Hello gouchi. Thank you very much for your help. I did as you said, but I see no “input” block for this controller. I am not sure Lakka (or my linux laptop) even recognizes it as an input device.
Here is the entire output of the cat command, but I’m not sure if it will be useful to you.
Lakka:~ # cat /proc/bus/input/devices
I: Bus=0019 Vendor=0000 Product=0001 Version=0000
N: Name="Power Button"
P: Phys=PNP0C0C/button/input0
S: Sysfs=/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0C0C:00/input/input0
U: Uniq=
H: Handlers=kbd event0
B: PROP=0
B: EV=3
B: KEY=10000000000000 0
I: Bus=0019 Vendor=0000 Product=0001 Version=0000
N: Name="Power Button"
P: Phys=LNXPWRBN/button/input0
S: Sysfs=/devices/LNXSYSTM:00/LNXPWRBN:00/input/input1
U: Uniq=
H: Handlers=kbd event1
B: PROP=0
B: EV=3
B: KEY=10000000000000 0
I: Bus=0019 Vendor=0000 Product=0006 Version=0000
N: Name="Video Bus"
P: Phys=LNXVIDEO/video/input0
S: Sysfs=/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input2
U: Uniq=
H: Handlers=kbd event2
B: PROP=0
B: EV=3
B: KEY=3e000b00000000 0 0 0
I: Bus=0003 Vendor=046d Product=4024 Version=0111
N: Name="Logitech K400"
P: Phys=usb-0000:00:14.0-3:1
S: Sysfs=/devices/pci0000:00/0000:00:14.0/usb2/2-3/2-3:1.2/0003:046D:C52B.0003/0003:046D:4024.0004/input/input3
U: Uniq=
H: Handlers=sysrq kbd leds mouse0 event3
B: PROP=0
B: EV=12001f
B: KEY=3007f 0 0 483ffff17aff32d bf54444600000000 ffff0001 130f938b17c007 ffff7bfad9415fff febeffdfffefffff fffffffffffffffe
B: REL=1c3
B: ABS=100000000
B: MSC=10
B: LED=1f
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="HDA Intel HDMI HDMI/DP,pcm=3"
P: Phys=ALSA
S: Sysfs=/devices/pci0000:00/0000:00:03.0/sound/card0/input4
U: Uniq=
H: Handlers=event4
B: PROP=0
B: EV=21
B: SW=140
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="HDA Intel HDMI HDMI/DP,pcm=7"
P: Phys=ALSA
S: Sysfs=/devices/pci0000:00/0000:00:03.0/sound/card0/input5
U: Uniq=
H: Handlers=event5
B: PROP=0
B: EV=21
B: SW=140
I: Bus=0001 Vendor=10ec Product=0283 Version=0001
N: Name="HDA Digital PCBeep"
P: Phys=card1/codec#0/beep0
S: Sysfs=/devices/pci0000:00/0000:00:1b.0/sound/card1/input6
U: Uniq=
H: Handlers=kbd event6
B: PROP=0
B: EV=40001
B: SND=6
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="HDA Intel PCH Mic"
P: Phys=ALSA
S: Sysfs=/devices/pci0000:00/0000:00:1b.0/sound/card1/input7
U: Uniq=
H: Handlers=event7
B: PROP=0
B: EV=21
B: SW=10
I: Bus=0000 Vendor=0000 Product=0000 Version=0000
N: Name="HDA Intel PCH Headphone"
P: Phys=ALSA
S: Sysfs=/devices/pci0000:00/0000:00:1b.0/sound/card1/input8
U: Uniq=
H: Handlers=event8
B: PROP=0
B: EV=21
B: SW=4
I: Bus=0019 Vendor=1050 Product=00c3 Version=0033
N: Name="Nuvoton w836x7hg Infrared Remote Transceiver"
P: Phys=nuvoton/cir0
S: Sysfs=/devices/pnp0/00:05/rc/rc0/input9
U: Uniq=
H: Handlers=kbd event9
B: PROP=0
B: EV=100013
B: KEY=fff 0 200108fc32e 237605100000000 0 700158000 419200004001 8e968000000000 10000000
B: MSC=10
Please let me know if you have any further suggestions. Thank you again.