Subject: kern/37459: USB device issues on suspend/resume
To: None <,,>
From: None <>
List: netbsd-bugs
Date: 12/02/2007 01:40:00
>Number:         37459
>Category:       kern
>Synopsis:       USB device issues on suspend/resume
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Dec 02 01:40:00 +0000 2007
>Originator:     Jared D. McNeill
>Release:        NetBSD 4.99.38
System: NetBSD 4.99.38 NetBSD 4.99.38 (GENERIC) #67: Sat Dec 1 13:18:42 EST 2007 amd64
Architecture: x86_64
Machine: amd64
	On some machines, USB devices disappear and reappear on a suspend and
	resume cycle.

	Device attachment status should be tracked across this transaction. In
	the ideal case through a suspend/resume cycle:
		* don't remove device: device stays attached
		* remove device: device detaches on resume
		* add new device: device attaches on resume
		* remove and re-add device: device detaches and re-attaches
		  on resume

	This works in some configurations, but not always.
	Attach a USB device, suspend and resume, inspect dmesg to see if
	the device detaches and reattaches.
	Not known.