I had to temporarily replace my mouse with a different one, and because the new one only has two buttons, I was messing around to make it more comfortable.
In XFCE's Mouse and Touchpad settings, four devices were listed. My old mouse, twice. My new mouse, once. And a device named "USB usb keyboard Consumer Control". While I was trying to setup the new mouse, and troubleshooting what's wrong with the old, I switched the usb keyboard off from those settings, and the media keys (XF86) were all gone; not registering any input in anything else than showkey. No xev, no remapping them from inside the Keyboard settings, nothing.
If you ever come across a similar issue, take a look at your mouse settings and how they interact with your keyboard.
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System: Host: <filter> Kernel: 5.10.0-9-amd64 x86_64 bits: 64 compiler: N/A
parameters: BOOT_IMAGE=/boot/vmlinuz-5.10.0-9-amd64
root=UUID=<filter> ro quiet splash
Desktop: Xfce 4.16.0 tk: Gtk 3.24.24 info: xfce4-panel wm: xfwm4 dm: LightDM 1.26.0
Distro: MX-21_x64 Wildflower October 20 2021 base: Debian GNU/Linux 11 (bullseye)
Machine: Type: Laptop Mobo: INTEL model: CRESCENTBAY serial: <filter>
UEFI [Legacy]: American Megatrends v: 5.6.5 date: 09/22/2015
Battery: Device-1: hidpp_battery_4 model: Logitech Touch Mouse T620 serial: <filter>
charge: 55% (should be ignored) rechargeable: yes status: Discharging
CPU: Topology: Dual Core model: Intel Core i7-5550U bits: 64 type: MT MCP arch: Broadwell
family: 6 model-id: 3D (61) stepping: 4 microcode: 2F L2 cache: 4096 KiB
flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 15961
Speed: 928 MHz min/max: 500/3000 MHz Core speeds (MHz): 1: 1046 2: 1085 3: 1056
4: 1065
Vulnerabilities: Type: itlb_multihit status: KVM: VMX disabled
Type: l1tf mitigation: PTE Inversion; VMX: conditional cache flushes, SMT vulnerable
Type: mds mitigation: Clear CPU buffers; SMT vulnerable
Type: meltdown mitigation: PTI
Type: spec_store_bypass
mitigation: Speculative Store Bypass disabled via prctl and seccomp
Type: spectre_v1 mitigation: usercopy/swapgs barriers and __user pointer sanitization
Type: spectre_v2 mitigation: Full generic retpoline, IBPB: conditional, IBRS_FW,
STIBP: conditional, RSB filling
Type: srbds mitigation: Microcode
Type: tsx_async_abort status: Not affected
Graphics: Device-1: Intel HD Graphics 6000 driver: i915 v: kernel bus ID: 00:02.0
chip ID: 8086:1626
Display: x11 server: X.Org 1.20.11 driver: modesetting unloaded: fbdev,vesa
compositor: compton v: 1 resolution: 1920x1080~60Hz
OpenGL: renderer: Mesa Intel HD Graphics 6000 (BDW GT3) v: 4.6 Mesa 20.3.5
direct render: Yes
Audio: Device-1: Intel Broadwell-U Audio driver: snd_hda_intel v: kernel bus ID: 00:03.0
chip ID: 8086:160c
Device-2: Intel Wildcat Point-LP High Definition Audio driver: snd_hda_intel
v: kernel bus ID: 00:1b.0 chip ID: 8086:9ca0
Device-3: Tenx USB AUDIO type: USB driver: hid-generic,snd-usb-audio,usbhid
bus ID: 1-3:3 chip ID: 1130:1620
Sound Server: ALSA v: k5.10.0-9-amd64
Network: Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet driver: r8169
v: kernel port: e000 bus ID: 02:00.0 chip ID: 10ec:8168
IF: eth0 state: up speed: 1000 Mbps duplex: full mac: <filter>
Device-2: Ralink RT3090 Wireless 802.11n 1T/1R PCIe vendor: AzureWave
driver: rt2800pci v: 2.3.0 port: e000 bus ID: 03:00.0 chip ID: 1814:3090
IF: wlan0 state: down mac: <filter>
Drives: Local Storage: total: 1.82 TiB used: 833.18 GiB (44.7%)
ID-1: /dev/sda vendor: Seagate model: ST1000LX015-1U7172 size: 931.51 GiB block size:
physical: 4096 B logical: 512 B speed: 6.0 Gb/s rotation: 5400 rpm serial: <filter>
rev: SDM1 temp: 39 C scheme: GPT
ID-2: /dev/sdb type: USB vendor: HGST (Hitachi) model: HTS 541010B7E610
size: 931.51 GiB block size: physical: 4096 B logical: 512 B serial: <filter>
rev: 0204 scheme: GPT
Partition: ID-1: / raw size: 128.00 GiB size: 124.93 GiB (97.60%) used: 20.13 GiB (16.1%)
fs: ext4 dev: /dev/sda4
ID-2: /home raw size: 480.50 GiB size: 471.96 GiB (98.22%) used: 229.70 GiB (48.7%)
fs: ext4 dev: /dev/sda6
ID-3: swap-1 size: 26.01 GiB used: 3.8 MiB (0.0%) fs: swap
swappiness: 15 (default 60) cache pressure: 100 (default) dev: /dev/sda2
Sensors: System Temperatures: cpu: 51.0 C mobo: N/A
Fan Speeds (RPM): N/A
Repos: No active apt repos in: /etc/apt/sources.list
Active apt repos in: /etc/apt/sources.list.d/debian-stable-updates.list
1: deb http://deb.debian.org/debian bullseye-updates main contrib non-free
Active apt repos in: /etc/apt/sources.list.d/debian.list
1: deb http://deb.debian.org/debian bullseye main contrib non-free
2: deb http://security.debian.org/debian-security bullseye-security main contrib non-free
Active apt repos in: /etc/apt/sources.list.d/mx.list
1: deb http://ftp.cc.uoc.gr/mirrors/linux/mx/mx/repo/ bullseye main non-free
Info: Processes: 219 Uptime: 10h 38m Memory: 7.68 GiB used: 1.75 GiB (22.8%) Init: SysVinit
v: 2.96 runlevel: 5 default: 5 Compilers: gcc: 10.2.1 alt: 10 Shell: quick-system-in
running in: quick-system-in inxi: 3.0.36