Qubes 4.0: USB keyboard stopped working / audit problem?

[peter.p...@gmail.com]

After working fine for weeks, my USB keyboard stopped working out of a sudden.

sys-usb qube dmesg says:

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[ 3545.840080] usb 1-2: new low-speed USB device number 11 using xhci_hcd
[ 3545.973689] usb 1-2: New USB device found, idVendor=413c, idProduct=2107
[ 3545.973740] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 3545.973792] usb 1-2: Product: Dell USB Entry Keyboard
[ 3545.973827] usb 1-2: Manufacturer: Dell
[ 3545.979089] input: Dell Dell USB Entry Keyboard as /devices/pci0000:00/0000:00:06.0/usb1/1-2/1-2:1.0/0003:413C:2107.0006/input/input12
[ 3546.031460] hid-generic 0003:413C:2107.0006: input,hidraw2: USB HID v1.10 Keyboard [Dell Dell USB Entry Keyboard] on usb-0000:00:06.0-2/input0
[ 3546.121637] kauditd_printk_skb: 1 callbacks suppressed
[ 3546.121639] audit: type=1130 audit(1526542465.839:130): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=qubes-input-sender-keyboard@event8 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[ 3546.209885] audit: type=1131 audit(1526542465.928:131): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=qubes-input-sender-keyboard@event8 comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=failed'

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The USB mouse still works fine.
Any idea?