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Arch + Hyprland Setup Reference

Last updated 2026-05-18. HDR set to OFF by default; toggle with Super + Ctrl + Alt + H. Machine: Arch Linux + Hyprland 0.55 + caelestia dotfiles. The install lives on a portable NVMe and roams between two hosts — desktop (NVIDIA RTX 3060 + Intel iGPU, LG Ultrawide 3440x1440@160 Hz on DP-2) and laptop (Intel Raptor Lake + RTX 4070 Mobile, BOE 16" 2560x1600@240 Hz on eDP-1). Per-host monitor config switches automatically on session start — see Display setup.

1. File layout (where things live)

Purpose Path
Caelestia upstream config (don't edit) ~/.local/share/caelestia/hypr/
Your Hyprland user overrides ~/.config/caelestia/hypr-user.conf
Your Hyprland variable overrides ~/.config/caelestia/hypr-vars.conf
Hyprland entrypoint (symlink to caelestia) ~/.config/hypr/hyprland.conf
Per-host monitor configs ~/.config/hypr/hyprland/monitors-{laptop,desktop}.conf
Active monitor symlink (flips per host) ~/.config/hypr/hyprland/monitors.conf
Host-detection script (runs on session start) ~/.config/hypr/scripts/select-monitors.sh
Fish shell config (caelestia) ~/.config/fish/config.fish
Your fish dev-env additions ~/.config/fish/conf.d/dev-env.fish
Personal scripts (in PATH) ~/.local/bin/
Robotics workspace ~/robotics/ws
ALSA state /var/lib/alsa/asound.state
DualSense audio fix /usr/local/bin/dualsense-audio-fix.sh + /etc/udev/rules.d/99-dualsense-audio.rules
HDR toggle script ~/.local/bin/hdr-toggle

Golden rule: never edit anything under ~/.local/share/caelestia/. It will be overwritten when caelestia updates. All your customisation goes in ~/.config/caelestia/hypr-user.conf (sourced LAST, so it always wins).

After editing any Hyprland config: hyprctl reload (or just save — caelestia's helper auto-reloads).

2. Where to change a setting (the "Settings app" equivalent)

Linux has no single "Settings app" the way Ubuntu/GNOME or Plasma do — but systemsettings from KDE is installed here as the closest equivalent. Launch it with systemsettings (or pin a keybind). It covers display, audio, bluetooth, theming, input, keyboard shortcuts, and most of the panels you remember from Ubuntu. Some panels assume KDE Plasma is running and won't apply on Hyprland; the table below covers what really lives where.

Configuration is owned by different layers depending on what you're changing. Use this table as a first lookup, then jump to the file or command.

