I have plugged an LED strip into my Mac Mini through a USB port which in turn is fixed to the back of my monitor to provide a nice ambient light. Rather than powering off the machine, or unplugging the USB to switch the light off, I want the USB to power down when the Mac goes to sleep. I cannot see how this can be done.
Any ideas?
Stu
iMac Line (2012 and Later)
I do not either. That was a feature for some recent Macs for long "sleeps"
Standby Mode
For Mac computers that start up from an internal SSD, macOS includes a deep sleep mode known as Standby Mode.
Mac computers manufactured in 2013 or later enter standby after being in sleep mode for three hours. Earlier models enter standby after just over an hour of sleep. During standby, the state of your session is saved to flash storage (SSD). Then, the power turns off to some hardware systems such as RAM and USB buses.
Standby extends how long a notebook computer can stay asleep on battery power. A notebook with a fully charged battery can remain in standby for up to thirty days without being plugged in to power.
Powering off a USB port on sleep - Mac mini
