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USB power

Postby ef37a » Wed Sep 18, 2019 7:39 am

It struck me yesterday that it would be handy to be able to charge my phone from my laptop when the latter is closed up.

I expected the USB 2 and 3 ports to power off in that state and they did so I went into Control Panel and turned off "Allow computer to turn off power" for each USB controller. Made not the slightest difference! I still cannot charge my phone from a folded up laptop.

It is an HP Pavilion g series. i3 4 core W7 Home. I have a W7 desktop that does keep the USB ports on when powered down.

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Re: USB power

Postby Smellthevalve » Wed Sep 18, 2019 1:32 pm

You could check the root hub settings in device manager
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Re: USB power

Postby ef37a » Wed Sep 18, 2019 1:39 pm

Smellthevalve wrote:You could check the root hub settings in device manager

Yes, diddo, all USB funtions are NOT under PC control...But they remain so!

Maybe a quirk of the HP MOBO?

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Re: USB power

Postby Pete Kaine » Wed Sep 18, 2019 3:39 pm

ef37a wrote:Maybe a quirk of the HP MOBO?

It is, some boards offer it, most don't and it tends to be common amongst tier 1 premium boards (Asus/Gigabyte) but quickly disappears on the more value orientated units.

I don't recall seeing it on a laptop, but given the focus on mobile power saving in general that isn't really a shock.
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Re: USB power

Postby ef37a » Wed Sep 18, 2019 4:16 pm

Pete Kaine wrote:
ef37a wrote:Maybe a quirk of the HP MOBO?

It is, some boards offer it, most don't and it tends to be common amongst tier 1 premium boards (Asus/Gigabyte) but quickly disappears on the more value orientated units.

I don't recall seeing it on a laptop, but given the focus on mobile power saving in general that isn't really a shock.

Thanks Pete. No big deal just thought the phone could charge at night along with the lappy.
Yes, the desktop I have is an Asus and quite elderly in PC terms. We found it handy because it could power a MIDI kbd whilst off. (kbd fed a 2496 on another PC)

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Re: USB power

Postby CS70 » Wed Sep 18, 2019 4:31 pm

You don't do it from the operating system, you do it from the motherboard hardware - i.e. the BIOS. When the machines is turned off, the OS is not running :)

Most modern motherboards allow the USB port to keep powering devices or even to wake up the machine if connected.

Just check your BIOS for something that sound like that.

PS: didnt see Peter's reply - I've almost had that functionality in the last years, even with my old Dell, but it can be that I've always had good motherboards :D :D :D
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Re: USB power

Postby ef37a » Wed Sep 18, 2019 5:08 pm

CS70 wrote:You don't do it from the operating system, you do it from the motherboard hardware - i.e. the BIOS. When the machines is turned off, the OS is not running :)

Most modern motherboards allow the USB port to keep powering devices or even to wake up the machine if connected.

Just check your BIOS for something that sound like that.

PS: didnt see Peter's reply - I've almost had that functionality in the last years, even with my old Dell, but it can be that I've always had good motherboards :D :D :D

Oooer! I keep out of the BIOS unless I absolutely have to go there C! As I told Pete, no biggy.

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Re: USB power

Postby CS70 » Wed Sep 18, 2019 5:10 pm

ef37a wrote:Oooer! I keep out of the BIOS unless I absolutely have to go there C! As I told Pete, no biggy.

Ahah yeah, like me from a soldered circuit :D
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Re: USB power

Postby DGL. » Wed Sep 18, 2019 11:35 pm

Pete Kaine wrote:
ef37a wrote:Maybe a quirk of the HP MOBO?

It is, some boards offer it, most don't and it tends to be common amongst tier 1 premium boards (Asus/Gigabyte) but quickly disappears on the more value orientated units.

I don't recall seeing it on a laptop, but given the focus on mobile power saving in general that isn't really a shock.

My Dell inspiron 5000 13" 2-in-1, Asus TP300LA and my Fujitsu AH512 all had/have this feature in some way or another, specificaly for mobile charging. I believe it's a BIOS option that has to be enabled though.

