On Tue, Mar 27, 2012 at 10:17:16AM -0400, Paul Fox wrote: > huh. okay, well, 1.75 is the first of the XO models that has the > ability to leave the USB ports powered (and i assume they all do when > the mobile dongle is used - the hardware control is all or none). i > guess that driver is talking to the USB stack somehow to accomplish > this.
interesting. that might mean we could provide USB mouse wakeup support on XO-1.75 by tweaking the kernel. > next question: is this the right behavior? if the dongle weren't > power cycled during resume, i guess that might be a good thing? it is a radio and controller that associates with a radio network as soon as it is powered. this association requires a bit of time, of the order of a few seconds, and some transmissions at various power levels. once associated there's an occasional brief transmission to keep the radio network informed; a kind of keep-alive. the HSPA term for the association is "attached". establishing an IP connection is a separate step. so a power cycle increases the time taken to establish a connection, and possibly increases the total power consumed. on the other hand, this has to be balanced against the power consumed while the laptop is in suspend. the effect of a depowering on the radio network is negative but minor. an identity slot for the device is held available until the keep-alive is not answered. -- James Cameron http://quozl.linux.org.au/ _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel