Hi, i have problems with usb-keyboard on bananapi-r2 since 4.17. same keyboard works till 4.16. In 4.19-rc1 same issue occours. Keyboard is recognized and on keypress it is disconnected and connected again without anything written to console. dmesg (printk-debuglevel=8) looks like this: [ 77.292068] usb 1-1: USB disconnect, device number 2 [ 77.292068] usb 1-1: USB disconnect, device number 2 [ 77.472554] evbug: Disconnected device: input0 [ 77.472554] evbug: Disconnected device: input0 [ 77.632390] evbug: Disconnected device: input1 [ 77.632390] evbug: Disconnected device: input1 [ 77.773255] evbug: Disconnected device: input2 [ 77.773255] evbug: Disconnected device: input2 [ 78.342590] usb 1-1: new low-speed USB device number 3 using xhci-mtk [ 78.342590] usb 1-1: new low-speed USB device number 3 using xhci-mtk [ 78.545576] input: USB USB Keykoard as /devices/platform/1a1c0000.usb/usb1/1-1/1-1:1.0/0003:1C4F:0002.0003/input/input4 [ 78.545576] input: USB USB Keykoard as /devices/platform/1a1c0000.usb/usb1/1-1/1-1:1.0/0003:1C4F:0002.0003/input/input4 [ 78.627589] evbug: Connected device: input4 (USB USB Keykoard at usb-1a1c0000.usb-1/input0) [ 78.636266] hid-generic 0003:1C4F:0002.0003: input,hidraw0: USB HID v1.10 Keyboard [USB USB Keykoard] on usb-1a1c0000.usb-1/input0 [ 78.627589] evbug: Connected device: input4 (USB USB Keykoard at usb-1a1c0000.usb-1/input0) [ 78.655044] input: USB USB Keykoard Consumer Control as /devices/platform/1a1c0000.usb/usb1/1-1/1-1:1.1/0003:1C4F:0002.0004/input/input5 [ 78.636266] hid-generic 0003:1C4F:0002.0003: input,hidraw0: USB HID v1.10 Keyboard [USB USB Keykoard] on usb-1a1c0000.usb-1/input0 [ 78.655044] input: USB USB Keykoard Consumer Control as /devices/platform/1a1c0000.usb/usb1/1-1/1-1:1.1/0003:1C4F:0002.0004/input/input5 [ 78.734340] evbug: Connected device: input5 (USB USB Keykoard Consumer Control at usb-1a1c0000.usb-1/input1) [ 78.746118] input: USB USB Keykoard System Control as /devices/platform/1a1c0000.usb/usb1/1-1/1-1:1.1/0003:1C4F:0002.0004/input/input6 [ 78.734340] e[ 78.760069] evbug: Connected device: input6 (USB USB Keykoard System Control at usb-1a1c0000.usb-1/input1) vbug: Connected [ 78.770893] hid-generic 0003:1C4F:0002.0004: input,hidraw1: USB HID v1.10 Device [USB USB Keykoard] on usb-1a1c0000.usb-1/inpu t1 device: input5 (USB USB Keykoard Consumer Control at usb-1a1c0000.usb-1/input1) [ 78.746118] input: USB USB Keykoard System Control as /devices/platform/1a1c0000.usb/usb1/1-1/1-1:1.1/0003:1C4F:0002.0004/input/input6 [ 78.760069] evbug: Connected device: input6 (USB USB Keykoard System Control at usb-1a1c0000.usb-1/input1) [ 78.770893] hid-generic 0003:1C4F:0002.0004: input,hidraw1: USB HID v1.10 Device [USB USB Keykoard] on usb-1a1c0000.usb-1/input1 can i debug this further? i see that mtk_xhci-driver was rewritten to use new api https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/usb/host/xhci-mtk.c?h=v4.17-rc1&id=6ae9f5062aa6f5a301c16715c601c05bc9aa450e maybe this is the reason, but i don't know how to debug it. i tried disabling acpi and apic via cmdline to exclude anything acpi-related. maybe you have an idea... regards Frank
