Hi all, I'm using an ancient 4.17.1 kernel and I'm seeing an weird USB behavior. A touchscreen device is been detected and disconnected in a 4 seconds pattern. # dmesg | grep 1.3.2[ 2.170041] usb 1-1.3.2: new full-speed USB device number 6 using ehci-pci [ 2.254868] input: Silicon Works Multi-touch SW4101C as /devices/pci0000:00/0000:00:12.0/usb1/1-1/1-1.3/1-1.3.2/1-1.3.2:1.0/0003:29BD:4101.0001/input/input2 [ 2.254958] hid-multitouch 0003:29BD:4101.0001: input: USB HID v1.00 Mouse [Silicon Works Multi-touch SW4101C] on usb-0000:00:12.0-1.3.2/input0 [ 6.776320] usb 1-1.3.2: USB disconnect, device number 6 [ 6.955040] usb 1-1.3.2: new full-speed USB device number 7 using ehci-pci [ 7.039215] input: Silicon Works Multi-touch SW4101C as /devices/pci0000:00/0000:00:12.0/usb1/1-1/1-1.3/1-1.3.2/1-1.3.2:1.0/0003:29BD:4101.0002/input/input4 [ 7.039306] hid-multitouch 0003:29BD:4101.0002: input: USB HID v1.00 Mouse [Silicon Works Multi-touch SW4101C] on usb-0000:00:12.0-1.3.2/input0 [ 11.383830] usb 1-1.3.2: USB disconnect, device number 7 [ 11.642043] usb 1-1.3.2: new full-speed USB device number 8 using ehci-pci [ 11.726858] input: Silicon Works Multi-touch SW4101C as /devices/pci0000:00/0000:00:12.0/usb1/1-1/1-1.3/1-1.3.2/1-1.3.2:1.0/0003:29BD:4101.0003/input/input6 [ 11.726947] hid-multitouch 0003:29BD:4101.0003: input: USB HID v1.00 Mouse [Silicon Works Multi-touch SW4101C] on usb-0000:00:12.0-1.3.2/input0 [ 16.247185] usb 1-1.3.2: USB disconnect, device number 8 [ 16.426042] usb 1-1.3.2: new full-speed USB device number 9 using ehci-pci [ 16.510970] input: Silicon Works Multi-touch SW4101C as /devices/pci0000:00/0000:00:12.0/usb1/1-1/1-1.3/1-1.3.2/1-1.3.2:1.0/0003:29BD:4101.0004/input/input8 [ 16.511067] hid-multitouch 0003:29BD:4101.0004: input: USB HID v1.00 Mouse [Silicon Works Multi-touch SW4101C] on usb-0000:00:12.0-1.3.2/input0 [ 20.854572] usb 1-1.3.2: USB disconnect, device number 9 [ 21.112042] usb 1-1.3.2: new full-speed USB device number 10 using ehci-pci [ 21.197973] input: Silicon Works Multi-touch SW4101C as /devices/pci0000:00/0000:00:12.0/usb1/1-1/1-1.3/1-1.3.2/1-1.3.2:1.0/0003:29BD:4101.0005/input/input10 [ 21.198072] hid-multitouch 0003:29BD:4101.0005: input: USB HID v1.00 Mouse [Silicon Works Multi-touch SW4101C] on usb-0000:00:12.0-1.3.2/input0 [ 25.717651] usb 1-1.3.2: USB disconnect, device number 10 [ 25.895018] usb 1-1.3.2: new full-speed USB device number 11 using ehci-pci [ 25.979810] input: Silicon Works Multi-touch SW4101C as /devices/pci0000:00/0000:00:12.0/usb1/1-1/1-1.3/1-1.3.2/1-1.3.2:1.0/0003:29BD:4101.0006/input/input12 [ 25.979909] hid-multitouch 0003:29BD:4101.0006: input: USB HID v1.00 Mouse [Silicon Works Multi-touch SW4101C] on usb-0000:00:12.0-1.3.2/input0 [ 30.325789] usb 1-1.3.2: USB disconnect, device number 11 [ 30.588021] usb 1-1.3.2: new full-speed USB device number 12 using ehci-pci [ 30.673335] input: Silicon Works Multi-touch SW4101C as /devices/pci0000:00/0000:00:12.0/usb1/1-1/1-1.3/1-1.3.2/1-1.3.2:1.0/0003:29BD:4101.0007/input/input14 [ 30.673381] hid-multitouch 0003:29BD:4101.0007: input: USB HID v1.00 Mouse [Silicon Works Multi-touch SW4101C] on usb-0000:00:12.0-1.3.2/input0 [ 35.188772] usb 