现象：1) 点击任务栏的无线图标，点击开启会多次返回关闭，偶尔可以正常打开，但找不到网络。
2) 重启网卡管理服务，仍然显示Down
root@xxx-PC:systemctl restart network-manager
root@xxx-PC:/home/xxx# ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1 link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: wlp2s0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000 link/ether a0:af:bd:68:54:d9 brd ff:ff:ff:ff:ff:ff
解决方法：
echo "blacklist acer_wmi" >/etc/modprobe.d/blacklist-bcm43.conf update-initramfs -u reboot