woops, the ehci-hcd module had been unloaded. I
reloaded it and usbview reports the device as 480mb/s
again(as it had before)
usb 4-5: new high speed USB device using ehci_hcd and
address 8
scsi9 : SCSI emulation for USB Mass Storage devices
usb-storage: device found at 8
usb-storage: waiting for device to settle before
scanning
Vendor: Model: USB DISK 20X Rev: PMAP
Type: Direct-Access ANSI SCSI
revision: 00
SCSI device sdg: 974848 512-byte hdwr sectors (499 MB)
sdg: assuming Write Enabled
sdg: assuming drive cache: write through
SCSI device sdg: 974848 512-byte hdwr sectors (499 MB)
sdg: assuming Write Enabled
sdg: assuming drive cache: write through
sdg: sdg1
Attached scsi removable disk sdg at scsi9, channel 0,
id 0, lun 0
--- Alan Stern <[EMAIL PROTECTED]> wrote:
> On Sun, 16 Jan 2005, John H. wrote:
>
> > T: Bus=03 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2
> > Spd=12 MxCh= 0
> > D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64
> > #Cfgs= 1
> > P: Vendor=0d7d ProdID=1600 Rev= 1.00
> > S: Manufacturer=
> > S: Product=USB DISK 20X
> > S: SerialNumber=074B141802CC
> > C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=200mA
> > I: If#= 0 Alt= 0 #EPs= 3 Cls=08(stor.) Sub=06
> Prot=50
> > Driver=usb-storage
> > E: Ad=81(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms
> > E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms
> > E: Ad=83(I) Atr=03(Int.) MxPS= 64 Ivl=1ms
> >
> >
> > I just looked in usbview, it now says 12mb/s
> (Full)
> > for this one, and usb version 2.0
>
> That seems clear enough. Your device only gets USB
> 1.1 levels of
> throughput because it's running at 12 Mb/s, not 480
> Mb/s. (Note by the
> way that this is consistent with the device
> following the USB 2.0
> standard; the standard includes three speed levels
> -- low, full, and high
> -- and a USB 2.0 device is allowed to use any of the
> three.)
>
> So now maybe your question is why doesn't the device
> run at high speed?
> I don't know. Do you have the ehci_hcd module
> loaded? If yes, maybe the
> dmesg output after you plug in the device will have
> a clue. It may help
> to turn on the USB verbose debugging option in the
> kernel configuration,
> so more information will appear in the log.
>
> Alan Stern
>
>
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