在ThinkPad X201i用ubuntu16.04已经很久了, wifi连接一直不稳定, 用几分钟就自动断开, 无奈只能重连. 查询无线网卡具体情况如下:
$ lspci
02:00.0 Network controller: Intel Corporation Centrino Wireless-N 1000 [Condor Peak]
$ sudo lshw -class network
*-network
description: Wireless interface
product: Centrino Wireless-N 1000 [Condor Peak]
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:02:00.0
logical name: wlp2s0
version: 00
serial: 00:26:c7:69:8d:d0
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=4.13.0-26-generic firmware=39.31.5.1 build 35138 ip=192.168.0.107 latency=0 link=yes multicast=yes wireless=IEEE 802.11
resources: irq:28 memory:f2400000-f2401fff
第一走
将/etc/ppp/options 文件中的 lcp-echo-failure 4 改为 lcp-echo-failure 40
第二走, 把无线网卡的power management 关掉. 试过之后效果明显, 基本上没再掉过线:
关掉之前查看wifi连接情况如下
$ sudo iwconfig
enp0s25 no wireless extensions.
wlp2s0 IEEE 802.11 ESSID:"wonderful_world"
Mode:Managed Frequency:2.462 GHz Access Point: 8C:A6:DF:AE:E0:17
Bit Rate=121.5 Mb/s Tx-Power=14 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:on
Link Quality=70/70 Signal level=-40 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:115 Invalid misc:121 Missed beacon:0
lo no wireless extensions.
关掉wifi的power management
$ sudo iwconfig wlp2s0 power off
查看关掉之后的WiFi情况
$ sudo iwconfig
enp0s25 no wireless extensions.
wlp2s0 IEEE 802.11 ESSID:"wonderful_world"
Mode:Managed Frequency:2.462 GHz Access Point: 8C:A6:DF:AE:E0:17
Bit Rate=121.5 Mb/s Tx-Power=14 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Encryption key:off
Power Management:off
Link Quality=70/70 Signal level=-31 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:119 Invalid misc:132 Missed beacon:0
lo no wireless extensions.