If a system is booted without the reconfiguration option and no USB keyboard or mouse is connected, USB drivers are not automatically attached. The system will not recognize hot-plugged USB devices.
Workaround: To make the system recognize hot-plugged USB devices, choose one of the following workarounds.
Add the following line to /etc/system and reboot the system.
forceload:drv/ohci |
Type the following on a command line.
# devfsadm -i ohci |
For more information see devfsadm(1M).
If you hot-unplug a USB audio device the links to /dev/audio are broken. As a result, some audio applications might not recognize audio devices, including on-board audio. Rebooting the system or hot-plugging the USB audio device has no effect.
Workaround: Perform the following steps after a USB audio device is hot-unplugged.
Become superuser.
Correct the broken links by typing the following on a command line.
# rm /dev/audio* # /usr/sbin/devfsadm -c audio |
For more information see devfsadm(1M).
Third-party USB speakers might not produce sound after the USB driver is attached. Increasing the speaker volume or hot-plugging the device might not have any effect.
Workaround: Powercycle the USB speakers.