具体提示如下：
Error: Connection activation failed: 需要密钥，但未提供.
但我连接的 wifi 根本就没有加密。
有时候关掉再重启 Wi-Fi 就好了。有时候这样也不行
虽然有点突兀，但是我有点怀疑是硬件问题。
我用的是archlinux，顺带询问一下有没有看 man pages 的指导之类的东西，每次看man pages的时候都一头雾水，不知道该怎么看……
这是我连不上时候的dmesg 我不知道具体哪条是。
[ 384.112121] wlan0: cannot understand ECSA IE operating class, 30, ignoring
[ 384.215260] wlan0: cannot understand ECSA IE operating class, 30, ignoring
[ 388.001601] wlan0: authenticate with 1e:2e:fa:14:31:ca (local address=00:c2:c6:5c:4a:04)
[ 388.001614] wlan0: send auth to 1e:2e:fa:14:31:ca (try 1/3)
[ 388.129515] wlan0: send auth to 1e:2e:fa:14:31:ca (try 2/3)
[ 388.192337] wlan0: authenticated
[ 388.193485] wlan0: associate with 1e:2e:fa:14:31:ca (try 1/3)
[ 388.227544] wlan0: RX AssocResp from 1e:2e:fa:14:31:ca (capab=0x1431 status=0 aid=8)
[ 388.230122] wlan0: associated
[ 388.395271] wlan0: Limiting TX power to 23 (23 - 0) dBm as advertised by 1e:2e:fa:14:31:ca
[ 393.566672] wlan0: deauthenticating from 1e:2e:fa:14:31:ca by local choice (Reason: 3=DEAUTH_LEAVING)
[ 393.720091] wlan0: authenticate with d4:38:9c:40:fc:20 (local address=00:c2:c6:5c:4a:04)
[ 393.720110] wlan0: send auth to d4:38:9c:40:fc:20 (try 1/3)
[ 393.723436] wlan0: authenticated
[ 393.723462] wlan0: waiting for beacon from d4:38:9c:40:fc:20
[ 394.856216] wlan0: authenticate with 1e:2e:fa:14:31:ca (local address=00:c2:c6:5c:4a:04)
[ 394.856222] wlan0: send auth to 1e:2e:fa:14:31:ca (try 1/3)
[ 394.864806] wlan0: authenticated
[ 394.865399] wlan0: associate with 1e:2e:fa:14:31:ca (try 1/3)
[ 394.897099] wlan0: RX AssocResp from 1e:2e:fa:14:31:ca (capab=0x1431 status=0 aid=9)
[ 394.903699] wlan0: associated
[ 394.950837] wlan0: Limiting TX power to 23 (23 - 0) dBm as advertised by 1e:2e:fa:14:31:ca
[ 406.704595] wlan0: deauthenticating from 1e:2e:fa:14:31:ca by local choice (Reason: 3=DEAUTH_LEAVING)
[ 408.003375] wlan0: authenticate with 1e:2e:fa:14:31:ca (local address=00:c2:c6:5c:4a:04)
[ 408.003382] wlan0: send auth to 1e:2e:fa:14:31:ca (try 1/3)
[ 408.122547] wlan0: authenticated
[ 408.123414] wlan0: associate with 1e:2e:fa:14:31:ca (try 1/3)
[ 408.208658] wlan0: RX AssocResp from 1e:2e:fa:14:31:ca (capab=0x1431 status=0 aid=10)
[ 408.250590] wlan0: associated
[ 408.464912] wlan0: Limiting TX power to 23 (23 - 0) dBm as advertised by 1e:2e:fa:14:31:ca
[ 418.557720] wlan0: deauthenticating from 1e:2e:fa:14:31:ca by local choice (Reason: 3=DEAUTH_LEAVING)
[ 418.781954] wlan0: authenticate with d4:38:9c:40:fc:20 (local address=00:c2:c6:5c:4a:04)
[ 418.781964] wlan0: send auth to d4:38:9c:40:fc:20 (try 1/3)
[ 418.800035] wlan0: authenticated
[ 418.800417] wlan0: associate with d4:38:9c:40:fc:20 (try 1/3)
[ 418.835860] wlan0: RX AssocResp from d4:38:9c:40:fc:20 (capab=0x1421 status=0 aid=2)
[ 418.879933] wlan0: associated