我的笔记本电脑与 5Ghz AP 配合得很好，XYZ_5G但突然它停止连接到该 AP。请注意，其他设备与 配合得很好XYZ_5G。笔记本电脑目前已连接到XYZAP（2.4Ghz）。我仍然可以XYZ_5G在 AP 列表中看到。
XYZ_5G频道是 149 @ 80Mhz，路由器没有切换该频道。（iwlist 频道没有显示 149）- 我的路由器对笔记本电脑的 MAC 地址没有任何限制（我是管理员）。
完整的无线信息：https://paste.ubuntu.com/p/BCH5RB2mym/ （使用创建https://github.com/UbuntuForums/wireless-info）
##### release ###########################
Distributor ID: Ubuntu
Description: Ubuntu 18.04.5 LTS
Release: 18.04
Codename: bionic
##### kernel ############################
Linux 4.15.0-1099-oem #109-Ubuntu SMP Wed Oct 7 14:11:31 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Parameters: ro, mem_sleep_default=deep, usbcore.quirks=2386:3119:k, quiet, splash, vt.handoff=1
##### NetworkManager info ###############
GENERAL.DEVICE: wlp2s0
GENERAL.TYPE: wifi
GENERAL.NM-TYPE: NMDeviceWifi
GENERAL.VENDOR: Qualcomm Atheros
GENERAL.PRODUCT: QCA9377 802.11ac Wireless Network Adapter
GENERAL.DRIVER: ath10k_pci
GENERAL.DRIVER-VERSION: 4.15.0-1099-oem
GENERAL.FIRMWARE-VERSION: WLAN.TF.2.1-00021-QCARMSWP-1
GENERAL.HWADDR: <MAC 'wlp2s0' [IF2]>
...
##### iw reg get ########################
Region: Asia/Karachi (based on set time zone)
global
country 00: DFS-UNSET
(2402 - 2472 @ 40), (N/A, 20), (N/A)
(2457 - 2482 @ 20), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
(2474 - 2494 @ 20), (N/A, 20), (N/A), NO-OFDM, PASSIVE-SCAN
(5170 - 5250 @ 80), (N/A, 20), (N/A), AUTO-BW, PASSIVE-SCAN
(5250 - 5330 @ 80), (N/A, 20), (0 ms), DFS, AUTO-BW, PASSIVE-SCAN
(5490 - 5730 @ 160), (N/A, 20), (0 ms), DFS, PASSIVE-SCAN
(5735 - 5835 @ 80), (N/A, 20), (N/A), PASSIVE-SCAN
(57240 - 63720 @ 2160), (N/A, 0), (N/A)
##### iwlist channels ###################
lo no frequency information.
enp1s0 no frequency information.
wlp2s0 32 channels in total; available frequencies :
Channel 01 : 2.412 GHz
Channel 02 : 2.417 GHz
Channel 03 : 2.422 GHz
Channel 04 : 2.427 GHz
Channel 05 : 2.432 GHz
Channel 06 : 2.437 GHz
Channel 07 : 2.442 GHz
Channel 08 : 2.447 GHz
Channel 09 : 2.452 GHz
Channel 10 : 2.457 GHz
Channel 11 : 2.462 GHz
Channel 12 : 2.467 GHz
Channel 13 : 2.472 GHz
Channel 36 : 5.18 GHz
Channel 40 : 5.2 GHz
Channel 44 : 5.22 GHz
Channel 48 : 5.24 GHz
Channel 52 : 5.26 GHz
Channel 56 : 5.28 GHz
Channel 60 : 5.3 GHz
Channel 64 : 5.32 GHz
Channel 100 : 5.5 GHz
Channel 104 : 5.52 GHz
Channel 108 : 5.54 GHz
Channel 112 : 5.56 GHz
Channel 116 : 5.58 GHz
Channel 120 : 5.6 GHz
Channel 124 : 5.62 GHz
Channel 128 : 5.64 GHz
Channel 132 : 5.66 GHz
Channel 136 : 5.68 GHz
Channel 140 : 5.7 GHz
Current Frequency:2.427 GHz (Channel 4)
##### iwlist scan #######################
lo Interface doesn't support scanning.
enp1s0 Interface doesn't support scanning.