I want to change... Where Notes
Hyprland — windows, monitors, keybinds, input
Keybinds, window rules, startup apps ~/.config/caelestia/hypr-user.conf sourced last — always wins; full reference: Keybinds
Monitor (resolution, refresh, scale, VRR) ~/.config/hypr/hyprland/monitors-{laptop,desktop}.conf per-host file, picked automatically; see Display setup
Inspect / arrange displays (GUI) wdisplays drag-arrange, scale, refresh, VRR toggle — see Display setup → Inspecting current state
Inspect displays (CLI, deep) drm_info full kernel DRM dump: modes, EDID, HDR/VRR caps, pixel formats
HDR / color management for DP-2 toggle with Super+Ctrl+Alt+H (script ~/.local/bin/hdr-toggle) live mode flip via hyprctl keyword monitor
Gaps, borders, rounded corners, animations ~/.config/caelestia/hypr-vars.conf general / decoration / animations blocks
Keyboard layout, repeat rate, mouse / trackpad same — input {} block
Caelestia shell — bar, launcher, theme, notifications ~/.config/caelestia/shell.json reload with Ctrl + Super + Shift + R
Wallpaper same
Audio (PipeWire / WirePlumber) pavucontrol (GUI, Ctrl + Alt + V) or wpctl (CLI) Hyprland never touches audio
Audio EQ / effects easyeffects
Network (NetworkManager) nmcli or nm-connection-editor caelestia bar applet also works
Bluetooth bluetoothctl or caelestia bar applet
Brightness brightnessctl set 50% or media keys
Sleep / power behavior /etc/systemd/logind.conf manual: Super + Shift + L
GTK theme, icons, cursor gsettings set org.gnome.desktop.interface ... also ~/.config/gtk-{3,4}.0/
Fonts install + fc-cache -f; config in ~/.config/fontconfig/
Time zone / locale sudo timedatectl set-timezone ... / sudo localectl set-locale ...
User account — password, groups passwd, sudo usermod -aG GROUP $USER re-login for group changes
Fish shell — aliases, env vars ~/.config/fish/conf.d/dev-env.fish config.fish is caelestia's — don't edit
Prompt (starship) ~/.config/starship.toml
Services / daemons systemctl [start\|stop\|enable\|disable] foo user units: add --user
Packages sudo pacman -S pkg / paru -S pkg (AUR) no GUI store by default
NVIDIA GPU nvidia-settings (GUI) overclock, fan curves, monitor info
Catch-all GUI ("Ubuntu Settings"-equivalent) systemsettings (KDE), kinfocenter (hardware/about) most panels work without full KDE; some assume Plasma and no-op on Hyprland
File manager — hidden files, view settings Dolphin: Ctrl+H toggles hidden; defaults in ~/.config/dolphinrc (GlobalViewProps=true) + ~/.local/share/dolphin/view_properties/global/.directory Nautilus also installable if you prefer the Ubuntu Files UX

2.1 Mental model

  • Hyprland owns how the desktop behaves while you use it — windows, monitors, input devices, keybinds.
  • Caelestia is the shell layered on top of Hyprland — bar, launcher, notifications, theme. Its config lives in ~/.config/caelestia/.
  • Underneath: PipeWire owns all audio. NetworkManager owns all networking. systemd owns services, boot, sleep, and power.

If a setting you're looking for isn't in hypr-user.conf / hypr-vars.conf / shell.json, it's almost certainly owned by one of those three lower layers.

