Universal Serial Bus (USB) establishes a connection between devices and a host computer.

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29
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5answers
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How to reconnect a logically disconnected USB device?

It is possible for a USB storage device to become logically disconnected: the device is still plugged in, but is invisible from the operating system (e.g. it's not listed under /proc/bus/usb). Maybe ...
24
votes
3answers
23k views

Installing Grub 2 on a USB flash drive

MultiBootISOs is a tool that let you install Grub on a USB flash drive. I really like it because it lets me boot from ISO files and let me put a bunch of ISOs on my USB and choose which one to boot. ...
21
votes
1answer
14k views

How to assign USB driver to device

This question is two-fold: First, how do you manually detach a driver from a USB device and attach a different one? For example, I have a device that when connected automatically uses the ...
20
votes
2answers
20k views

How to run custom scripts upon USB device plug-in?

What is the state-of-the-art method for automatically executing custom scripts upon USB device plug-in under current Linux distributions like Debian/CentOS/Fedora? For example if you want to ...
19
votes
2answers
10k views

What happens when a USB drive is plugged in?

What is the flow of USB events from kernel space to user space? I get a popup on my desktop when I plug in a USB drive -- what is the sequence of events that leads from detecting the new USB drive to ...
15
votes
5answers
28k views

Why is USB not working in Linux when it works in UEFI/BIOS?

For background I have just built a new machine with modern hardware including: AMD FX-8350 Gigabyte GA-990FXA-UD3 motherboard 16GB RAM NVidia GTX 650 Ti Kingston SSD Given that, I tried to install ...
14
votes
1answer
14k views

How to use Linux kernel driver bind/unbind interface for USB-HID devices?

First background. I am developing a driver for Logitech game-panel devices. It's a keyboard with a screen on it. The driver is working nicely but by default the device is handled by HID. In order to ...
12
votes
4answers
5k views

If I connect a physical device, how can I ever know which device file belongs to it?

Say I plug in several USB drives which don't get automatically mounted. How can I find out which device file belongs to which physical device, so I can mount it for example? I'm running Mac OS X but ...
12
votes
3answers
14k views

How to disable USB autosuspend on kernel 3.7.10 or above?

I've updated my HTPC from kernel 3.7.10 to 3.10.7 and it seems CONFIG_USB_SUSPEND is now gone from the kernel options and included in PM. The main problem I'm facing is that I have an external HDD ...
11
votes
3answers
1k views

Is USB-to-USB data transfer between two Linux OSes possible?

I want to create a USB-to-USB data transfer system in Linux (preferably Ubuntu). For this I want to use no external hardware or switch (except this cable). It's going to be like mounting a USB drive ...
11
votes
3answers
5k views

Get power consumption of a USB device

Is there a way to check how much power a USB device requires? Why do I need this? I need to connect an LTE USB stick to my Raspberry pi, and don't know how much power it needs. We got it quite ...
11
votes
4answers
4k views

Serve files over USB

I would like to be able to serve a section of my box's file system over USB to another computer. For example, if the files are on box A and I am reading from box B, then B would mount A, see those ...
11
votes
2answers
10k views

How to re-mount a USB stick after unmounting from Nautilus without disconnecting it?

I find that in order to re-mount a USB stick, I have to physically disconnect it, and then re-connect it. How can I do this without such tiring physical action?
11
votes
2answers
233 views

Is there a way to mirror USB outputs?

I'm currently writing a program for a project. It is for a braille reading system where I have a braille display connected via USB that is controlled by a program called brltty. One of the ...
10
votes
4answers
44k views

How to install Debian from USB? (Using full size image not netinstall)

I learned of a way to install Debian from USB using the netinstall image, which is fine. However it means I have to spend hours and hours downloading packages to do the install. Is there a way I can ...
10
votes
1answer
7k views

Understand output of `udevadm info -a -n /dev/sdb`

I plug an external HDD into my laptop. I try to find out the information by $ udevadm info -a -n /dev/sdb Udevadm info starts with the device specified by the devpath and then walks up the chain of ...
9
votes
2answers
2k views

Is it possible for a daemon (i.e. background) process to look for key-presses from a USB keyboard?