Channel occupancy:
1 APs on Frequency:2.417 GHz (Channel 2)
1 APs on Frequency:2.427 GHz (Channel 4)
1 APs on Frequency:2.447 GHz (Channel 8)
1 APs on Frequency:2.452 GHz (Channel 9)
1 APs on Frequency:2.462 GHz (Channel 11)
1 APs on Frequency:5.745 GHz
wlp2s0 Scan completed :
Cell 01 - Address: <MAC 'XYZ' [AC1]>
Channel:4
Frequency:2.427 GHz (Channel 4)
Quality=70/70 Signal level=-31 dBm
Encryption key:on
ESSID:"XYZ"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
24 Mb/s; 36 Mb/s; 54 Mb/s
Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s
Mode:Master
Extra:tsf=000000017bf6a85b
Extra: Last beacon: 5476ms ago
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : CCMP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : PSK
Cell 02 - Address: <MAC 'AP2' [AC2]>
Channel:2
Frequency:2.417 GHz (Channel 2)
Quality=27/70 Signal level=-83 dBm
Encryption key:on
ESSID:"AP2"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
11 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=0000004ec69d6f4b
Extra: Last beacon: 6880ms ago
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : CCMP TKIP
Authentication Suites (1) : PSK
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : CCMP TKIP
Authentication Suites (1) : PSK
Cell 03 - Address: <MAC 'AP3' [AC3]>
Channel:9
Frequency:2.452 GHz (Channel 9)
Quality=25/70 Signal level=-85 dBm
Encryption key:on
ESSID:"AP3"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
11 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=00000049cc5aface
Extra: Last beacon: 6156ms ago
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : CCMP TKIP
Authentication Suites (1) : PSK
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : CCMP TKIP
Authentication Suites (1) : PSK
Cell 04 - Address: <MAC 'AP4' [AC4]>
Channel:8
Frequency:2.447 GHz (Channel 8)
Quality=19/70 Signal level=-91 dBm
Encryption key:on
ESSID:"AP4"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=000000083492e17e
Extra: Last beacon: 6236ms ago
IE: WPA Version 1
Group Cipher : CCMP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : PSK
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : CCMP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : PSK
Cell 05 - Address: <MAC 'AP5' [AC5]>
Channel:11
Frequency:2.462 GHz (Channel 11)
Quality=48/70 Signal level=-62 dBm
Encryption key:on
ESSID:"AP5"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
24 Mb/s; 36 Mb/s; 54 Mb/s
Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s
Mode:Master
Extra:tsf=00000051c0634be0
Extra: Last beacon: 5768ms ago
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : CCMP TKIP
Authentication Suites (1) : PSK
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : CCMP TKIP
Authentication Suites (1) : PSK
Cell 06 - Address: <MAC 'XYZ_5G' [AC6]>
Channel:149
Frequency:5.745 GHz
Quality=70/70 Signal level=-39 dBm
Encryption key:on
ESSID:"XYZ_5G"
Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s
36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=000000017c46149d
Extra: Last beacon: 1136ms ago
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : CCMP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : PSK
##### dmesg #############################
[ 117.298284] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 3/3)
[ 117.299714] wlp2s0: authentication with <MAC 'XYZ_5G' [AC6]> timed out
[ 132.177320] wlp2s0: authenticate with <MAC 'XYZ_5G' [AC6]>
[ 132.208373] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 1/3)
[ 132.209849] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 2/3)
[ 132.211127] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 3/3)
[ 132.212368] wlp2s0: authentication with <MAC 'XYZ_5G' [AC6]> timed out
