linux重启无线网络连接,Ubuntu无线网络重启或者重新安装系统后，检测不到Wi-Fi问题...

Version：Ubuntu 16.10

Computer：Acer ASPIRE 4750G

Wireless adapter: Qualcomm Atheros AR9287 Wireless Network Adapter (PCI-Express) (rev01)

问题描述：重启或者重新安装系统后，检测不到Wi-Fi。具体表现为右上角Wi-Fi网络连接的图标是空的，没有半圈半圈的线。点击能够启动联网和启动Wi-Fi，但是就是检测不到任何的Wi-Fi。

问题分析：在终端输入 sudo lshw -C network ，提示无线网络不可用，得到的结果类似于：

*-network DISABLED

description: Wireless interface

product: AR9287 Wireless Network Adapter (PCI-Express)

vendor: Atheros Communications INc.

physical id: 0

bus info: pci@0000:06:00.0

logical name: wlan0

version: 01

serial: the-number

width: 64 bits

clock: 33MHz

capabilities: pm msi pciexpress bus_master cap_list enternet physical wireless

configureation: broadcast=yes driver=ath9k driverversion=2.6.38-8-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn

resources: irq: 17 memory:d0200000-d020ffff

解决方法：

Try blacklisting the  acer-wmi  kernel module.

sudo gedit /etc/modprobe.d/blacklist.conf

add  blacklist acer_wmi  as a new line at the bottom of this file.

Then reboot.

原理：

edit:

The acer-wmi kernel module enables you to control the following:

the wireless LAN card radio

inbuilt Bluetooth adapter

inbuilt 3G card

mail LED of your laptop

brightness of the LCD panel

With regards to wireless, all  acer-wmi  does is enable the radio on the card. It is not responsible for the wireless LED - once the radio is enabled, this is down to the wireless driver for your card.

However for some acer laptop models - there is a conflict between the Acer firmware and the kernel implementation. This is why you need to blacklist.

一些网络调试的命令和方法：

uname -a

lspci

sudo lspci -vvnn

sudo lshw -C network

iwconfig //查看网络配置文件

dig www.baidu.com

sudo iwlist scanning //扫描电脑周边所有可看到的无线网络

ls -l /etc/NetworkManager/system-connections //查看已有的无线网络的配置文件

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