0): no ifupdown configuration found. NetworkManager[1132]: <warn> /sys/devices/virtual/net/lxcbr0: couldn't determine device driver; ignoring... NetworkManager[1132]: <info> (wlan0): supplicant interface state: starting -> ready NetworkManager[1132]: <info> (wlan0): device state change: unavailable -> disconnected (reason 'supplicant-available') [20 30 42] NetworkManager[1132]: <info> (wlan0): supplicant interface state: ready -> inactive NetworkManager[1132]: <warn> Trying to remove a non-existant call id. NetworkManager[1132]: SCPlugin-Ifupdown: devices added (path: /sys/devices/virtual/net/virbr0, iface: virbr0) NetworkManager[1132]: SCPlugin-Ifupdown: device added (path: /sys/devices/virtual/net/virbr0, iface: virbr0): no ifupdown configuration found. NetworkManager[1132]: <warn> /sys/devices/virtual/net/virbr0: couldn't determine device driver; ignoring... NetworkManager[1132]: <info> Auto-activating connection 'Skylab'. NetworkManager[1132]: <info> Activation (wlan0) starting connection 'Skylab' NetworkManager[1132]: <info> (wlan0): device state change: disconnected -> prepare (reason 'none') [30 40 0] NetworkManager[1132]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) scheduled... NetworkManager[1132]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) started... NetworkManager[1132]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) scheduled... NetworkManager[1132]: <info> Activation (wlan0) Stage 1 of 5 (Device Prepare) complete. NetworkManager[1132]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) starting... NetworkManager[1132]: <info> (wlan0): device state change: prepare -> config (reason 'none') [40 50 0] NetworkManager[1132]: <info> Activation (wlan0/wireless): connection 'Skylab' has security, and secrets exist. No new secrets needed. NetworkManager[1132]: <info> Config: added 'ssid' value 'Skylab' NetworkManager[1132]: <info> Config: added 'scan_ssid' value '1' NetworkManager[1132]: <info> Config: added 'key_mgmt' value 'WPA-PSK' NetworkManager[1132]: <info> Config: added 'psk' value '<omitted>' NetworkManager[1132]: <info> Activation (wlan0) Stage 2 of 5 (Device Configure) complete. NetworkManager[1132]: <info> Config: set interface ap_scan to 1 NetworkManager[1132]: <info> (wlan0): supplicant interface state: inactive -> scanning NetworkManager[1132]: <info> (wlan0): supplicant interface state: scanning -> associating NetworkManager[1132]: <info> (wlan0): supplicant interface state: associating -> associated NetworkManager[1132]: <info> (wlan0): supplicant interface state: associated -> 4-way handshake NetworkManager[1132]: <info> (wlan0): supplicant interface state: 4-way handshake -> completed NetworkManager[1132]: <info> Activation (wlan0/wireless) Stage 2 of 5 (Device Configure) successful. Connected to wireless network 'Skylab'. NetworkManager[1132]: <info> Activation (wlan0) Stage 3 of 5 (IP Configure Start) scheduled. NetworkManager[1132]: <info> Activation (wlan0) Stage 3 of 5 (IP Configure Start) started... NetworkManager[1132]: <info> (wlan0): device state change: config -> ip-config (reason 'none') [50 70 0] NetworkManager[1132]: <info> Activation (wlan0) Beginning DHCPv4 transaction (timeout in 45 seconds) NetworkManager[1132]: <info> dhclient started with pid 2157 NetworkManager[1132]: <info> Activation (wlan0) Beginning IP6 addrconf. NetworkManager[1132]: <info> Activation (wlan0) Stage 3 of 5 (IP Configure Start) complete. NetworkManager[1132]: <info> (wlan0): DHCPv4 state changed nbi -> preinit NetworkManager[1132]: <info> (wlan0): DHCPv4 state changed preinit -> reboot NetworkManager[1132]: <info> address 192.168.2.9 NetworkManager[1132]: <info> prefix 24 (255.255.255.0) NetworkManager[1132]: <info> gateway 192.168.2.1 NetworkManager[1132]: <info> nameserver '192.168.2.1' NetworkManager[1132]: <info> domain name 'Belkin' NetworkManager[1132]: <info> Activation (wlan0) Stage 5 of 5 (IPv4 Configure Commit) scheduled... NetworkManager[1132]: <info> Activation (wlan0) Stage 5 of 5 (IPv4 Commit) started... NetworkManager[1132]: <info> DNS: starting dnsmasq... NetworkManager[1132]: <info> (wlan0): writing resolv.conf to /sbin/resolvconf NetworkManager[1132]: <info> (wlan0): device state change: ip-config -> activated (reason 'none') [70 100 0] NetworkManager[1132]: <info> Policy set 'Skylab' (wlan0) as default for IPv4 routing and DNS. NetworkManager[1132]: <info> Activation (wlan0) successful, device activated. NetworkManager[1132]: <info> Activation (wlan0) Stage 5 of 5 (IPv4 Commit) complete. NetworkManager[1132]: <info> (wlan0): IP6 addrconf timed out or failed. NetworkManager[1132]: <info> Activation (wlan0) Stage 4 of 5 (IPv6 Configure Timeout) scheduled... NetworkManager[1132]: <info> Activation (wlan0) Stage 4 of 5 (IPv6 Configure Timeout) started... NetworkManager[1132]: <info> Activation (wlan0) Stage 4 of 5 (IPv6 Configure Timeout) complete.其余内容仅在 Wifi 不工作时出现：
NetworkManager[1132]: <info> Activation (wlan0) Stage 5 of 5 (IPv4 Configure Commit) scheduled... NetworkManager[1132]: <info> Activation (wlan0) Stage 5 of 5 (IPv4 Commit) started... NetworkManager[1132]: <info> DNS: starting dnsmasq... NetworkManager[1132]: <info> (wlan0): writing resolv.conf to /sbin/resolvconf NetworkManager[1132]: <info> (wlan0): device state change: ip-config -> activated (reason 'none') [70 100 0] NetworkManager[1132]: <info> Policy set 'Skylab' (wlan0) as default for IPv4 routing and DNS. NetworkManager[1132]: <info> Activation (wlan0) successful, device activated. NetworkManager[1132]: <info> Activation (wlan0) Stage 5 of 5 (IPv4 Commit) complete.以下是通过 lspci -v 获取的有关我的无线网卡的信息：
08:00.0 Network controller: Intel Corporation Centrino Wireless-N 1000 Subsystem: Intel Corporation Centrino Wireless-N 1000 BGN Flags: bus master, fast devsel, latency 0, IRQ 44 Memory at d1d00000 (64-bit, non-prefetchable) [size=8K] Capabilities: [c8] Power Management version 3 Capabilities: [d0] MSI: Enable+ Count=1/1 Maskable- 64bit+ Capabilities: [e0] Express Endpoint, MSI 00 Capabilities: [100] Advanced Error Reporting Capabilities: [140] Device Serial Number 74-e5-0b-ff-ff-7d-3a-38 Kernel driver in use: iwlwifi Kernel modules: iwlwifi
不知道该怎么做，任何帮助都值得感激，包括故障排除技巧。提前致谢。
答案1
相同的操作系统，相同的问题，但将 IP6 设置为“忽略”对我有用。也许您必须重新登录才能使其生效？
答案2
这可能是 iwlwifi 驱动程序已知的电源管理问题。如果是这样，那么当笔记本电脑插入电源时不会出现此问题。
查找类似问题https://bugs.launchpad.net/ubuntu/+source/linux/+bugs?field.searchtext=iwlwifi