[ 143.008477] IPv6: ADDRCONF(NETDEV_UP): wlp2s0: link is not ready
[ 147.093846] wlp2s0: authenticate with <MAC 'XYZ_5G' [AC6]>
[ 147.125086] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 1/3)
[ 147.126428] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 2/3)
[ 147.127750] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 3/3)
[ 147.129000] wlp2s0: authentication with <MAC 'XYZ_5G' [AC6]> timed out
[ 161.985223] wlp2s0: authenticate with <MAC 'XYZ_5G' [AC6]>
[ 162.016043] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 1/3)
[ 162.017383] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 2/3)
[ 162.018780] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 3/3)
[ 162.020144] wlp2s0: authentication with <MAC 'XYZ_5G' [AC6]> timed out
[ 172.008993] IPv6: ADDRCONF(NETDEV_UP): wlp2s0: link is not ready
[ 229.790920] wlp2s0: authenticate with <MAC 'XYZ' [AC1]>
[ 229.836363] wlp2s0: send auth to <MAC 'XYZ' [AC1]> (try 1/3)
[ 229.838518] wlp2s0: authenticated
[ 229.841624] wlp2s0: associate with <MAC 'XYZ' [AC1]> (try 1/3)
[ 229.845030] wlp2s0: RX AssocResp from <MAC 'XYZ' [AC1]> (capab=0x1411 status=0 aid=2)
[ 229.847864] wlp2s0: associated
[ 229.935923] IPv6: ADDRCONF(NETDEV_CHANGE): wlp2s0: link becomes ready
[ 253.275519] wlp2s0: deauthenticating from <MAC 'XYZ' [AC1]> by local choice (Reason: 3=DEAUTH_LEAVING)
[ 253.320555] wlp2s0: authenticate with <MAC 'XYZ_5G' [AC6]>
[ 253.351926] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 1/3)
[ 254.781635] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 2/3)
[ 255.338805] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 3/3)
[ 255.339976] wlp2s0: authentication with <MAC 'XYZ_5G' [AC6]> timed out
[ 260.310559] wlp2s0: authenticate with <MAC 'XYZ_5G' [AC6]>
[ 260.341342] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 1/3)
[ 260.342980] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 2/3)
[ 260.344510] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 3/3)
[ 260.345893] wlp2s0: authentication with <MAC 'XYZ_5G' [AC6]> timed out
[ 265.711475] wlp2s0: authenticate with <MAC 'XYZ_5G' [AC6]>
[ 265.742865] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 1/3)
[ 265.744264] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 2/3)
[ 265.745827] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 3/3)
[ 265.747139] wlp2s0: authentication with <MAC 'XYZ_5G' [AC6]> timed out
[ 271.616293] wlp2s0: authenticate with <MAC 'XYZ_5G' [AC6]>
[ 271.647357] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 1/3)
[ 271.649619] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 2/3)
[ 271.651038] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 3/3)
[ 271.652408] wlp2s0: authentication with <MAC 'XYZ_5G' [AC6]> timed out
[ 279.008406] IPv6: ADDRCONF(NETDEV_UP): wlp2s0: link is not ready
[ 281.552270] wlp2s0: authenticate with <MAC 'XYZ' [AC1]>
[ 281.598367] wlp2s0: send auth to <MAC 'XYZ' [AC1]> (try 1/3)
[ 281.600132] wlp2s0: authenticated
[ 281.601668] wlp2s0: associate with <MAC 'XYZ' [AC1]> (try 1/3)
[ 281.605315] wlp2s0: RX AssocResp from <MAC 'XYZ' [AC1]> (capab=0x1411 status=0 aid=2)
[ 281.608139] wlp2s0: associated
[ 281.618416] IPv6: ADDRCONF(NETDEV_CHANGE): wlp2s0: link becomes ready
[ 1025.763634] wlp2s0: deauthenticating from <MAC 'XYZ' [AC1]> by local choice (Reason: 3=DEAUTH_LEAVING)
[ 1026.150392] wlp2s0: authenticate with <MAC 'XYZ_5G' [AC6]>
[ 1026.182133] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 1/3)
[ 1026.183643] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 2/3)
[ 1026.185104] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 3/3)
[ 1026.186617] wlp2s0: authentication with <MAC 'XYZ_5G' [AC6]> timed out
