Date: Mon, 5 Jun 2006 14:01:23 +0200 (CEST) From: "Julian Stacey" <jhs@berklix.org> To: freebsd-usb@freebsd.org Cc: garyj@jennejohn.org Subject: usbdevs "self powered" is misleading Message-ID: <200606051201.k55C1NHd087760@fire.jhs.private>
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"self powered" is reported by 6.1-RELEASE usbdevs for my small external disc.
It seems a misnomer & should at most be "Can be self powered" ?
The disc housing has a socket to apply power, but was not plugged
in. (I don't even have a power supply for it). Disc was cabled
direct to laptop, not through a hub, & showed:
Controller /dev/usb1:
addr 1: full speed, self powered, config 1, UHCI root hub(0x0000),
Intel(0x0000), rev 1.00
port 1 addr 2: full speed, self powered, config 1,
USB 2.0 Storage Device(0x5621), vendor 0x0402(0x0402), rev 1.03
When I added a USB-2 Hub (with hub power supply plugged in to 220V)"
Controller /dev/usb1:
addr 1: full speed, self powered, config 1, UHCI root hub(0x0000),
Intel(0x0000), rev 1.00
port 1 addr 2: full speed, self powered, config 1,
USB2.0 Hub Cont(0x0058), NEC Corporation(0x0409), rev 1.00
port 1 addr 5: full speed, self powered, config 1,
USB 2.0 Storage Device(0x5621), vendor 0x0402(0x0402), rev 1.03
Sometimes "self powered" seems correct though, as for eg:
- a GPS with battery inside.
- a USB2-IDE + 3.5" IDE disc + external 220V supply
Comments ?
Julian
--
Julian Stacey. Internet & Unix Consultant, Munich. http://berklix.com
Mail in Ascii, HTML = spam. Ihr Rauch = mein allergischer Kopfschmerz.
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