老dell笔记本装的ubuntu18.04，无线网卡只能搜到部分网络。。

[ww2000e]

自己家的无线网总是搜索不到。。。
网卡是 Network controller: Broadcom Limited BCM4312 802.11b/g LP-PHY (rev 01)
能搜到一部分网络，自己家的wifi总是搜索不到。。

[poloshiao]

1. 用 firefox 打開
http://paste.ubuntu.com
會出現空白 content 框

2. 把下面指令 複製 貼進終端機 執行
把下面指令 複製 貼進終端機 執行
2-0. uname -a
2-1. sudo lspci -knn | grep -A5 Wireless
2-2. sudo lshw -numeric -class network
2-3. sudo ip addr show
2-4. sudo ip route show
2-5. sudo rfkill list all
2-6. sudo nmcli dev status
2-7. sudo dhclient -v
2-8. sudo iwlist scan
把你的 ESSID 那一段落 直接 選取/複製 貼上來
2-9. sudo ls -al /etc/resolv.conf
2-10. sudo cat /run/resolvconf/resolv.conf
2-11. sudo dkms status
2-12. sudo ping -c 3 forum.ubuntu.org.cn

3. 把上述指令及執行結果 全部直接 選取/複製 貼進去 content 框內
然後按下 paste
會回應 http://paste.ubuntu.com/xxxxxxx # xxxxxxx 是一組數字
把 http://paste.ubuntu.com/xxxxxxx 貼上來

[ww2000e]

uname -a
Linux E5400 4.15.0-10-generic #11-Ubuntu SMP Tue Feb 13 18:23:35 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

sudo lspci -knn | grep -A5 Wireless
Subsystem: Dell Wireless 1397 WLAN Mini-Card [1028:000c]
Kernel driver in use: wl
Kernel modules: wl

sudo lshw -numeric -class network
*-network
description: Wireless interface
product: BCM4312 802.11b/g LP-PHY [14E4:4315]
vendor: Broadcom Limited [14E4]
physical id: 0
bus info: pci@0000:0c:00.0
logical name: wlp12s0
version: 01
serial: 00:26:5e:44:4b:d0
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=wl0 driverversion=6.30.223.271 (r587334) latency=0 multicast=yes wireless=IEEE 802.11
resources: irq:17 memory:f69fc000-f69fffff
*-network
description: Ethernet interface
product: NetXtreme BCM5761e Gigabit Ethernet PCIe [14E4:1680]
vendor: Broadcom Limited [14E4]
physical id: 0
bus info: pci@0000:09:00.0
logical name: enp9s0
version: 10
serial: 00:25:64:41:aa:40
size: 100Mbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm vpd msi pciexpress bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=tg3 driverversion=3.137 duplex=full firmware=5761e-v3.60 ip=192.168.1.107 latency=0 link=yes multicast=yes port=twisted pair speed=100Mbit/s
resources: irq:25 memory:f68e0000-f68effff memory:f68f0000-f68fffff


sudo ip addr show

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp9s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 00:25:64:41:aa:40 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.107/24 brd 192.168.1.255 scope global dynamic noprefixroute enp9s0
valid_lft 85625sec preferred_lft 85625sec
inet6 fe80::a5c9:8d72:bf7c:6bdc/64 scope link noprefixroute
valid_lft forever preferred_lft forever
3: wlp12s0: <NO-CARRIER,BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state DORMANT group default qlen 1000
link/ether 00:26:5e:44:4b:d0 brd ff:ff:ff:ff:ff:ff



sudo ip route show
default via 192.168.1.1 dev enp9s0 proto dhcp metric 100
169.254.0.0/16 dev enp9s0 scope link metric 1000
192.168.1.0/24 dev enp9s0 proto kernel scope link src 192.168.1.107 metric 100





sudo rfkill list all

0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
1: brcmwl-0: Wireless LAN
Soft blocked: no
Hard blocked: no
2: dell-wifi: Wireless LAN
Soft blocked: no
Hard blocked: no





sudo nmcli dev status
DEVICE TYPE STATE CONNECTION
enp9s0 ethernet 已连接 有线连接 1
wlp12s0 wifi 已断开 --
lo loopback 未托管 --




sudo dhclient -v
Internet Systems Consortium DHCP Client 4.3.5
Copyright 2004-2016 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/wlp12s0/00:26:5e:44:4b:d0
Sending on LPF/wlp12s0/00:26:5e:44:4b:d0
Listening on LPF/enp9s0/00:25:64:41:aa:40
Sending on LPF/enp9s0/00:25:64:41:aa:40
Sending on Socket/fallback
DHCPDISCOVER on wlp12s0 to 255.255.255.255 port 67 interval 3 (xid=0x66a28543)
DHCPREQUEST of 192.168.1.104 on enp9s0 to 255.255.255.255 port 67 (xid=0x61936eb5)
DHCPACK of 192.168.1.104 from 192.168.1.1
RTNETLINK answers: File exists
bound to 192.168.1.104 -- renewal in 37026 seconds.



