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Re: USB disconnect wakes machine

At 10:02 PM -0600 5/18/05, Fernando Urbina wrote:
Yes, this is expected behaviour. The unplug of a USB device generates a resume on the USB Bus, per the spec. That causes the machine to wake up. On MacOS 9 we had support for "partial wake",

There's a couple of issues here, one is that you really don't want a device to be unplugged and then a different device plugged in without the Mac knowing about it. That could lead to all sorts of confusions.

There's also the issue that plugging in a device really should wake up the Mac, its a user input and it would seem to imply that the user is wanting to do something. There's no way you can have the controller tell you about plugs, but not unplugs, it only has one status bit "something changed".

Partial wake was the OS 9 solution, if you unplug a device from a sleeping machine which supports partial wake, you'll see the sleep light "stutter", that's it waking up, and then immediately being told to go back to sleep. That relies on a lot of support from the rest of the OS, which is not in OS X yet.
--
Barry Twycross
email@hidden
---
USB, it's not a Dyslexic BUS. (Thanks to TC.)
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References: 
 >USB disconnect wakes machine (From: Rick Mann <email@hidden>)
 >Re: USB disconnect wakes machine (From: Fernando Urbina <email@hidden>)



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