待机后 Wi-Fi 频繁断开问题排查

问题描述#

Debian 系统待机了几天，终端中出现了以下错误信息：

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root@xh-8745:~# [54752.126446] iwlwifi 0000:04:00.0: No beacon heard and the session protection is over already...
2
[54755.308518] iwlwifi 0000:04:00.0: No beacon heard and the session protection is over already...
3
[142103.828226] iwlwifi 0000:04:00.0: Unhandled alg:0x3f0707
4
[142103.829683] iwlwifi 0000:04:00.0: Unhandled alg:0x3f0707
5
[519059.901737] iwlwifi 0000:04:00.0: No beacon heard and the session protection is over already...
6
[732665.451691] iwluifi 0000:04:00.0: Not associated and the session protection is over already...
7
[740482.146316] iwlwifi 0000:04:00.0: Not associated and the session protection is over already...
8
[748394.177118] iwlwifi 0000:04:00.0: Not associated and the session protection is over already...
9
[756106.464972] iwlwifi 0000:04:00.0: Not associated and the session protection is over already...
10
[761989.387681] iwlwifi 0000:04:00.0: Not associated and the session protection is over already...

查询 AI 后怀疑是频繁断网问题。路由器经确认无异常，其他设备连接状态正常。

排查步骤#

1. 查看无线网卡状态#

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root@xh-8745:/home/xh# iwconfig wlp4s0
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wlp4s0 IEEE 802.11 ESSID:"k3p" Mode:Managed Frequency:5.18 GHz Access Point: 6A:34:26:12:7A:0E Bit Rate=1.1342 Gb/s Tx-Power=22 dBm Retry short limit:7 RTS thr:off Fragment thr:off Encryption key:off Power Management:on Link Quality=70/70 Signal level=-34 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:58 Missed beacon:0

2. 问题定位#

发现 Power Management:on，即 Wi-Fi 省电模式已开启，这可能是导致频繁断网的原因。

3. 解决方案：关闭 Wi-Fi 省电模式#

方案一：临时关闭（重启后失效）#

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iwconfig wlp4s0 power off

方案二：永久关闭#

修改 NetworkManager 配置文件：

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vim /etc/NetworkManager/conf.d/wifi-powersave.conf

添加以下内容：

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[connection]
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wifi.powersave = 2

参数说明：

值	含义
0	默认
1	忽略
2	禁用（推荐）
3	启用

4. 生效配置#

修改完成后重启 NetworkManager：

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systemctl restart NetworkManager

5. 验证结果#

检查省电模式是否已关闭：

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iwconfig wlp4s0 | grep Power

输出 Power Management:off 即表示设置成功。

后续观察#

待机和重启后持续观察是否还有类似报错。