PCI and USB power management in linux

gistfile1.txt

# If usb hdd is made sleeping using hdparm or unbind. The usb device still consumes about 1W. 
# This power consumtpion could be spared removing whole usb hub from pci bus 


# Make sleep using hdparm
##########################################
hdparm -y /dev/sdb

# Connect / disconnect usb device
###########################################
# list device
lsusb -t

# unbind device
echo '2-3' | sudo tee /sys/bus/usb/drivers/usb/unbind

# rebind device
echo '2-3' | sudo tee /sys/bus/usb/drivers/usb/bind


# remove/rescan pci device - whole usb hub
###########################################

# Sideeffect is that whole usb hub is sleeping

#list devices
lspci -t

#disable
echo 1 | sudo tee /sys/devices/pci0000\:00/0000\:00\:14.0/remove

# reenable
echo 1 | sudo tee /sys/bus/pci/devices/0000\:00\:00.0/rescan