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Runtime Powermanagement
From Gentoo Wiki (test)
Linux can power down unused devices and wake them up on demand.
Configuration
Enforce for every device:
FILE
/etc/udev/rules.d/60-runtime-powermanagement.rulesSUBSYSTEM!="pci", GOTO="power_runtime_rules_end"
ACTION!="add", GOTO="power_runtime_rules_end"
KERNEL=="????:??:??.?" #, WAIT_FOR_SYSFS="bInterfaceProtocol"
PROGRAM="/bin/sleep 0.1"
ATTR{power/control}=="*", ATTR{power/control}="auto"
LABEL="power_runtime_rules_end"