ubuntu 16.04 重启主机后，无线网卡需插拔后才可以使用===原文中无法回复提交，只能新开了，@vickyc大神

[zoldean]

再描述详细些
(1) 关机状态下冷启动能不能用 === 可以用，但是一段时间之后会掉
(2) 开机状态下重新启动计算机（热启动）能不能用 === 不能用
(3) 不能用是怎样的状态，如何不能用 ==== 能搜到WiFi点，但是无法连接上去
(4) 在“不能用”的情况下，执行以下指令将结果全部复制贴上来
代码:
lsusb
lsusb -t
lsmod | grep 8192
sudo dmesg | grep 8192
sudo iwconfig


lsusb:
root@work-PC:~# lsusb
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 002: ID 0bda:818b Realtek Semiconductor Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 003: ID 03f0:0324 Hewlett-Packard SK-2885 keyboard
Bus 004 Device 002: ID 046d:c014 Logitech, Inc. Corded Workstation Mouse
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
root@work-PC:~#
root@work-PC:~#

lsusb -t:
root@work-PC:~# lsusb -t
/: Bus 08.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/: Bus 07.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/: Bus 06.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/: Bus 05.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
|__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
|__ Port 2: Dev 3, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/6p, 480M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/6p, 480M
|__ Port 2: Dev 2, If 0, Class=Vendor Specific Class, Driver=rtl8xxxu, 480M
root@work-PC:~#
root@work-PC:~#

lsmod | grep 8192:
root@work-PC:~# lsmod | grep 8192
snd_hda_core 81920 4 snd_hda_intel,snd_hda_codec,snd_hda_codec_generic,snd_hda_codec_realtek


sudo dmesg | grep 8192:
root@work-PC:~# sudo dmesg | grep 8192
[ 0.000000] setup_percpu: NR_CPUS:8192 nr_cpumask_bits:4 nr_cpu_ids:4 nr_node_ids:1
[ 0.000000] percpu: Embedded 36 pages/cpu @ffffa0f0bb600000 s107992 r8192 d31272 u524288
[ 0.000000] pcpu-alloc: s107992 r8192 d31272 u524288 alloc=1*2097152
[ 0.000000] RCU restricting CPUs from NR_CPUS=8192 to nr_cpu_ids=4.
[ 12.031268] usb 1-2: rtl8192eu_parse_efuse: dumping efuse (0x200 bytes):
[ 12.031371] usb 1-2: RTL8192EU rev B (SMIC) 2T2R, TX queues 3, WiFi=1, BT=0, GPS=0, HI PA=0
[ 12.031373] usb 1-2: RTL8192EU MAC: 30:b4:9e:84:1f:28
[ 12.031375] usb 1-2: rtl8xxxu: Loading firmware rtlwifi/rtl8192eu_nic.bin
root@work-PC:~#
root@work-PC:~#

sudo iwconfig:
root@work-PC:~# sudo iwconfig
enp0s25 no wireless extensions.

lo no wireless extensions.

wlx30b49e841f28 IEEE 802.11 ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm
Retry short limit:7 RTS thr=2347 B Fragment thr:off
Encryption key:off
Power Management:off

root@work-PC:~#
root@work-PC:~#

[vickycq]

===原文中无法回复提交，只能新开了，

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