huanju一台dell机器Ubuntu wifi 故障留档
非常神奇的一台机器，先说结果，放弃该机器了，让另一台机器顶上去。
故障表现：
1 在经过一路颠簸后，wifi一开，不管连没连上，屏幕都疯狂输出报错信息
[11376.275959] pcieport 0000:00:1c.7: AER: Corrected error received: id=00e7
[11376.275968] pcieport 0000:00:1c.7: PCIe Bus Error: severity=Corrected, type=Physical Layer, id=00e7(Receiver ID)
[11376.275981] pcieport 0000:00:1c.7: device [8086:a117] error status/mask=00000001/00002000
[11376.275990] pcieport 0000:00:1c.7: [ 0] Receiver Error (First)
[解决方法是把wifi 无线网卡按一按，按结实，有条件拿螺丝刀把网卡那的螺丝上紧一些。机箱也上紧一些。
问题解决
2 无法连上公司wifi网络。
可以连家里的wifi，可以连手机的“个人热点”，可以连公司windows主机的“热点”，就是连不上公司wifi。
同样的wifi无线网卡，装windows就可以连公司wifi。
使用iwlist scanning查看wifi信号，发现公司网络信号强度低，手机热点信号较高。手机拿开4-5米，可以看到信号衰减，但还是可以连上手机热点。
查看到的信息：
(base) eln@huanju:/etc/netplan$ iwlist scanning
wlp3s0 Scan completed :
Cell 01 - Address: 48:5F:08:9E:34:45
Channel:6
Frequency:2.437 GHz (Channel 6)
Quality=59/70 Signal level=-51 dBm
Encryption key:on
ESSID:"huanjupharma"
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=000000b3cab1266d
Extra: Last beacon: 18680ms ago
IE: Unknown: 000C6875616E6A75706861726D61
IE: Unknown: 010882848B960C121824
IE: Unknown: 030106
IE: Unknown: 2A0104
IE: Unknown: 32043048606C
IE: Unknown: 2D1AEE1117FFFF000000000000000000000000000000000000000000
IE: Unknown: 3D1606070700000000000000000000000000000000000000
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
IE: Unknown: 7F080000080000000000
IE: Unknown: DD180050F2020101000003A4000027A4000042435E0062322F00
IE: Unknown: 23021300
IE: Unknown: 4605F200010000
IE: Unknown: 4A0E14000A002C01C800140005001900
IE: Unknown: 0706434E20010D1E
IE: Unknown: DD12000AEB000001103009010000000000000000
IE: Unknown: DD07000C4303000000
Cell 02 - Address: 48:5F:08:9E:34:4A
Channel:153
Frequency:5.765 GHz
Quality=56/70 Signal level=-54 dBm
Encryption key:on
ESSID:"huanjupharma"
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=000000b3caa71be8
Extra: Last beacon: 18052ms ago
IE: Unknown: 000C6875616E6A75706861726D61
IE: Unknown: 01080C1218243048606C
IE: Unknown: 030199
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
IE: Unknown: 2D1AEF1117FFFF000000000000000000000000000000001804870900
IE: Unknown: 3D1699070600000000000000000000000000000000000000
IE: Unknown: 7F080000080000000040
IE: Unknown: DD180050F2020101000003A4000027A4000042435E0062322F00
IE: Unknown: 4605F200010000
IE: Unknown: 3304802A3A9B
IE: Unknown: 200103
IE: Unknown: 23023F00
IE: Unknown: C304027E7E7E
IE: Unknown: 070A434E2024042395052300
IE: Unknown: BF0CB179C933FAFF0C03FAFF0C03
IE: Unknown: C005019B00FAFF
IE: Unknown: DD07000C4303000000
IE: Unknown: DD21000CE700000000BF0CB101C0332AFF92042AFF9204C0050000002AFFC303010202
IE: Unknown: DD12000AEB000001103009010000000000000000
Cell 03 - Address: F6:84:8D:28:44:6E
Channel:6
Frequency:2.437 GHz (Channel 6)
Quality=30/70 Signal level=-80 dBm
Encryption key:on
ESSID:""
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 9 Mb/s
18 Mb/s; 36 Mb/s; 54 Mb/s
Bit Rates:6 Mb/s; 12 Mb/s; 24 Mb/s; 48 Mb/s
Mode:Master
Extra:tsf=000000160f779192
Extra: Last beacon: 18724ms ago
IE: Unknown: 0000
IE: Unknown: 010882848B961224486C
IE: Unknown: 030106
IE: Unknown: 050400010000
IE: Unknown: 0706434E20010D23
IE: Unknown: 330A08010203040506070809
IE: Unknown: 2A0104
IE: Unknown: 32040C183060
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
IE: Unknown: 2D1AEF1117FFFFFF0000000000000000000000000000000000000000
IE: Unknown: 3D1606070400000000000000000000000000000000000000
IE: Unknown: 4A0E14000A002C01C800140005001900
IE: Unknown: BF0CB101C033EAFF9204EAFF9204
IE: Unknown: C005000000EAFF
IE: Unknown: DD180050F2020101000003A4000027A4000042435E0062322F00
IE: Unknown: DD07000C4309000000
IE: Unknown: DD21000CE708000000BF0CB101C0332AFF92042AFF9204C0050000002AFFC303010202
IE: Unknown: DD49000AEB00000110101F01010000010000F4848D18446EFFFFF4848D18446E03005248595A7263614D20160206F6848D28446E9DF6848D58446E00000000000000030701F4848D18446E
