On Sun, 2 Feb 2020, Galen Seitz wrote:
I suggest using lsusb to check for the scanner. This command will tell you
how much power every USB device is requesting. Look for your hub and the
connected devices and add up the current. The limit for USB 3.0 is 900 mA
total current.
Given what you have connected, I think the solution is probably going to be
connecting power to the hub.
galen,
I'm waiting for a webcam to arrive and am trying to determine whether it can
be connected to a USB 3.x hub. Running lsusb is not reporting any device
power consumption:
# lsusb
Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 011: ID 174c:55aa ASMedia Technology Inc. ASM1051E SATA 6Gb/s
bridge, ASM1053E SATA 6Gb/s bridge, ASM1153 SATA 3Gb/s bridge
Bus 002 Device 010: ID 05e3:0616 Genesys Logic, Inc. hub
Bus 002 Device 002: ID 05e3:0612 Genesys Logic, Inc.
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 004: ID 047d:2048 Kensington Orbit Trackball with Scroll Ring
Bus 001 Device 077: ID 2e04:c025
Bus 001 Device 107: ID 05e3:0610 Genesys Logic, Inc. 4-port hub
Bus 001 Device 002: ID 05e3:0610 Genesys Logic, Inc. 4-port hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
I have a 7-port 'Ports' hub connected to a USB port on the desktop's rear
panel. The hub is powered by a wall wart. The trackball and external backup
drives are connected to the hub (bus 001/device 004 and bus 002/device 010,
respectively). I don't have a separate 4-port hub connected.
Plugging in the cell phone charger doesn't change the above display. I don't
see anything in the lsusb man page about displaying power consumed. What am
I missing?
Regards,
Rich
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