wifi unavailable，无法连接 wifi

**镜像环境**

当前镜像 以mainline 版本为基线：

1、内核版本：[raspberrrypi-kernel](https://gitee.com/openeuler/raspberrypi-kernel/tree/openEuler-Mainline-raspi/)，基于 [openEuler 20.09（4.19.138-2008.1.0）](https://gitee.com/openeuler/kernel/tree/4.19.138-2008.1.0/)。

2、对外公开源地址：<http://119.3.219.20:82/openEuler:/Mainline/>，安装 NetworkManager-1:1.26.0-1.oe1

**出现问题：wifi 无法使用**

1、nmcli dev show wlan0，提示 wlan0 状态为：20 (unavailable)
2、nmcli dev wifi，显示可连接的 wifi 信息为空
4、nmcli dev wifi connect SSID password PASSWORD，提示找不到对应 SSID
5、查看 NetworkManager 服务状态：
```
● NetworkManager.service - Network Manager
     Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; vendor preset: enabled)
    Drop-In: /usr/lib/systemd/system/NetworkManager.service.d
             └─NetworkManager-ovs.conf
     Active: active (running) since Fri 2020-07-31 03:02:41 CST; 3 weeks 6 days ago
       Docs: man:NetworkManager(8)
   Main PID: 913 (NetworkManager)
      Tasks: 3 (limit: 4256)
     Memory: 19.9M
     CGroup: /system.slice/NetworkManager.service
             └─913 /usr/sbin/NetworkManager --no-daemon

Jul 31 03:03:04 openEuler NetworkManager[913]: <error> [1596135784.6985] device (wlan0): Couldn't initialize supplicant interface: Timeout was reached
Jul 31 03:03:14 openEuler NetworkManager[913]: <warn>  [1596135794.6889] device (wlan0): re-acquiring supplicant interface (#2).
Jul 31 03:03:19 openEuler NetworkManager[913]: <error> [1596135799.6931] device (wlan0): Couldn't initialize supplicant interface: Timeout was reached
Jul 31 03:03:29 openEuler NetworkManager[913]: <warn>  [1596135809.6914] device (wlan0): re-acquiring supplicant interface (#3).
Jul 31 03:03:34 openEuler NetworkManager[913]: <error> [1596135814.6972] device (wlan0): Couldn't initialize supplicant interface: Timeout was reached
Jul 31 03:03:44 openEuler NetworkManager[913]: <warn>  [1596135824.6977] device (wlan0): re-acquiring supplicant interface (#4).
Jul 31 03:03:49 openEuler NetworkManager[913]: <error> [1596135829.7036] device (wlan0): Couldn't initialize supplicant interface: Timeout was reached
Jul 31 03:03:59 openEuler NetworkManager[913]: <warn>  [1596135839.6980] device (wlan0): re-acquiring supplicant interface (#5).
Jul 31 03:04:04 openEuler NetworkManager[913]: <error> [1596135844.7039] device (wlan0): Couldn't initialize supplicant interface: Timeout was reached
Jul 31 03:04:04 openEuler NetworkManager[913]: <info>  [1596135844.7041] device (wlan0): supplicant interface keeps failing, giving up
```

**当前解决方式1：重启 NetworkManager 服务**

`systemctl restart NetworkManager`

但是，树莓派重启后问题依旧。

**当前解决方式2：回退 NetworkManager 版本**

安装当前 [20.03-LTS 的软件源](https://repo.openeuler.org/openEuler-20.03-LTS/OS/aarch64/Packages/) 中低版本的 NetworkManager-1.16.0-7后，重启 NetworkManager 服务：`systemctl restart NetworkManager`

**具体原因待解决**

openEuler/raspberrypi

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