I'm working on an embedded Linux project where I will be developing a program that will run automatically on bootup and interact with the user via a character display and some sort of button array. ...
9
votes
1answer
5k views

Creating a bootable Linux installation USB without unetbootin

I want to install Scientific Linux from USB. I don't know why unetbootin doesn't work but I am not curious to find out: after all, I transferred to Linux from Windows to see and learn the underlying ...
9
votes
6answers
23k views

Create a Bootable (UEF GRUB) USB for Ubuntu & Windows 7 Install

I want to create a Bootable EFI USB to install Ubuntu & Windows 7 (maybe with utilities like PartedMagic). I did that using MultiSystem previously. However, I am using GPT and Windows install ...
9
votes
4answers
1k views

GRUB on USB Drive — adding OSes

Some Background: Coming from a largely Windows background (though I'm familiar with Ubuntu, etc.) and using a Windows 7 machine to complete this task Have gotten GRUB installed successfully to the ...
9
votes
3answers
2k views

Fake serial number of USB device

I have a mobile phone connected to my PC via USB. When viewing the device info using sudo udevadm info --attribute-walk the product and vendor id's show up fine, but there is no ATTR{serial}. An ...
9
votes
1answer
20k views

Mounting USB drive that is not recognized

Using Arch Linux / XFCE, I frequently have problems with USB drives that are not properly mounted. Sometimes they automatically show up in Thunar and I can mount them with one click. However, at other ...
9
votes
3answers
7k views

Mount printers at /dev/usb and still use CUPS

Due to a new version of CUPS, I suddenly lost the direct path to my printers that was previously available under /dev/usb/lpXXX. I used this to print directly from the command line. echo "test" > ...
8
votes
3answers
2k views

How should I configure grub for booting linux kernel from a USB hard drive?

I have a laptop hard drive in an external enclosure which I use as a large pendrive. For an added twist, I have installed Linux on it, so I can boot any machine with my distribution of choice (e.g. ...
8
votes
5answers
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Why does “cat ttyUSB0” not produce output?

I connected an infrared receiver to a USB port ... (the last line of dmesg tells device file) $ dmesg [10496.596063] usb 7-2: new full-speed USB device number 2 using uhci_hcd [10496.751112] usb 7-2: ...
8
votes
1answer
663 views

USB audio only outputs white noise

I am running OpenBSD/i386 5.1 on a 5 year old laptop. The speakers and headphone port work, but the headphone port is a little loose so I am trying to install an external USB sound card (Fiio E17 USB ...
7
votes
2answers
3k views

How can I hide messages of udev?

When I plug in a usbhub (7 sticks in) udev displays a lot of messages in console. Can I hide these messages or send them to /dev/null?
7
votes
3answers
6k views

Is my USB 2.0 device running at full speed?

How can I tell if my USB flash drive is running at full USB 2.0 speed? Currently I'd just like to verify that the drive is plugged into a 480 Mbps port, but in the past I've been unsure if a given ...
7
votes
2answers
7k views

How to bind USB device under a static name?

I have an arduino which sometimes gets bound to /dev/ttyUSB0 and other times to /dev/ttyUSB1 making my script fail. I do not want to enumerate all the possibilities of where my device could be, but I ...
7
votes
1answer
6k views

How to get UUID for a USB drive?

I want to mount my USB to a mount point which holds the UUID name. But I don't know how to express this in a command line! Can someone help me how to do it? I have searched and found that I have to ...
7
votes
2answers
2k views

Attaching USB-Serial device with custom PID to ttyUSB0 on embedded

I'm attempting to get an FTDI USB-Serial device with a custom PID to automatically (or even manually) attach to ttyUSB%n, without much success. The device's normal VID/PID is 0403/6001. When ...
7
votes
3answers
7k views

Automount USB drives with no GUI requirement (halevt replacement)

For minimal installations of Debian, I have been using halevt to enable automounting of USB drives. Halevt is reliable and requires no configuration aside from installing the package. Now, halevt has ...
7
votes
2answers
2k views

Auto-run script when Wifi card is plugged in (udev)

I've been trying to use udev to make a Debian system run a bash script when a wireless card is connected. So far I created this file /etc/udev/rules.d/wifi-detect.rules: ACTION=="add", ...
6
votes
2answers
10k views

Which USB slot is 2.0 or 3.0? How do I know?

I would like to know if my desktop computer supports USB 3.0, but from the output below this seems unlikely. I get the following output from lspci: root@liv-HP-Compaq-dc7900:/home/liv# lspci -v | ...
6
votes
4answers
5k views

When installing linux on USB Drive, which filesystem should I use to format for best performance?

