On Fri, Dec 06, 2002, Luca Rota <[EMAIL PROTECTED]> wrote: > Il 02:37, venerd� 6 dicembre 2002, Johannes Erdfelt ha scritto: > > On Fri, Dec 06, 2002, Luca Rota <[EMAIL PROTECTED]> wrote: > > > > 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? Which UHCI chipset do you have? (lspci will tell you) > > 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 > T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 2 > B: Alloc=236/900 us (26%), #Int= 2, #Iso= 0 > D: Ver= 1.00 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 > P: Vendor=0000 ProdID=0000 Rev= 0.00 > S: Product=USB UHCI Root Hub > S: SerialNumber=e400 > C:* #Ifs= 1 Cfg#= 1 Atr=40 MxPwr= 0mA > I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub > E: Ad=81(I) Atr=03(Int.) MxPS= 8 Ivl=255ms > > Other hub: > T: Bus=01 Lev=01 Prnt=01 Port=01 Cnt=02 Dev#= 52 Spd=12 MxCh= 4 > D: Ver= 1.01 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 > P: Vendor=05e3 ProdID=0604 Rev= 0.12 > S: Product=USB Hub > C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=100mA > I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub > E: Ad=81(I) Atr=03(Int.) MxPS= 1 Ivl=255ms 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.... JE ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
