On Thursday 12 October 2006 10:54 pm, Kaburlasos, Nikos wrote: > Does anyone know whether the linux USB drivers support the suspend > feature on idle USB ports (i.e. the port has been idle for sometime and > so the driver transitions it in to a low-power 'suspend' state) while > the system is active and in S0 state?
It's being worked on now; called "autosuspend". If you're a hardware guy, maybe you can help by providing measurements of how much system power is being saved ... most of us are software guys, although in a few cases we'd appreciate a few logic analysers to help sort out some software issues. :) Clearly for devices that are pure slaves (e.g. mass storage) there's nothing very complicated involved ... once all the device's interface drivers are suspended, the USB link itself can suspend. The tricky bits come when active devices -- like active network adapters, mice, keyboards -- need USB remote wakeup to force links out of the USB suspend state. - Dave ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
