Does the sound come from the PC speakers or from the scanner? Check and make sure the scanner is properly detected dmesg and see if you have something that looks like this when you plug in the scanner usb 5-1: new low speed USB device using uhci_hcd and address 2 usb 5-1: new device found, idVendor=0000, idProduct=0001 usb 5-1: new device strings: Mfr=0, Product=0, SerialNumber=0 usb 5-1: configuration #1 chosen from 1 choice input: HID 0000:0001 as /class/input/input6 input: USB HID v1.00 Keyboard [HID 0000:0001] on usb-0000:00:10.3-1 if you see the above, then you should also see events in dmesg after you push the scan button. If you dont see the above, then you probably need to initialize the usb keyboard module with you might try sudo modprobe usbkbd • reference.

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