Don Quixote de la Mancha kirjoitti keskiviikko, 17. maaliskuuta 2010 11:42:14: > On Wed, Mar 17, 2010 at 2:28 AM, Kari Somby <familyzombie@xxxxxxxxx> wrote: > > It can be something on your USB device or USB port. > > To clarify, your motherboard may not be applying device power to your > USB ports. I don't think USB power is actually required by the > protocol spec, rather its an optional feature. Even if power is > provided, the amount provided may be insufficient for your particular > device. That's parly true. The protocol says that max current for one USB host is 500 mA. I even have USB -> phone adapter enabling charge my cellphones using USB port. There are 4 wires in USB cable: 0V, +5V, +data and -data (if I remember right). Almost forgot, I have USB LED light. A simple bright LED that gets its power from USB port. > > When using USB purely powering purposes, no drivers are needed - only > > thing is that USB devices are enabled. > > That's usually the case, but its not true in general. To charge a > Motorola RAZR from USB, one needs special software. There are several > freeware packages that enable RAZR charging. I only tried on Mac OS > X; I don't know whether there is a Linux package that does it. This must be software for the Motorola RAZR. i.e. computer driver sends information to RAZR that it can now charge it's battery. -- Kapi -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
