7 May
2007
7 May
'07
3:20 p.m.
I upgraded my home PC to AMD64 dual core and the motherboard is ASUS
M2N-E Socket AM2 NVIDIA nForce 570 Ultra:
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131022
I've an M-Audio Midisport 4x4 MIDI box connected to the PC via USB.
On my old system (AthlonXP 2000, I forgot what kind of motherboard),
when the system was turned off, everything went dark.
But on the new system, the Midisport stays powered up even after the PC
is turned off. I can tell it's up because the green LED is still
blinking. The PC really is off, the disks are stopped, no moving parts
move, everything is cold.
Well, I guess this is more of a hardware question, but still, what's the
deal with USB on these new motherboards? Is the bus still powered even
after the system is turned off?
--
Florin Andrei
http://florin.myip.org/
8 May
8 May
6:02 a.m.
On Monday 07 May 2007 19:19, Florin Andrei wrote:
[...]
Well, I guess this is more of a hardware question, but
still, what's
the deal with USB on these new motherboards? Is the bus still
powered even after the system is turned off?
Yes, on some motherboards. It *might* be possible to select this in
the BIOS setup in some cases, but I can't remember seeing that option
anywhere yet. The boards I've seen so far either have USB power
whenever there is AC power, or they don't.
Maybe it's wired to the suspend-to-RAM logic in some cases...?
I believe the idea is that WLAN interfaces and the like should stay
awake, and potentially be able to wake the PC up when someone tries
to talk to it.
A side effect is that hardware that won't cold plug properly,
sometimes works just fine with motherboards that leave the USB power
on. Probably a coincidence, though; driver forgets to upload firmware
in the cold plug case, or something like that.
Also note that powered USB hubs are usually powered at all times, even
when not connected to a host.
//David Olofson - Programmer, Composer, Open Source Advocate
.------- http://olofson.net - Games, SDL examples -------.
| http://zeespace.net - 2.5D rendering engine |
| http://audiality.org - Music/audio engine |
| http://eel.olofson.net - Real time scripting |
'-- http://www.reologica.se - Rheology instrumentation --'
6:25 a.m.
Am Montag, 7. Mai 2007 schrieb Florin Andrei:
On my old system (AthlonXP 2000, I forgot what kind of
motherboard),
when the system was turned off, everything went dark.
But on the new system, the Midisport stays powered up even after the PC
is turned off. I can tell it's up because the green LED is still
blinking. The PC really is off, the disks are stopped, no moving parts
move, everything is cold.
Well, I guess this is more of a hardware question, but still, what's the
deal with USB on these new motherboards? Is the bus still powered even
after the system is turned off?
USB is still powered to support wake-up via keyboard/mouse?
Furthermore these new machines aren't off when you switch them off due to
acpi. Only real possibility to make them suck no energy is either the
mains-switch at the back of the power-supply or popping the power-cord out of
the machine or the wall...
Arnold
--
visit http://www.arnoldarts.de/
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to all your contacts.
After a month or so log in as root and do a rm / -rf. Or ask your
administrator to do so...
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2 comments
3 participants
participants (3)
-
Arnold Krille -
David Olofson -
Florin Andrei