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-   -   usb eject power still on (https://www.linuxquestions.org/questions/linux-newbie-8/usb-eject-power-still-on-4175578798/)

Darryn E Stent 05-01-2016 11:23 PM
usb eject power still on
 
when i eject usb it goes but still live with power . i run linux mint 17.3 and no nothing ,i tryed to unmount but no

yooy 05-02-2016 04:52 AM
Isn't usb interface always under current? Didn't heard of motherboard that switch power off, but if you need cable with harware switch I can provide one.

Darryn E Stent 05-02-2016 05:48 AM
Quote:
Originally Posted by yooy (Post 5539366)
Isn't usb interface always under current? Didn't heard of motherboard that switch power off, but if you need cable with harware switch I can provide one.
please yes :)

273 05-02-2016 06:52 AM
Quote:
Originally Posted by yooy (Post 5539366)
Isn't usb interface always under current? Didn't heard of motherboard that switch power off, but if you need cable with harware switch I can provide one.
That is my understanding also -- I am not sure that it is possible for the OS to remove power from the USB port if that means overriding the hardware?

Soadyheid 05-02-2016 08:32 AM
Quote:
when i eject usb it goes but still live with power
As I understand it, "Eject" and "Safely remove drive" both unmount the attached USB drive/memory stick from your file system so physically removing the device won't cause any file system corruption. There's no hardware on the motherboard which will "switch off" the power to the USB ports.

Play Bonny!

:hattip:

zOSGuy 05-02-2016 09:10 AM
Maybe depends on the mobo or the linux release
 
I have a sandisk usb with a light in it... when I eject it on my desktop running Squeeze, the light remains on. On my laptop running Jessie, when I eject or "safely remove" the light goes out and remains out. I'd say that "it depends". If it's a big deal I suppose I could boot my desktop on Jessie from USB and test whether it's the mobo or the release, but either way the answer is likely "maybe, maybe not".

DavidMcCann 05-02-2016 10:58 AM
On my desktop, the USB ports are always live so long as the computer is connected to the mains and that socket is live - even if the computer is switched off. I use USB for backups every day and just unmounting is OK.

rtmistler 05-02-2016 11:12 AM
The "eject" is to ensure files are closed and the file system is unmounted. Has nothing to do with power.

Correct also that the motherboard will still provide power to any USB accessory while it is physically plugged in, and the motherboard is powered on and operating. Excepting probably deep sleep/hibernate. Meanwhile there are also wake from hibernate via USB signalling cases.

jamison20000e 05-02-2016 11:50 AM
I have some control over this in my BIOS so I can use my T420 as a portable device charger. ;)

Darryn E Stent 05-04-2016 08:41 PM
usb
 
Quote:
Originally Posted by yooy (Post 5539366)
Isn't usb interface always under current? Didn't heard of motherboard that switch power off, but if you need cable with harware switch I can provide one.
i have a ASUS H81M-E motherbored ana intel i3 in the bios you can turn of usb but if i do not shaw if it will work


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