Spoiler:
[ 6356.701113] usb 4-2.4.4: new low-speed USB device number 18 using uhci_hcd
[ 6356.830114] usb 4-2.4.4: New USB device found, idVendor=1949, idProduct=dead
[ 6356.830122] usb 4-2.4.4: New USB device strings: Mfr=0, Product=1, SerialNumber=0
[ 6356.830127] usb 4-2.4.4: Product: USB Charger
[ 6356.846197] input: USB Charger as /devices/pci0000:00/0000:00:1d.2/usb4/4-2/4-2.4/4-2.4.4/4-2.4.4:1.0/input/input16
[ 6356.846384] hid-generic 0003:1949: DEAD.0008: input,hidraw4: USB HID v1.11 Device [USB Charger ] on usb-0000:00:1d.2-2.4.4/input0
[ 6357.526117] usb 4-2.4.4: USB disconnect, device number 18
[ 6370.653124] usb 4-2.4.4: new full-speed USB device number 19 using uhci_hcd
[ 6370.755115] usb 4-2.4.4: not running at top speed; connect to a high speed hub
[ 6370.779120] usb 4-2.4.4: New USB device found, idVendor=1949, idProduct=0004
[ 6370.779127] usb 4-2.4.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 6370.779132] usb 4-2.4.4: Product: Amazon Kindle
[ 6370.779136] usb 4-2.4.4: Manufacturer: Amazon
[ 6370.779140] usb 4-2.4.4: SerialNumber: XXXXXXXXXXXXXX
[ 6370.786307] scsi16 : usb-storage 4-2.4.4:1.0
[ 6447.510132] usb 4-2.4.4: USB disconnect, device number 19
This is what I've found with dmesg, it's ok ?