lsusb gives:
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Bus 001 Device 002: ID 0bda:0111 Realtek Semiconductor Corp. Card Reader
Bus 001 Device 008: ID 1949:000a Lab126
Bus 005 Device 002: ID 15d9:0a4d Trust International B.V. Optical Mouse
Bus 006 Device 002: ID 04a9:220e Canon, Inc. CanoScan N1240U/LiDE 30
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
dmesg contains the following section:
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[ 1135.888986] usb 1-4: >USB disconnect, device number 4
[ 1136.224983] usb 1-4: >new high-speed USB device number 5 using ehci_hcd
[ 1136.364293] usb 1-4: >New USB device found, idVendor=1949, idProduct=000a
[ 1136.364304] usb 1-4: >New USB device strings: Mfr=2, Product=3, SerialNumber=4
[ 1136.364311] usb 1-4: >Product: Kindle
[ 1136.364316] usb 1-4: >Manufacturer: Amazon
[ 1136.364321] usb 1-4: >SerialNumber: D026A0A02416142W
[ 1151.328287] usb 1-4: >USB disconnect, device number 5
[ 1173.124913] usb 1-4: >new high-speed USB device number 6 using ehci_hcd
[ 1173.264130] usb 1-4: >New USB device found, idVendor=1949, idProduct=000a
[ 1173.264141] usb 1-4: >New USB device strings: Mfr=2, Product=3, SerialNumber=4
[ 1173.264149] usb 1-4: >Product: Kindle
[ 1173.264154] usb 1-4: >Manufacturer: Amazon
[ 1173.264159] usb 1-4: >SerialNumber: D026A0A02416142W
[ 1203.243748] usb 1-4: >USB disconnect, device number 6
[ 1203.579142] usb 1-4: >new high-speed USB device number 7 using ehci_hcd
[ 1203.717803] usb 1-4: >New USB device found, idVendor=1949, idProduct=000a
[ 1203.717814] usb 1-4: >New USB device strings: Mfr=2, Product=3, SerialNumber=4
[ 1203.717821] usb 1-4: >Product: Kindle
[ 1203.717826] usb 1-4: >Manufacturer: Amazon
[ 1203.717831] usb 1-4: >SerialNumber: D026A0A02416142W
[ 5945.194900] usb 1-4: >USB disconnect, device number 7
[ 5991.207325] usb 1-4: >new high-speed USB device number 8 using ehci_hcd
[ 5991.346651] usb 1-4: >New USB device found, idVendor=1949, idProduct=000a
[ 5991.346663] usb 1-4: >New USB device strings: Mfr=2, Product=3, SerialNumber=4
[ 5991.346670] usb 1-4: >Product: Kindle
[ 5991.346676] usb 1-4: >Manufacturer: Amazon
[ 5991.346681] usb 1-4: >SerialNumber: D026A0A02416142W
What should I try next?