Il 03:49, venerd́ 6 dicembre 2002, Johannes Erdfelt ha scritto:
> > > > > Is this a self powered or a bus powered hub?
> > > >
> > > > Both of them. And It always gives the same problem.
> > >
> > > It's likely you're trying to draw too much power from the hub. The ADSL
> > > modem requires 500ma according to the descriptors.
> >
> > The root hub? The modem is connected directly to the pc (it has 2 ports).
> > And if I connect the keyboard and the modem on root hub all it's ok.
> > If I connect the keyboard to the 4 ports hub (without the modem) all
> > again it's ok. But when I connect the modem (either to root hub or to 4
> > ports hub) I've th problem.
>
> You say that if you connect the keyboard and the modem to the root hub,
> it works, but then you said that if you connect the modem to either hub,
> it doesn't work. Which one is it?
Sorry!
Keyboard and modem connected to root hub all ok
Modem connected to root hub and keyboard to 4 ports hub -> problem
Keyboard and modem connected to 4 port hub -> problem
> Which UHCI chipset do you have? (lspci will tell you)
# lspci -v
00:07.2 USB Controller: VIA Technologies, Inc. USB (rev 11) (prog-if 00
[UHCI])
Subsystem: VIA Technologies, Inc. (Wrong ID): Unknown device 1234
Flags: bus master, medium devsel, latency 32, IRQ 9
I/O ports at e400 [size=32]
Capabilities: [80] Power Management version 2
> > > This is the maximum amount of power per port, but it may only have
> > > 500ma for all of the ports.
> > >
> > > Hmm, I wonder where the hub descriptor dump went.
> >
> > Here there's a cut from /proc/bus/usb/devices:
> > Root Hub
>
> No, no. The hub descriptor. There's a different descriptor which
> explains the features of the hub function.
>
> I can't think of an easy way to get it and display it right now....
And the hard way or a documente I can read.
Thank you,
Luca
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