sudo iwlist scan
没有我家的无线网，之前ubuntu16.04,ubuntu17.10均可搜到连接上


sudo dkms status
bcmwl, 6.30.223.271+bdcom, 4.15.0-10-generic, x86_64: installed

[poloshiao]

sudo nmcli dev status
DEVICE TYPE STATE CONNECTION
enp9s0 ethernet 已连接 有线连接 1
wlp12s0 wifi 已断开 --

1. 表示 有線網卡界面 enp9s0 及 無線網卡界面 wlp12s0 均由 network-manager 管理
1-1. 預設 同一時間 enp9s0 及 wlp12s0 只能有一個啟用 另一個啟用後自動斷線待命中

2: enp9s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
link/ether 00:25:64:41:aa:40 brd ff:ff:ff:ff:ff:ff
inet 192.168.1.107/24 brd 192.168.1.255 scope global dynamic noprefixroute enp9s0
valid_lft 85625sec preferred_lft 85625sec
inet6 fe80::a5c9:8d72:bf7c:6bdc/64 scope link noprefixroute
valid_lft forever preferred_lft forever
3: wlp12s0: <NO-CARRIER,BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state DORMANT group default qlen 1000
link/ether 00:26:5e:44:4b:d0 brd ff:ff:ff:ff:ff:ff

2. 目前是 enp9s0 啟用中 而 wlp12s0 待命中
2-1. 如果 enp9s0 突然斷線 wlp12s0 會無感自動啟用 使用者 幾乎沒有感覺其中的連線轉換
2-2. 反之 亦然

sudo iwlist scan
没有我家的无线网，之前ubuntu16.04,ubuntu17.10均可搜到连接上

3. 測試期間 暫時先把有線網卡硬件 從 Bios 關掉 只留 無線網卡硬件 再重開機 試試

4. 還有問題 歡迎再貼文

[ww2000e]

我给无线网的ssid从wz改成wzaa，就可以搜索到了，难道18.04的wifi管理工具不支持2个以内字符的ssid？




Cell 01 - Address: D0:C7:C0:CF:36:DE [333/350]
Channel:1
Frequency:2.412 GHz (Channel 1)
Quality=70/70 Signal level=-29 dBm
Encryption key:on
ESSID:"wzaa"
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=0000000000000000
Extra: Last beacon: 92ms ago
IE: Unknown: 0004777A6161
IE: Unknown: 010882848B961224486C
IE: Unknown: 030101
IE: Unknown: 2A0104
IE: Unknown: 32040C183060
IE: Unknown: 2D1AEE1117FFFF0000010000000000000000000000000
C0000000000
IE: Unknown: 3D1601000700000000000000000000000000000000000
000
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : TKIP CCMP
Authentication Suites (1) : PSK
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : TKIP CCMP
Authentication Suites (1) : PSK
IE: Unknown: DD180050F2020101000003A4000027A4000042435E006
2322F00
IE: Unknown: 4A0E14000A002C01C800140005001900
IE: Unknown: DD07000C4307000000
IE: Unknown: DD8B0050F204104A0001101044000102103B000103104
700102880288028801880A880D0C7C0CF36DE10210004464153541023000646575232303010240
003322E301042000C4430433743304346333644451054000800060050F20400011011001633303
04D20576972656C657373204E20526F75746572100800020086103C0001011049000600372A000
120

[poloshiao]

难道18.04的wifi管理工具不支持2个以内字符的ssid？

參考
1. https://www.velocityreviews.com/threads ... th.680505/
Is there a minimum length required for the SSID of a WLAN?
Answer: 1 character
2. https://www.reddit.com/r/networking/com ... d/chszeol/
Getting around character minimums for SSID
Answer: There is no minimum SSID length.

[ww2000e]

还是不行，关机重启后依然搜索不到，除非我给ssid改动下，就能搜到一次