On Mon, May 18, 2020 at 08:18:36PM +0200, Mac Goever wrote: > Hi Sean, > > yes, I can do that. Here are some log entries. I suspected the device > to disappear right after the "reset" entry. But this is not the case. > It might also disappear some seconds after the event. > > --- > [ 328.405481] usb 1-1.4: new high-speed USB device number 5 using dwc_otg > [ 328.537196] usb 1-1.4: New USB device found, idVendor=05e3, > idProduct=0605, bcdDevice= 6.0b > [ 328.537212] usb 1-1.4: New USB device strings: Mfr=0, Product=1, > SerialNumber=0 > [ 328.537221] usb 1-1.4: Product: USB2.0 Hub > [ 328.538152] hub 1-1.4:1.0: USB hub found > [ 328.538449] hub 1-1.4:1.0: 4 ports detected > [ 328.675475] usb 1-1.2: reset high-speed USB device number 4 using dwc_otg > [ 334.252684] usb 1-1.2: USB disconnect, device number 4 > [ 338.085480] usb 1-1.4.3: new high-speed USB device number 6 using dwc_otg > [ 338.216965] usb 1-1.4.3: New USB device found, idVendor=04a9, > idProduct=190e, bcdDevice= 7.04 > [ 338.216981] usb 1-1.4.3: New USB device strings: Mfr=1, Product=2, > SerialNumber=0 > [ 338.216991] usb 1-1.4.3: Product: CanoScan > [ 338.217000] usb 1-1.4.3: Manufacturer: Canon
Up to here, this is a normal USB enumeration. > [ 348.615487] usb 1-1.4.3: reset high-speed USB device number 6 using dwc_otg But here, 10 seconds after enumerating, we see an unexpected reset. > [ 781.257336] usb 1-1.4.3: USB disconnect, device number 6 And ~7 minutes later, the device disconnects. > [ 787.105074] usb 1-1.4.3: new high-speed USB device number 7 using dwc_otg > [ 787.236590] usb 1-1.4.3: New USB device found, idVendor=04a9, > idProduct=190e, bcdDevice= 7.04 > [ 787.236620] usb 1-1.4.3: New USB device strings: Mfr=1, Product=2, > SerialNumber=0 > [ 787.236630] usb 1-1.4.3: Product: CanoScan > [ 787.236639] usb 1-1.4.3: Manufacturer: Canon Another normal enumeration. > [ 791.095083] usb 1-1.4.3: reset high-speed USB device number 7 using dwc_otg And another unexpected reset after a few seconds. > [ 981.232218] usb 1-1.4.3: USB disconnect, device number 7 This time, the disconnect happened in ~3 minutes. > [ 991.254819] usb 1-1.4.3: new high-speed USB device number 8 using dwc_otg > [ 991.386331] usb 1-1.4.3: New USB device found, idVendor=04a9, > idProduct=190e, bcdDevice= 7.04 > [ 991.386348] usb 1-1.4.3: New USB device strings: Mfr=1, Product=2, > SerialNumber=0 > [ 991.386358] usb 1-1.4.3: Product: CanoScan > [ 991.386367] usb 1-1.4.3: Manufacturer: Canon > [ 2101.778329] usb 1-1.4.3: USB disconnect, device number 8 > [ 2279.596695] usb 1-1.4: USB disconnect, device number 5 > [78022.354395] usb 1-1.2: new high-speed USB device number 9 using dwc_otg > [78022.486136] usb 1-1.2: New USB device found, idVendor=05e3, > idProduct=0605, bcdDevice= 6.0b > [78022.486152] usb 1-1.2: New USB device strings: Mfr=0, Product=1, > SerialNumber=0 > [78022.486161] usb 1-1.2: Product: USB2.0 Hub > [78022.487104] hub 1-1.2:1.0: USB hub found > [78022.487402] hub 1-1.2:1.0: 4 ports detected A USB hub was plugged in. Notice that this device doesn't ever have a reset, so it's behaving correctly. > [78022.804366] usb 1-1.2.3: new high-speed USB device number 10 using dwc_otg > [78022.935681] usb 1-1.2.3: New USB device found, idVendor=04a9, > idProduct=190e, bcdDevice= 7.04 > [78022.935690] usb 1-1.2.3: New USB device strings: Mfr=1, Product=2, > SerialNumber=0 > [78022.935695] usb 1-1.2.3: Product: CanoScan > [78022.935699] usb 1-1.2.3: Manufacturer: Canon The scanner was plugged in, presumably into the hub. > [78032.084421] usb 1-1.2.3: reset high-speed USB device number 10 using > dwc_otg And our friend the reset is back. In short, the issue is almost certainly in hardware. My prime suspects would be: - Insufficient power supply stability. This refers to both current capacity and voltage sag, the latter of which can be hard to test. Additionally, a real 10 A 5 V power supply should be fairly large, comparable to a medium-size laptop brick. If your 10 A supply is a wall wart, I would be very suspicious of it. If you have a good multimeter, I would suggest measuring the 5 V rail on the Pi's GPIO headers while you have the scanner plugged in. Anything below 4.9 V would be concerning. - Flaky USB cable. Try another one if you have it, the shorter the better. - Flaky USB port. Try the other ports on the Pi just to see. - Flaky powered USB hub / poor quality hub power supply. Cheap hubs often have equally cheap power supplies. - Damaged USB subsystem on Pi. This one is unlikely, but it may be worth testing other USB devices (e.g. a thumb drive) on your Pi and see if you get similar issues. Hopefully this helps narrow down the issue. --Sean
