su sane-find-scanner
found USB scanner (vendor=0x04f9 [Brother], product=0x0224 [DCP-375CW]) at libusb:002:004
found USB scanner (vendor=0x0bda [Generic], product=0x0129 [USB2.0-CRW]) at libusb:002:003
lsusb -t
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M
/: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 480M
|__ Port 3: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
/: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M
|__ Port 5: Dev 3, If 0, Class=Vendor Specific Class, Driver=rtsx_usb, 480M
|__ Port 6: Dev 4, If 2, Class=Mass Storage, Driver=usb-storage, 12M
|__ Port 6: Dev 4, If 0, Class=Printer, Driver=usblp, 12M
|__ Port 6: Dev 4, If 1, Class=Vendor Specific Class, Driver=, 12M
/: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M
|__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/6p, 480M
|__ Port 1: Dev 3, If 1, Class=Video, Driver=uvcvideo, 480M
|__ Port 1: Dev 3, If 0, Class=Video, Driver=uvcvideo, 480M
|__ Port 3: Dev 4, If 0, Class=Wireless, Driver=, 12M
|__ Port 3: Dev 4, If 1, Class=Wireless, Driver=, 12M
tail -f /var/log/kern.log
Mar 19 15:29:45 machine kernel: [ 4886.500523] in libglib-2.0.so.0.5000.3[7f75f168a000+112000]
Mar 19 15:29:45 machine kernel: [ 4886.620971] ACPI Warning: _SB.PCI0.PEG0.PEGP.DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20160831/nsarguments-95)
Mar 19 15:29:45 machine kernel: [ 4886.621264] ACPI: _SB.PCI0.PEG0.PEGP: failed to evaluate _DSM
Mar 19 15:29:45 machine kernel: [ 4886.621268] ACPI Warning: _SB.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20160831/nsarguments-95)
Mar 19 15:29:45 machine kernel: [ 4886.621438] nouveau 0000:01:00.0: DRM: evicting buffers…
Mar 19 15:29:45 machine kernel: [ 4886.621439] nouveau 0000:01:00.0: DRM: waiting for kernel channels to go idle…
Mar 19 15:29:45 machine kernel: [ 4886.621459] nouveau 0000:01:00.0: DRM: suspending client object trees…
Mar 19 15:29:45 machine kernel: [ 4886.622688] nouveau 0000:01:00.0: DRM: suspending kernel object tree…
Mar 19 15:30:11 machine kernel: [ 4912.167365] usblp0: removed
Mar 19 15:30:41 machine kernel: [ 4942.180106] usblp 2-1.6:1.0: usblp0: USB Bidirectional printer dev 4 if 0 alt 0 proto 2 vid 0x04F9 pid 0x0224
Mar 19 15:41:36 machine kernel: [ 5597.965373] usb 2-1.6: USB disconnect, device number 4
Mar 19 15:41:36 machine kernel: [ 5597.965698] usblp0: removed
Mar 19 15:41:43 machine kernel: [ 5604.343851] usb 2-1.6: new full-speed USB device number 5 using ehci-pci
Mar 19 15:41:43 machine kernel: [ 5604.457949] usb 2-1.6: New USB device found, idVendor=04f9, idProduct=0224
Mar 19 15:41:43 machine kernel: [ 5604.457951] usb 2-1.6: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Mar 19 15:41:43 machine kernel: [ 5604.457952] usb 2-1.6: Product: DCP-375CW
Mar 19 15:41:43 machine kernel: [ 5604.457953] usb 2-1.6: Manufacturer: Brother
Mar 19 15:41:43 machine kernel: [ 5604.457954] usb 2-1.6: SerialNumber: BROE9F197221
Mar 19 15:41:43 machine kernel: [ 5604.459018] usblp 2-1.6:1.0: usblp0: USB Bidirectional printer dev 5 if 0 alt 0 proto 2 vid 0x04F9 pid 0x0224
Mar 19 15:41:43 machine kernel: [ 5604.459150] usb-storage 2-1.6:1.2: USB Mass Storage device detected
Mar 19 15:41:43 machine kernel: [ 5604.459234] scsi host6: usb-storage 2-1.6:1.2
Mar 19 15:41:44 machine kernel: [ 5605.492798] scsi 6:0:0:0: Direct-Access Brother DCP-375CW 1.00 PQ: 0 ANSI: 2
Mar 19 15:41:44 machine kernel: [ 5605.493157] sd 6:0:0:0: Attached scsi generic sg2 type 0
Mar 19 15:41:44 machine kernel: [ 5605.552657] sd 6:0:0:0: [sdb] Attached SCSI removable disk