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USB hotplugging — The Linux Kernel documentation
https://www.kernel.org/doc/html/latest/driver-api/usb/hotplug.html
The USB subsystem currently invokes /sbin/hotplug when USB devices are added or removed from system. The invocation is done by the kernel hub workqueue [hub_wq], or else as part of root hub initialization (done by init, modprobe, kapmd, etc). Its single command line parameter is the string “usb”, and it passes these environment variables:
USB hotplugging — The Linux Kernel documentation
https://www.kernel.org/doc/html/v4.13/driver-api/usb/hotplug.html
The USB subsystem currently invokes /sbin/hotplug when USB devices are added or removed from system. The invocation is done by the kernel hub workqueue [hub_wq], or else as part of root hub initialization (done by init, modprobe, kapmd, etc). Its single command line parameter is the string “usb”, and it passes these environment variables:
Hot Plug | Linux Journal
https://www.linuxjournal.com/article/5604
USB devices call /sbin/hotplug with the following arguments: argv [0] = hotplug_path argv [1] = "usb" argv [2] = 0 and the system environment is set to the following: HOME=/ PATH=/sbin:/bin:/usr/sbin:/usr/bin ACTION=action PRODUCT=idVendor/idProduct/bcdDevice TYPE=device_class/device_subclass/device_protocol
hotplugging - Automating hotplug events for USB in Linux ...
https://stackoverflow.com/questions/11882495/automating-hotplug-events-for-usb-in-linux
Make sure you have your hotplug script path in /proc/sys/kernel/hotplugfile: echo /path/to/hotplug/script > /proc/sys/kernel/hotplug. The default path is /sbin/hotplug. If you are using bash script for debbuging hotplug like this. #!/bin/bashenv >> /your/log/file. make sure you have specified an absolute path of /your/log/fileand the script is executable (just run it by hand …
[SOLVED] how to hotplug usb audio card ... - Arch Linux
https://bbs.archlinux.org/viewtopic.php?id=192281
and i add module switch-on-connect before the udev-detect's "if" conditional block. restart the computer with the usb sound card unpluged. play some music in VLC with the inner sound card (intel) to check if it's still working good, and it is. then i pluged in the usb sound card, and the sound from the inner sound card stoped.
[SOLVED] USB audio card hotplug behavior is ... - Arch Linux
https://bbs.archlinux.org/viewtopic.php?id=212593
Linux tuber.kray.ca 4.5.4-1-ARCH #1 SMP PREEMPT Wed May 11 22:21:28 CEST 2016 x86_64 GNU/Linux. ... USB audio card hotplug behavior is... very strange. what the heck. ok, so looking around at other posts online here, i found some other people who were having generally weird USB behavior as well ...
Linux Kernel Configuration - Devices
https://www.linuxtopia.org/online_books/linux_kernel/kernel_configuration/ch09s02.html
Linux supports many different types of USB devices. To enable USB support, you must first enable support for a USB controller, which drives the USB connection on the machine. To determine if your machine has a USB controller, and which type it is, run the following command:
Hot-Plugging USB Devices (System Administration Guide ...
https://docs.oracle.com/cd/E19683-01/806-4073/6jd67r9ea/index.html
When you hot-plug a USB device, the device is immediately seen in the system's device hierarchy, as displayed in the prtconf command output. When you remove a USB device, the device is removed from the system's device hierarchy, unless the device is in use. If the USB device is in use when it is removed, the hot-plug behavior is a little different.
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