1-1.3.2: USB disconnect, device number 12 [ 35.366040] usb 1-1.3.2: new full-speed USB device number 13 using ehci-pci [ 35.451447] input: Silicon Works Multi-touch SW4101C as /devices/pci0000:00/0000:00:12.0/usb1/1-1/1-1.3/1-1.3.2/1-1.3.2:1.0/0003:29BD:4101.0008/input/input16 [ 35.451498] hid-multitouch 0003:29BD:4101.0008: input: USB HID v1.00 Mouse [Silicon Works Multi-touch SW4101C] on usb-0000:00:12.0-1.3.2/input0 [ 39.795933] usb 1-1.3.2: USB disconnect, device number 13 [ 40.055019] usb 1-1.3.2: new full-speed USB device number 14 using ehci-pci [ 40.139578] input: Silicon Works Multi-touch SW4101C as /devices/pci0000:00/0000:00:12.0/usb1/1-1/1-1.3/1-1.3.2/1-1.3.2:1.0/0003:29BD:4101.0009/input/input18 [ 40.139626] hid-multitouch 0003:29BD:4101.0009: input: USB HID v1.00 Mouse [Silicon Works Multi-touch SW4101C] on usb-0000:00:12.0-1.3.2/input0 [ 44.659133] usb 1-1.3.2: USB disconnect, device number 14 [ 44.837018] usb 1-1.3.2: new full-speed USB device number 15 using ehci-pci [ 44.920784] input: Silicon Works Multi-touch SW4101C as /devices/pci0000:00/0000:00:12.0/usb1/1-1/1-1.3/1-1.3.2/1-1.3.2:1.0/0003:29BD:4101.000A/input/input20 [ 44.920828] hid-multitouch 0003:29BD:4101.000A: input: USB HID v1.00 Mouse [Silicon Works Multi-touch SW4101C] on usb-0000:00:12.0-1.3.2/input0 [ 49.266523] usb 1-1.3.2: USB disconnect, device number 15 [ 49.550012] usb 1-1.3.2: new full-speed USB device number 16 using ehci-pci [ 49.634659] input: Silicon Works Multi-touch SW4101C as /devices/pci0000:00/0000:00:12.0/usb1/1-1/1-1.3/1-1.3.2/1-1.3.2:1.0/0003:29BD:4101.000B/input/input22 [ 49.634706] hid-multitouch 0003:29BD:4101.000B: input: USB HID v1.00 Mouse [Silicon Works Multi-touch SW4101C] on usb-0000:00:12.0-1.3.2/input0 [ 54.129875] usb 1-1.3.2: USB disconnect, device number 16 [ 54.305025] usb 1-1.3.2: new full-speed USB device number 17 using ehci-pci [ 54.390293] input: Silicon Works Multi-touch SW4101C as /devices/pci0000:00/0000:00:12.0/usb1/1-1/1-1.3/1-1.3.2/1-1.3.2:1.0/0003:29BD:4101.000C/input/input24 [ 54.390342] hid-multitouch 0003:29BD:4101.000C: input: USB HID v1.00 Mouse [Silicon Works Multi-touch SW4101C] on usb-0000:00:12.0-1.3.2/input0 [ 58.737665] usb 1-1.3.2: USB disconnect, device number 17 [ 58.996040] usb 1-1.3.2: new full-speed USB device number 18 using ehci-pci [ 59.079931] input: Silicon Works Multi-touch SW4101C as /devices/pci0000:00/0000:00:12.0/usb1/1-1/1-1.3/1-1.3.2/1-1.3.2:1.0/0003:29BD:4101.000D/input/input29 [ 59.079981] hid-multitouch 0003:29BD:4101.000D: input: USB HID v1.00 Mouse [Silicon Works Multi-touch SW4101C] on usb-0000:00:12.0-1.3.2/input0 [ 63.932020] usb 1-1.3.2: reset full-speed USB device number 18 using ehci-pci After 12 disconnect messages sometime I see a reset message, like the shown in this trace, and the touch is not working. Sometime this reset it's not send and the touchs works ok. My guess is that the Xorg sometime runs and get access to touch before this 4 or 5 second watchdog is executed and then the touch is not disconnected this last time... Anybody has some experience in this kind of USB errors? Is it a known behavior modified in a more recent kernel? Any hint is welcome Jorge