Cell 04 - Address: 76:97:79:D5:2F:AA
Channel:153
Frequency:5.765 GHz
Quality=38/70 Signal level=-72 dBm
Encryption key:on
ESSID:"DIRECT-aa-HP M208 LaserJet"
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=000000b3ca91cf85
Extra: Last beacon: 18052ms ago
IE: Unknown: 001A4449524543542D61612D4850204D323038204C617365724A6574
IE: Unknown: 01080C1218243048606C
IE: Unknown: 2D1A0C1103FF00000000000000000000000000000000000000000000
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : CCMP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : PSK
IE: Unknown: 3D1699080000000000000000000000000000000000000000
IE: Unknown: 7F080500800000000000
IE: Unknown: 3B130301020304050C161718191A1B1C1D1E1F2021
IE: Unknown: DD180050F202010100000253380127A4000042435E0062322F00
IE: Unknown: DDA50050F204104A000110104400010210570001011041000100103B00010010470010962408FE1A5C4461B5129AEE0E4DE92E102100024850102300164850204C617365724A6574204D3230372D4D3231320010240007364757363441001042000B434E4846363036303034001054000800030050F20400051011001A4449524543542D61612D4850204D323038204C617365724A65741008000221081049000600372A000120
IE: Unknown: DD6A08000900040000003F0102010602010003164850204C617365724A6574204D3230372D4D32313200040736475736344100050B434E4846363036303034000610962408FE1A5C4461B5129AEE0E4DE92E0704C0A801160802007A090200180A04000000010B0400000000
enp2s0 Interface doesn't support scanning.
lo Interface doesn't support scanning.
能连上手机时的信号
(base) eln@huanju:/etc/netplan$ iwlist scanning
wlp3s0 Scan completed :
Cell 01 - Address: 92:7D:E4:AC:86:7B
Channel:6
Frequency:2.437 GHz (Channel 6)
Quality=70/70 Signal level=-40 dBm
Encryption key:on
ESSID:"showmemoney"
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=00000000010fe4e0
Extra: Last beacon: 49984ms ago
IE: Unknown: 000B73686F776D656D6F6E6579
IE: Unknown: 01088C129824B048606C
IE: Unknown: 030106
IE: Unknown: 050400020000
IE: Unknown: 0706434E20010D1B
IE: Unknown: 2A0100
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : CCMP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : PSK
IE: Unknown: DD180050F2020101000003A4000027A4000042435E0062322F00
IE: Unknown: 0B050100000000
IE: Unknown: 2D1A2D0117FF00000000000000000000000100000000000004000000
IE: Unknown: 3D1606080400000000000000000000000000000000000000
IE: Unknown: 7F080000000000000000
IE: Unknown: BF0C12318003FEFF5600FEFF5600
IE: Unknown: C005000000FEFF
enp2s0 Interface doesn't support scanning.
windows pc热点的信号：
wlp3s0 Scan completed :
Cell 01 - Address: D2:57:7B:CC:C8:5B
Channel:153
Frequency:5.765 GHz
Quality=42/70 Signal level=-68 dBm
Encryption key:on
ESSID:"showmemoney"
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=0000000000575882
Extra: Last beacon: 142708ms ago
IE: Unknown: 000B73686F776D656D6F6E6579
IE: Unknown: 01088C129824B048606C
IE: Unknown: 050402030000
IE: Unknown: 070658585899010F
IE: Unknown: 2D1AE70917FFFF000000000000000000000000000000000000000000
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : CCMP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : PSK
IE: Unknown: 3B0180
IE: Unknown: 3D16990F0300000000000000000000000000000000000000
IE: Unknown: 7F080400800000000060
IE: Unknown: BF0CB1798103FAFF0000FAFF0000
IE: Unknown: C005019B00FAFF
IE: Unknown: DD180050F2020101000003A4000027A4000042435E0062322F00
IE: Unknown: DD810050F204104A0001101044000102103B0001001047001099E78764D93F421B8F28009C8A1526C9102100094D6963726F736F66741023000757696E646F77731024000A31302E302E313930343310420001301054000800010050F20000001011000F4D4D2D3230323331313133323234341008000211681049000600372A000120
IE: Unknown: DD080050F21102000000
IE: Unknown: DD0E0050F2122B000600D0577BCCC85B
IE: Unknown: DD0B0017350101000000000000
(base) eln
从信号对比上，除了看到公司wifi信号强度较低，其它跟热点的也没看出来不同。
所以，最终放弃，准备使用另外一台非dell机器，或者换一个外接的usb无线网卡试试。