>> I'm trying to get a USB sound card to behave in a certain way which >> requires it to think the computer has gone to sleep. I'm told the >> specific signal the sound card looks for is if the USB controller has >> been physically powered down. Should I unload a kernel module to >> accomplish this, or do I need to actually put the computer into sleep >> mode? > > I don't think you can turn USB port off, at best you can suspend it, > which is not truly 100% powered-down. I think you might be able to > power off an entire hub (and never power it back on again until > reboot) but I'm not sure if that will be any better than just > unplugging the cable. You might be able to build some kind of simple > USB on/off switch. :) > > Check out /sys/bus/usb/devices/[yourdevice]/power/level for current > status and you can echo different commands to that same file to > attempt to change its status. Check out the power management settings > and documentation in the linux kernel for your options.
Will do, thanks Paul. - Grant
