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mxa
Paper Tape
Posts: 3
Registered: ‎09-26-2018
Location: DE
Views: 286
Message 1 of 3

Where is USB Bus 001? (ThinkPad Edge E540, Linux)

I want to use a USB soundcard to it's maximum performance (on Linux). For this, I go the advice to use the soundcard on a USB bus which is't occupied by oder devices which might interfere with the data transmission causing drop outs in the audio.

 

looking at the usb system with lsusb gives me this list:

Bus 002 Device 002: ID 8087:8000 Intel Corp. 
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8008 Intel Corp. 
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 004: ID 17ef:304f Lenovo 
Bus 004 Device 003: ID 2109:0812 VIA Labs, Inc. VL812 Hub
Bus 004 Device 002: ID 2109:0812 VIA Labs, Inc. VL812 Hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 002: ID 8087:07dc Intel Corp. 
Bus 003 Device 064: ID 1686:0045 ZOOM Corporation H4 Digital Recorder
Bus 003 Device 072: ID 046a:b090 Cherry GmbH 
Bus 003 Device 075: ID 091e:2002 Garmin International 
Bus 003 Device 074: ID 05a3:9230 ARC International 
Bus 003 Device 073: ID 0424:4060 Standard Microsystems Corp. Ultra Fast Media Reader
Bus 003 Device 071: ID 0424:2640 Standard Microsystems Corp. USB 2.0 Hub
Bus 003 Device 070: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub
Bus 003 Device 006: ID 1a40:0101 Terminus Technology Inc. Hub
Bus 003 Device 012: ID 17ef:304e Lenovo 
Bus 003 Device 066: ID 22f0:0014  
Bus 003 Device 005: ID 2109:2812 VIA Labs, Inc. VL812 Hub
Bus 003 Device 004: ID 2109:2812 VIA Labs, Inc. VL812 Hub
Bus 003 Device 003: ID 0bda:5719 Realtek Semiconductor Corp. 
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

The line without any description is the soundcard, an Allen&Heath ZEDi8 mixer.

As you can see Bus 003 is pretty crowded, but Bus 001 only has a hub in it. I tried every USB port on the device and also the docking station, but no matter where I plug it in, all physical ports seem to be on Bus 003.
Where is the Bus 001 and is it possible to connect anything there?

I have a soldering iron Smiley Happy

Social Support Agent
Social Support Agent
Posts: 271
Registered: ‎08-02-2018
Location: US
Views: 243
Message 2 of 3

Re: Where is USB Bus 001? (ThinkPad Edge E540, Linux)

Hi mxa,

 

Welcome to the community forums.

 

I looked into the block diagram and I think this  Bus 001 is connected / dedicated to the other hardware components ( like Camera,Touch Panel) so it can communicate directly to the chipset. I wouldn’t recommend  tinkering with it hardware wise though, especially if it works plug and play without any issues.

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mxa
Paper Tape
Posts: 3
Registered: ‎09-26-2018
Location: DE
Views: 234
Message 3 of 3

Re: Where is USB Bus 001? (ThinkPad Edge E540, Linux)

Thank you for the diagram, that's informative, even though it isn't marked explicitely which ID the USB busses have.

I suspected USB 001 and 002 connect internal devices, but was curious because technically these internal devices should be listed with the lsusb command too. I disabled the fingerprint reader in the BIOS, so maybe this is why. Anyway, this gives me some leads. I bought the docking station (used for 30 eur) because I was hoping it will expose those empty busses, but was disappointed when I realized it also is just more ports on the same bus 003.

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