Re: Behaviour of USB Device in low powered state
- From: "Doron Holan [MS]" <doronh@xxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 12 Jan 2007 22:11:24 -0800
is your device remote wake capapble? is it reporting this capability in the
appropriate descriptor?
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"Neo" <rksandilya@xxxxxxxxx> wrote in message
news:1168595024.966780.248840@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hi Mr.Doron,
i did sending the IRP_MN_WAIT_WAKE before going to the low powered
state, but my driver is not getting notified when the USB device got
disconnected, my wakecompletion is only getting called when an external
wakeup(thru mouse or keyboard) occcurs.
The other question will be is there any other way where i can get
notification to my driver when a USB device gets disconnected.
Thanks and Regards,
Neo
Doron Holan [MS] wrote:
send an IRP_MN_WAIT_WAKE irp before powering off (by calling
PoRequestPowerIrp)
d
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"Neo" <rksandilya@xxxxxxxxx> wrote in message
news:1168511903.310681.182760@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hi,
Thanks Mr.Tim and Mr.Doron,
Thanks for your support.
my device will be used for desktop system and it is such that the USB
Device need to be always attached to the system and if it get disc. for
some reason then the user need to be intimated and hence i need to wake
up the system when the usb device get disc.
can you help me telling what to do in the driver to wakeup the system
when the USB Device got disc. in the low powered state.
Regards,
Neo
Doron Holan [MS] wrote:
and IMHO, waking the system on unplug is an awful experience for the
user.
imagine a laptop that is in a docking station with usb devices
attached
through the dock and is put into standby and then undocked. you want
the
machine to wake b/c the devices in the dock disappeared? yuck.
d
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"Tim Roberts" <timr@xxxxxxxxx> wrote in message
news:e7mbq29edf14l3fp6vb267s5n7t2vq7b61@xxxxxxxxxx
"Neo" <rksandilya@xxxxxxxxx> wrote:
i am naive and writing driver for a usb device, i just wanted to
know
the behaviour of a USB Device when disconnected(surprise removal,
plug
out) in the low powered state(standby).
i see some of the devices get the system wakeup when the USB Devices
are disconnected in the standby mode, and some do not.
which is the correct behaviour ???
It depends entirely on your device. If you don't need to take any
particular action when your device is unplugged (and most driver's
don't),
then there is no need for you to wake the system.
--
Tim Roberts, timr@xxxxxxxxx
Providenza & Boekelheide, Inc.
.
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