New TrueOS install; keyboard doesn't work right

I installed a new instance of TrueOS (a FreeBSD variant) yesterday, and had a USB keyboard plugged in (Logitech G510). It worked fine in the install env, during the first-boot setup, and up until the new instance rebooted. At this point, it seems like it's stopped sending input entirely, starting from when it's recognized during BSD's boot-time module loading phase, because that's when Scroll Lock stops working. However, the LCD screen and backlights are on, and if I plug another keyboard in it tracks status changes (Caps/NumLock, etc.) and it works fine in Windows/Linux and on my laptop. I've tried various combinations of turning on/off Legacy USB and Hand-off in the BIOS, and using different ports, all to no avail. A different USB keyboard ("vendor 0x1241 USB Keyboard" in the logs below) works fine either way. The USB mouse has always worked. There is no PS/2 port. Any idea what's going on here, and how to fix it? Thanks! % dmesg | grep kb kbd1 at kbdmux0 atkbdc0: at port 0x60,0x64 on isa0 atkbd0: irq 1 on atkbdc0 kbd0 at atkbd0 atkbd0: [GIANT-LOCKED] ukbd0 on uhub5 ukbd0: on usbus6 kbd2 at ukbd0 ukbd1 on uhub0 ukbd1: on usbus0 kbd3 at ukbd1 % ll /dev/*kb* crw------- 1 root wheel 0x47 Oct 31 10:46 /dev/atkbd0 lrwxr-xr-x 1 root wheel 6 Oct 31 10:46 /dev/kbd0 -> atkbd0 lrwxr-xr-x 1 root wheel 7 Oct 31 10:46 /dev/kbd1 -> kbdmux0 lrwxr-xr-x 1 root wheel 5 Oct 31 10:46 /dev/kbd2 -> ukbd0 lrwxr-xr-x 1 root wheel 5 Oct 31 10:46 /dev/kbd3 -> ukbd1 crw------- 1 root wheel 0x25 Oct 31 10:46 /dev/kbdmux0 crw------- 1 root wheel 0x62 Oct 31 10:46 /dev/ukbd0 crw------- 1 root wheel 0x6a Oct 31 10:46 /dev/ukbd1