[ 1031.256747] wlp2s0: authenticate with <MAC 'XYZ_5G' [AC6]>
[ 1031.287290] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 1/3)
[ 1031.288737] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 2/3)
[ 1031.290210] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 3/3)
[ 1031.291547] wlp2s0: authentication with <MAC 'XYZ_5G' [AC6]> timed out
[ 1036.648906] wlp2s0: authenticate with <MAC 'XYZ_5G' [AC6]>
[ 1036.679379] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 1/3)
[ 1036.681077] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 2/3)
[ 1036.682569] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 3/3)
[ 1036.684122] wlp2s0: authentication with <MAC 'XYZ_5G' [AC6]> timed out
[ 1042.537265] wlp2s0: authenticate with <MAC 'XYZ_5G' [AC6]>
[ 1042.567772] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 1/3)
[ 1042.569136] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 2/3)
[ 1042.570573] wlp2s0: send auth to <MAC 'XYZ_5G' [AC6]> (try 3/3)
[ 1042.571816] wlp2s0: authentication with <MAC 'XYZ_5G' [AC6]> timed out
[ 1051.195209] IPv6: ADDRCONF(NETDEV_UP): wlp2s0: link is not ready
[ 1052.495304] wlp2s0: authenticate with <MAC 'XYZ' [AC1]>
[ 1052.543362] wlp2s0: send auth to <MAC 'XYZ' [AC1]> (try 1/3)
[ 1052.545076] wlp2s0: authenticated
[ 1052.552213] wlp2s0: associate with <MAC 'XYZ' [AC1]> (try 1/3)
[ 1052.555583] wlp2s0: RX AssocResp from <MAC 'XYZ' [AC1]> (capab=0x1411 status=0 aid=2)
[ 1052.558066] wlp2s0: associated
[ 1052.566497] IPv6: ADDRCONF(NETDEV_CHANGE): wlp2s0: link becomes ready
更新＃1
我知道切换频道肯定能解决这个问题，但我很好奇这个问题的根本原因。下面的截图来自我的另一台运行 Ubuntu 19.10 的笔记本电脑。它也没有显示使用频道 149，iwlist channel但你可以看到它仍然连接到该 APCurrent Frequency:5.745 GHz
更新＃2
我的国家（巴基斯坦，PK）仅允许 149、153、157、161 和 165 5GHz 频道（参考：Reddit）
我尝试过以下渠道：
- 36（手机上未显示，但笔记本电脑上可用）
- 60（笔记本电脑和手机均不显示）
- 140（笔记本电脑和手机均不显示）
因此，我最好的选择是让它与之前工作的频道 149 一起工作，或者选择其他可以与我的所有设备一起工作的非 DFS/TPC 频道。我不想因为改变国家而违反任何法律。
更新＃3
尽管我没有对 AP 和那台笔记本电脑进行任何更改，但具有频道 149 的相同 AP 现在在那台笔记本电脑上运行良好。
完整网络信息：https://paste.ubuntu.com/p/FBVrnryx6v/
请注意，iw reg get结果现在不同了。为什么会这样？现在是country US: DFS-FCC。以前是country 00: DFS-UNSET
##### iw reg get ########################
Region: Asia/Karachi (based on set time zone)
global
country US: DFS-FCC
(2402 - 2472 @ 40), (N/A, 30), (N/A)
(5170 - 5250 @ 80), (N/A, 23), (N/A), AUTO-BW
(5250 - 5330 @ 80), (N/A, 23), (0 ms), DFS, AUTO-BW
(5490 - 5730 @ 160), (N/A, 23), (0 ms), DFS
(5735 - 5835 @ 80), (N/A, 30), (N/A)
(57240 - 63720 @ 2160), (N/A, 40), (N/A)
##### iwlist channels ###################
lo no frequency information.
enp1s0 no frequency information.
wlp2s0 32 channels in total; available frequencies :
Channel 01 : 2.412 GHz
Channel 02 : 2.417 GHz
Channel 03 : 2.422 GHz
Channel 04 : 2.427 GHz
Channel 05 : 2.432 GHz
Channel 06 : 2.437 GHz
Channel 07 : 2.442 GHz
Channel 08 : 2.447 GHz
Channel 09 : 2.452 GHz
Channel 10 : 2.457 GHz
Channel 11 : 2.462 GHz
Channel 36 : 5.18 GHz
Channel 40 : 5.2 GHz
Channel 44 : 5.22 GHz
Channel 48 : 5.24 GHz
Channel 52 : 5.26 GHz
Channel 56 : 5.28 GHz
Channel 60 : 5.3 GHz
Channel 64 : 5.32 GHz
Channel 100 : 5.5 GHz
Channel 104 : 5.52 GHz
Channel 108 : 5.54 GHz
Channel 112 : 5.56 GHz
Channel 116 : 5.58 GHz
Channel 120 : 5.6 GHz
Channel 124 : 5.62 GHz
Channel 128 : 5.64 GHz
Channel 132 : 5.66 GHz
Channel 136 : 5.68 GHz
Channel 140 : 5.7 GHz
Channel 144 : 5.72 GHz
Channel 149 : 5.745 GHz
Current Frequency=5.745 GHz (Channel 149)
答案1
我研究发现，这个问题与监管领域的变化有关，尽管我不确定它是如何发生的。
有一个无线监管数据库（CRDA 使用）有特定国家规则。
它country US: DFS-FCC在 149 频道 @ 80Mhz 下工作正常。
country 00: DFS-UNSET当我遇到此问题时，不知何故，它在中午变为。第二天它再次设置为country US: DFS-FCC，并且 WiFi 再次开始工作。
有关无线监管基础设施的更多信息：https://wireless.wiki.kernel.org/en/developers/regulatory