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can't open usb device if connect to pi before raspbian boot
Posted: Sun Feb 12, 2017 6:22 am
by sxd1140
i have a usb device connected to pi first
then pi power on
lsusb the usb device not display
usb device plug out and in once
lssub can display this device
how can i fix this
like this
viewtopic.php?f=28&t=69505
thanks.
Re: can't open usb device if connect to pi before raspbian b
Posted: Sun Feb 12, 2017 11:52 pm
by topguy
Tell us more about the device.
Look at the output from "dmesg" command in both scenarios and see if there are some errors related to your device.
Re: can't open usb device if connect to pi before raspbian b
Posted: Mon Feb 13, 2017 3:31 am
by peterlite
There are some USB SATA chips with this problem. Use lsusb. Search for the chip ID you find in lsusb. You will see lines like the following. You want the
0cf3:3005 part.
Code: Select all
Bus 002 Device 005: ID 0cf3:3005 Atheros Communications, Inc. AR3011 Bluetooth
Re: can't open usb device if connect to pi before raspbian b
Posted: Wed Mar 08, 2017 1:35 am
by sxd1140
at last i let USB device reboot once to solve this issue.
thanks all.