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Old September 12th 03, 05:32 PM
Marc Reinig
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I think we really have two issues,

1. The OP had a problem with not being able to run a bus powered USB device
when his host was turned off.

I presume that this was because there was no Vusb present on the bus to
power his device. Adding a powered hub will not help here because, with no
Vusb from the host, the hub will not enable (power) any down stream ports.

2. Separate issue: some hosts are reported to support some USB devices, for
wake-up, when they are supposedly powered off.

Vendors do many non standard things in the BIOS. The last I looked, this
would be one, so I have some questions on these features, if anyone want to
take the time ;=):

a. If you execute a Shutdown from the Start Menu (Turn Off on the XP
Start Menu as opposed to StandBy), can you wake your system with your mouse
or keyboard? Is the power light on, off or flashing?

b. When your system powers on, does it go through the full BIOS check,
etc?

c. My MS keyboard has a sleep button on it, which puts the system, almost
instantly, into a sleep mode from which it can be wakened by a press of a
key. But, this is not a powered down mode, the power light is flashing, not
off, RAM is still powered and refreshed, etc. I assume this is not what we
are talking about.

d. Do your USB keyboards and mice still power on the system when
connected through an external hub when your system is in this powered down
(but apparently not out) mode or do they need to be plugged into the root
hub, i.e. does the BIOS support hub devices or just mice, keyboards, etc.
that are directly attached?

e. Do all USB ports receive power when the system is in this state, or
only ones that have a mouse, keyboard or bootable device attached?

Thanks in advance,

Marc Reinig
System Solutions


This is
"Jim Turner" wrote in message
s.com...
Can't give specifics right now. I know that various multimedia keyboards
that are USB and have the power button on them from Microsoft, Logitech,
and some others will wake up motherboards I have tried it on from ASUS,
ECS, and MSI, although don't have specifics handy right now. Just have to
have legacy USB support on in the BIOS, and a real ATX system. Modern ATX
systems don't completely power off unless you pull the plug or throw the
switch on the back of some power supplies. The 5vsb voltage is there to
the PS/2 ports and some USB ports. Have seen some of the optical mice
with the lights on and the system "off".

JT

PS. haven't done anything with Macs for years.
On Tue, 09 Sep 2003 23:34:24 GMT, "Marc Reinig"
wrote:

Can you tell me which USB keyboards or USB network adapters can wake a
Windows PC when the PC is turned off or which Windows PC keeps USB power

on
when they are shut off?

We're not talking about standby, we're talking about OFF. Perhaps you

are
thinking of the ability to turn on a MAC through the keyboard? I don't
think the above things are possible in Windows.

Marc Reinig
System Solutions