> Subject: USB suspending > Date: Friday, 5 October 2007 14:54 > From: Lukas Hejtmanek <xhejtman@xxxxxxxxxxx> > To: "Rafael J. Wysocki" <rjw@xxxxxxx> > > Hello, > > I've noticed that while suspended in RAM USB ports are powered so any device > connected to the port gets power. Can I turn off power of all USBs ports while > suspending to RAM? Usually, no. On PCs, most root hubs don't support the relevant root hub "port power off" request. Also, their ACPI configurations are set up to expect port power to stay on. Of course, powering off the USB ports gives only minimal power savings. Suspended devices aren't permitted to draw much power, typically only 0.5 mA. - Dave _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
