Ubuntu – Problem with TP-Link TL-WN823N

16.04usbwireless

Recently I installed Ubuntu 16.04 but cant get the usb wifi adapter to work properly , can anyone help me?

When wifi adpater is plugged , the lsusb output:

Bus 001 Device 003: ID 2357:0109
Bus 001 Device 002: ID 0e0f:000b VMware, Inc. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub 
Bus 002 Device 004: ID 0e0f:0008 VMware, Inc. 
Bus 002 Device 003: ID 0e0f:0002 VMware, Inc. Virtual USB Hub
Bus 002 Device 002: ID 0e0f:0003 VMware, Inc. Virtual Mouse
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

When wifi adapter is unplugged , the lsusb output:

Bus 001 Device 002: ID 0e0f:000b VMware, Inc. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 004: ID 0e0f:0008 VMware, Inc. 
Bus 002 Device 003: ID 0e0f:0002 VMware, Inc. Virtual USB Hub
Bus 002 Device 002: ID 0e0f:0003 VMware, Inc. Virtual Mouse
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub

Best Answer

I was going through the same problem. Here is how to solve it, even though it doesn't solve the nameless problem:

If you have wired internet available to your problem PC

Follow this answer, which adds Pilot6's rtlwifi PPA to your sistem and installs the required rtl8192eu-dkms package.

If you have no internet access in your computer

Find another computer with internet access to download the rtl8192eu-dkms package manually.
Access https://launchpad.net/~hanipouspilot/+archive/ubuntu/rtlwifi
Click on "View package details"
Filter your Ubuntu codename (16.04 LTS is Xenial).
Click on the triangle to open more options of "rtl8192eu-dkms - 4.4"
Download rtl8192eu-dkms_4.4_all.deb.
Transfer this file to your target PC
Install the file on your target PC, either through the Software Center or the Terminal (by issuing dpkg -i <filename> in the appropriate folder).
Re-plug your dongle.

Here's a screenshot to better show the location of the download link:

Source of image: https://launchpad.net/~hanipouspilot/+archive/ubuntu/rtlwifi/+packages?field.name_filter=&field.status_filter=published&field.series_filter=xenial

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Ubuntu – Set webcam on different USB bus

The answer is: it's not actually your problem.

Some logitech cameras have usb bandwidth allocation bug. Lets see if that's the case.

cat /sys/kernel/debug/usb/devices | grep "B: "

will give you current bandwidth allocation of all usb hubs, output will be something like this:

B:  Alloc=  0/900 us ( 0%), #Int=  0, #Iso=  0
B:  Alloc=  0/900 us ( 0%), #Int=  0, #Iso=  0
B:  Alloc=  0/900 us ( 0%), #Int=  0, #Iso=  0
B:  Alloc= 35/900 us ( 4%), #Int=  3, #Iso=  0
B:  Alloc=  0/900 us ( 0%), #Int=  0, #Iso=  0
B:  Alloc=  0/800 us ( 0%), #Int=  0, #Iso=  0
B:  Alloc=  0/800 us ( 0%), #Int=  0, #Iso=  0

As you can see, I currently have 35 mbps allocated of my usb3 hub. The problem with some logitech cameras, though, is that they will always allocate as much as they can get (480 mbps), disregarding of mode. And so it's down to simple arithmetic as 480 + 480 > 900 and second camera just "won't fit".

As long as your cameras are plugged in the same hardware usb hub, you will have that problem.

Also bear in mind, that webcamera usually allocates 128mbps in MJPEG and 424mbps in uncompressed mode for 640x480.

Best Answer

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