I'm planning on installing Linux on a USB drive, and I was wondering which filesystem I should use to format the drive for best performance (overall responsiveness), and life of the drive?
6
votes
1answer
1k views

What would cause “crossover” between two USB2 webcams when using motion?

I am using the Motion package for linux to act as a security system with two Microsoft LifeCam HD-5000 webcams. In general it's working very well but I'm experiencing a weird issue. Every now and then ...
6
votes
4answers
3k views

How can I switch to my USB headset automagically when it's plugged in?

I'm running Funtoo Linux, a Gentoo derivative. My two new Plantronics USB headsets (one wired, one wireless) work nicely. I plug one in, ALSA notices it, and if I manually set an application to use ...
6
votes
1answer
4k views

Turning off power to usb port. Or turn off power to entire usb subsystem

I have a usb lamp which I specifically bought in order to turn it off programmatically at a certain time, thus I need to remove the power to its usb port. I believe I have a usb-hub at usb6. The lamp ...
6
votes
1answer
4k views

Why doesn't this udev rule trigger upon removal of the device?

I have two mice, one which has an issue where the middle mouse button and button6 get triggered simultaneously. So I configured my ~/.Xmodmap to disable this button. At the same time, however, I ...
6
votes
1answer
764 views

USB 2.0 device is not working in USB 3.0 ports

I have a Ubuntu 12.04 system. On that system I have one USB 3.0 port. In this port I am trying use my USB 2.0 device, but every time when I plug in that USB 2.0 device into the USB 3.0 port, the ...
6
votes
2answers
2k views

udev rule for assigning known symlinks for identical usb serial devices

I have two (and possibly in the future, more) USB serial devices which are identical (down to the serial number, unfortunately) - they're actually BTC miners. Currently they end up as ttyUSBX where X ...
6
votes
2answers
2k views

Creating bootable usb stick with NetBSD installer on Linux

How can I create bootable usb stick with NetBSD installer on Linux? I tried to use UNetBootin, but on download list there is only 4.0 version and when I select my ISO with 5.1 version it doesn't work ...
6
votes
1answer
2k views

Support for usb 3.0?

I could not seem to find the question here but I was wondering what experience if any users have had with USB 3.0? My asus p5x58d has usb 3 on it but I have yet to try it out and also do not know ...
6
votes
1answer
25k views

Remove USB flash-drive write-protection

I have a sports-watch which has an integrated flash-memory. This flash-memory is used to store training information. When I connect the watch to my computer using the USB cable, it's detected as ...
6
votes
1answer
1k views

How to make a system lock when the USB pendrive with authentication key is removed?

Say, I have USB drive authentication up and working. So far, so hoopy. But now I want to take the next step, which is locking the machine when I eject the medium. I know there is udev I can script, ...
6
votes
1answer
1k views

“usb 3-2: can't set config #1, error -110” - USB keyboard works in Windows 8 laptop but on PC only until Linux boots

I tried 2 new USB keyboards that work until Linux starts booting. When booting I saw: [ 8.365211] usb 3-2: New USB device found, idVendor=1a2c, idProduct=0b23 [ 8.404863] usb 3-2: New USB ...
6
votes
2answers
2k views

Booting from install disk, no USB keyboard

I'm trying to install Arch Linux on a new system with a Gigabyte GA-Z87N-WIFI board. Although I can use the USB keyboard (and mouse) in the BIOS, the keyboard doesn't seem to work at all once I boot ...
6
votes
3answers
832 views

Detection of USB Modem is unstable - how can I correct this? [closed]

I am using Huawei 3G USB Modem in Ubuntu 12.04 LTS on DELL Inspiron NS5520. I tried every possible solution but had no luck. Whenever my USB Modem disconnects, I can not re-connect it and then I have ...
5
votes
3answers
714 views

How to get my USB key to auto mount

I'm currently working in a command line only environment. When I plug my USB key in, I see a new device file in /dev: ... sdi sdi1 ... If I simply sudo mount /dev/sdi1 /media/tmp, and umount it ...
5
votes
3answers
5k views

How to interpret the output of 'lsusb' — What are all these Linux Foundation root hubs?

I recently found out about the lsusb command while troubleshooting a headset issue.. My laptop runs debian and doesn't have anything plugged into USB currently, but when I run the "lsusb" command, I ...