Não sei ao certo por que a resposta aceita é tão votada, hwinfo --usb não fornece informações de energia nem lsusb -v -t . Veja por si mesmo:
hwinfo
(Ubuntu 12.04)
% lsb_release -a|grep Des
Description: Ubuntu 12.04.1 LTS
% hwinfo --usb
...
...
14: USB 00.0: 10900 Printer
[Created at usb.122]
UDI: /org/freedesktop/Hal/devices/usb_device_4a9_1069_206NL6_if0_printer_noserial
Unique ID: IO+7.s5u63YPdXG8
Parent ID: Uc5H.d7FDLX76qXB
SysFS ID: /devices/pci0000:00/0000:00:12.2/usb1/1-4/1-4.4/1-4.4:1.0
SysFS BusID: 1-4.4:1.0
Hardware Class: printer
Model: "Canon S820"
Hotplug: USB
Vendor: usb 0x04a9 "Canon"
Device: usb 0x1069 "S820"
SubVendor: "Canon"
SubDevice: "S820"
Revision: "1.02"
Serial ID: "206NL6"
Driver: "usblp"
Driver Modules: "usblp"
Device File: /dev/usb/lp0
Device Number: char 180:0
Speed: 12 Mbps
Module Alias: "usb:v04A9p1069d0102dc00dsc00dp00ic07isc01ip02"
Driver Info #0:
Driver Status: usblp is active
Driver Activation Cmd: "modprobe usblp"
Config Status: cfg=new, avail=yes, need=no, active=unknown
Attached to: #11 (Hub)
(Fedora 14)
% lsb_release -a|grep Desc
Description: Fedora release 14 (Laughlin)
% hwinfo --usb
...
...
09: USB 00.0: 10e00 Chipcard Reader
[Created at usb.122]
Unique ID: Bgjr.EgDcOidyXjF
Parent ID: FKGF.0j9+vWlqL56
SysFS ID: /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.5/2-1.5:1.0
SysFS BusID: 2-1.5:1.0
Hardware Class: chipcard
Model: "Lenovo Integrated Smart Card Reader"
Hotplug: USB
Vendor: usb 0x17ef "Lenovo"
Device: usb 0x1003 "Integrated Smart Card Reader"
Revision: "1.00"
Driver: "usbfs"
Driver Modules: "usbcore"
Speed: 12 Mbps
Module Alias: "usb:v17EFp1003d0100dc00dsc00dp00ic0Bisc00ip00"
Config Status: cfg=new, avail=yes, need=no, active=unknown
Attached to: #6 (Hub)
lsbusb -v -t
(Ubuntu 12.04)
% lsusb -v -t
/: Bus 07.Port 1: Dev 1, Class=root_hub, Driver=ohci_hcd/2p, 12M
/: Bus 06.Port 1: Dev 1, Class=root_hub, Driver=ohci_hcd/3p, 12M
/: Bus 05.Port 1: Dev 1, Class=root_hub, Driver=ohci_hcd/3p, 12M
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=ohci_hcd/3p, 12M
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=ohci_hcd/3p, 12M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/6p, 480M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci_hcd/6p, 480M
|__ Port 4: Dev 3, If 0, Class=hub, Driver=hub/4p, 480M
|__ Port 3: Dev 5, If 0, Class=stor., Driver=usb-storage, 480M
|__ Port 4: Dev 4, If 0, Class=print, Driver=usblp, 12M
(Fedora 14)
% lsusb -v -t
Bus# 2
'-Dev# 1 Vendor 0x1d6b Product 0x0002
'-Dev# 2 Vendor 0x8087 Product 0x0020
|-Dev# 3 Vendor 0x046d Product 0xc521
'-Dev# 4 Vendor 0x17ef Product 0x1003
Bus# 1
'-Dev# 1 Vendor 0x1d6b Product 0x0002
'-Dev# 2 Vendor 0x8087 Product 0x0020
Então, o que funciona?
Apenas um lsusb -v normal antigo fornece as informações de energia.
% lsusb -v|egrep "^Bus|MaxPower"
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MaxPower 0mA
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MaxPower 0mA
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MaxPower 0mA
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MaxPower 0mA
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MaxPower 0mA
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MaxPower 0mA
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MaxPower 0mA
Bus 001 Device 003: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB
MaxPower 100mA
Bus 003 Device 002: ID 046d:c517 Logitech, Inc. LX710 Cordless Desktop Laser
MaxPower 98mA
Bus 001 Device 004: ID 04a9:1069 Canon, Inc. S820
MaxPower 2mA
Bus 001 Device 005: ID 05ac:120a Apple, Inc. iPod Nano
MaxPower 500mA
MaxPower 500mA
NOTA: Deve-se notar que isso não parece mostrar a quantidade máxima que a porta pode fornecer, mas a quantidade máxima que o dispositivo pode desenhar na porta em que está conectado.
Comentários adicionais
Também devo mencionar que hwinfo não era um pacote padrão que estava disponível para minha versão particular do Fedora. Eu tive que baixar download e compile para mim no Fedora !