I have had it on some cheaper MOBO's as well, although I believe that was primarily for the "wake on key" function with USB keyboards.
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Re: USB power

Postby N i g e l » Thu Sep 19, 2019 10:48 am

I had the opposite problem - my USB MIDI keyboard / control surface / interfaces all remained powered up even with the PC off.

There is a setting in the Bios called somthing like ErP or DeepSleep (S4-S5) which controls this.

It will turn off USB power & reduce the standby power but you may loose the ability to wake from USB/Lan/Mouse/etc
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Re: USB power

Postby Pete Kaine » Fri Sep 20, 2019 1:02 pm

DGL. wrote:
Pete Kaine wrote:
ef37a wrote:Maybe a quirk of the HP MOBO?
I don't recall seeing it on a laptop, but given the focus on mobile power saving in general that isn't really a shock.

My Dell inspiron 5000 13" 2-in-1, Asus TP300LA and my Fujitsu AH512 all had/have this feature in some way or another, specificaly for mobile charging. I believe it's a BIOS option that has to be enabled though.

I stand corrected, I'm not paying enough attention to current mobile devices it seems!
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Re: USB power

Postby Martin Walker » Fri Sep 20, 2019 1:09 pm

Pete Kaine wrote:I stand corrected, I'm not paying enough attention to current mobile devices it seems!

Yep, that's exactly what Dave wanted it for - a 'current mobile device' to charge his phone from the laptop :smirk:


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Re: USB power

Postby Wonks » Sat Sep 21, 2019 9:07 am

Martin Walker wrote:Yep, that's exactly what Dave wanted it for - a 'current mobile device' to charge his phone from

Sounds like a good enough raisin to me.
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Re: USB power

Postby Pete Kaine » Mon Sep 23, 2019 4:29 pm

Wonks wrote:
Martin Walker wrote:Yep, that's exactly what Dave wanted it for - a 'current mobile device' to charge his phone from

Sounds like a good enough raisin to me.

That's the most tenuous connection to date.
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Re: USB power

Postby CS70 » Mon Sep 23, 2019 5:49 pm

Pete Kaine wrote:
Wonks wrote:
Martin Walker wrote:Yep, that's exactly what Dave wanted it for - a 'current mobile device' to charge his phone from

Sounds like a good enough raisin to me.

That's the most tenuous connection to date.

Probably a bluetooth one at 10mt.
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Re: USB power

Postby Pete Kaine » Tue Sep 24, 2019 10:24 am

CS70 wrote:
Pete Kaine wrote:
Wonks wrote:
Martin Walker wrote:Yep, that's exactly what Dave wanted it for - a 'current mobile device' to charge his phone from

Sounds like a good enough raisin to me.

That's the most tenuous connection to date.

Probably a bluetooth one at 10mt.

Whilst true, I'm not sure the response is fruity enough for the thread. :(
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Re: USB power

Postby CS70 » Tue Sep 24, 2019 10:43 am

Pete Kaine wrote:
CS70 wrote:
Pete Kaine wrote:
Wonks wrote:
Martin Walker wrote:Yep, that's exactly what Dave wanted it for - a 'current mobile device' to charge his phone from

Sounds like a good enough raisin to me.

That's the most tenuous connection to date.

Probably a bluetooth one at 10mt.

Whilst true, I'm not sure the response is fruity enough for the thread. :(

Then an Apple bluetooth connection? :D
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Re: USB power

Postby Pete Kaine » Tue Sep 24, 2019 3:58 pm

CS70 wrote:Then an Apple bluetooth connection? :D

:thumbup:
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Re: USB power

Postby DGL. » Tue Sep 24, 2019 6:22 pm

Here is Fujitsu's USB charge implementation from the AH512,

Anytime USB Charge
This function is available with certain USB 2.0 ports. Anytime USB Charge allows you to charge your phones / media devices even when the notebook is turned off.
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