When I plug it in, dmesg shows:
usb 3-2: new full speed USB device using address 5
in /proc/bus/usb/devices it lists as:
T: Bus=03 Lev=01 Prnt=01 Port=01 Cnt=02 Dev#= 5 Spd=12 MxCh= 0
D: Ver= 1.10 Cls=ff(vend.) Sub=ff Prot=ff MxPS=64 #Cfgs= 1
P: Vendor=0fca ProdID=0001 Rev= 1.04
S: Manufacturer=Research In Motion
S: Product=Terminal mobile RIM
C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=100mA
I: If#= 0 Alt= 0 #EPs= 4 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none)
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=02(Bulk) MxPS= 64 Ivl=0ms
E: Ad=04(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms
The BB is the only USB device I have plugged in to the machine.
W
Alan Stern wrote:
Warren, when the iPod or BlackBerry is plugged in for recharging, does a
notification appear in the system log? Does the device get listed in
/proc/bus/usb/devices?
If not, that probably means the device is connected electrically but not
logically -- it hasn't told the computer that it's attached to the USB
port. (In technical terms, it hasn't turned on its D+ pullup resistor.)
When no devices are attached to them, Linux does put USB controllers into
a power-saving mode. Whether this means the amount of current delivered
to the ports gets reduced is unclear (i.e., not documented).
On the other hand, it _is_ clearly documented in the USB Specification
that when a device hasn't told the computer it's attached, it's entitled
to draw no more than 0.5 mA of current. If it does tell the computer it's
attached, it may be allowed to draw as much as 500 mA.
There's a bunch of "if"s here, and I can't tell what's really going on
without more information. For instance, what shows up in the output from
dmesg after the iPod or BlackBerry is plugged in? Do you have any other
USB devices plugged in at the same time?
For the disk drive these questions don't arise -- obviously the unit lets
Linux know when it is plugged in. And maybe it does have problems... but
how can you be sure those problems are at all related to the power supply?
Alan Stern
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