USB is an irritating protocol that requires USB controllers to remain active whenever a device is attached, even if that device is doing nothing. This consumes unnecessary power and can prevent the system going into deep idle states under some circumstances. The kernel supports USB autosuspend, which allows idle USB devices to be suspended and the upstream ports to power down. This is disabled by default because it breaks various pieces of hardware. Through F12 I'm going to be slowly enabling autosuspend on various pieces of USB hardware. The aim is to ensure that it's only enabled on hardware that supports it. This is going to be a combination of kernel modifications and packaging changes, and while I'll be testing as many as possible before uploading anything there's a risk that some hardware will misbehave. I'll let people know when I think I'm about to upload anything risky. The first part of this is an upload of libfprint which enables autosuspend on fingerprint readers. I'm expecting this to be pretty safe, but there's always the possibility that a couple of people will find problems. If your fingerprint reader suddenly stops working after this change, please file a bug and include the output of lsusb. -- Matthew Garrett | mjg59@xxxxxxxxxxxxx -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