2.2 "I want to..." one-liners

```bash

Add a startup app (runs once at session login)

echo 'exec-once = signal-desktop' >> ~/.config/caelestia/hypr-user.conf

Always-float a window class

echo 'windowrulev2 = float, class:^(MyApp)$' >> ~/.config/caelestia/hypr-user.conf

Switch keyboard layout (Hyprland) to UK

in hypr-vars.conf: input

Change cursor theme system-wide

gsettings set org.gnome.desktop.interface cursor-theme "Bibata-Modern-Classic"

Persist a Wi-Fi network

nmcli device wifi connect "SSID" password "..."

Find which config file a tool actually reads

strace -f -e openat foo 2>&1 | grep -i config ```

2.3 Rule of thumb for "which file?"

  • Caelestia files under ~/.local/share/caelestia/ — upstream defaults. Never edit. Will be overwritten on update.
  • Caelestia files under ~/.config/caelestia/ — your overrides. Always edit here.
  • App-specific config under ~/.config/<app>/ — owned by that app, not by Hyprland or caelestia.
  • System-wide config under /etc/ — needs sudo. Use only when no per-user equivalent exists (logind, fstab, pacman, etc.).

3. Hyprland keybind reference

Super = the Windows/Meta key.

3.1 Window focus + movement

Action Keys
Focus left / right / up / down window Super + ←/→/↑/↓
Move window left / right / up / down Super + Shift + ←/→/↑/↓
Drag-move with mouse Super + LMB drag
Drag-resize with mouse Super + RMB drag
Hide / "minimize" focused window Super + H (sends to special:minimized)
Show minimized stack Super + Shift + H

3.2 Resizing

Action Keys
Resize ±10% right/left Super + = / Super + -
Resize ±10% up/down Super + Shift + = / Super + Shift + -
Resize with arrows (±10%) Super + Alt + ←/→/↑/↓
Enter sticky resize mode Super + Ctrl + R
└ In resize mode arrows or h/j/k/l (±40 px); add Shift for ±120 px
└ Leave resize mode Esc or Enter

3.3 Maximize / fullscreen / float / pin

Action Keys
Maximize (fullscreen) Super + F
Bordered fullscreen Super + Alt + F
Toggle floating Super + Alt + Space
Pin (sticks on all workspaces) Super + P
Center window Ctrl + Super + \
Pip-resize (55%×70% centered) Ctrl + Super + Alt + \
Picture-in-picture mode Super + Alt + \
Close window Super + Q

3.4 Half-screen snaps (your additions)

Action Keys
Snap to left half Super + Ctrl + ←
Snap to right half Super + Ctrl + →
Snap to top half Super + Ctrl + ↑
Snap to bottom half Super + Ctrl + ↓

3.5 Splits / layout (dwindle)

Action Keys
Toggle split direction (V↔H) Super + Ctrl + J
Pseudo-tile toggle Super + Ctrl + P
Swap across split Super + Ctrl + O

3.6 Workspaces

Action Keys
Go to workspace N Super + 1..9, 0
Move window to workspace N Super + Alt + 1..9, 0
Next / prev workspace Ctrl + Super + → / Ctrl + Super + ←
Scroll workspaces Super + scroll wheel
Toggle special (scratchpad) Super + S
Move window to special Super + Alt + S
System monitor (special ws) Ctrl + Shift + Esc
Music (special ws) Super + M
Communication (special ws) Super + D
Todo (special ws) Super + R

3.7 Window groups (tabbed groups inside a tile)

Action Keys
Toggle group Super + ,
Cycle next/prev in group Alt + Tab / Shift + Alt + Tab
Ungroup Super + U
Lock group (no auto-merge) Super + Shift + ,

3.8 Apps

App Keys
Terminal (foot) Super + T
Browser (zen-browser) Super + W
Editor (codium) Super + C
File explorer (thunar) Super + E
Nemo file manager Super + Alt + E
GitHub Desktop Super + G
Audio mixer (pavucontrol) Ctrl + Alt + V
Process viewer (qps) Ctrl + Alt + Esc

3.9 Utilities

Action Keys
Launcher (caelestia) tap Super
Screenshot full → clipboard Print
Screenshot region (freeze) Super + Shift + S
Screenshot region Super + Shift + Alt + S
Record screen with sound Super + Alt + R
Record screen (silent) Ctrl + Alt + R
Record region Super + Shift + Alt + R
Color picker Super + Shift + C
Clipboard history Super + V
Clipboard delete entry Super + Alt + V
Emoji picker Super + .
Sidebar Super + N
Show all panels Super + K
Lock screen Super + L
Sleep / suspend-hibernate Super + Shift + L
Session menu Ctrl + Alt + Del
Clear notifications Ctrl + Alt + C
Reload caelestia shell Ctrl + Super + Shift + R

3.10 Media + volume

Action Keys
Play/pause media key or Ctrl + Super + Space
Next track media key or Ctrl + Super + =
Prev track media key or Ctrl + Super + -
Mute output mute key or Super + Shift + M
Volume up / down media keys (±10%)

3.11 HDR (your addition)

Action Keys
Toggle HDR ↔ SDR Super + Ctrl + Alt + H

4. How to edit / add keybinds

Hyprland bind syntax:

bind = MODIFIERS, KEY, DISPATCHER, ARGS # one-shot binde = MODIFIERS, KEY, DISPATCHER, ARGS # repeats while held bindl = MODIFIERS, KEY, DISPATCHER, ARGS # also fires while screen locked bindm = MODIFIERS, KEY, DISPATCHER, ARGS # mouse bind bindr = MODIFIERS, KEY, DISPATCHER, ARGS # fires on key release

MODIFIERS is +-joined: Super, Ctrl, Alt, Shift. Example: Super+Ctrl+Alt.

To add a bind: append a line to ~/.config/caelestia/hypr-user.conf, then either save (auto-reload) or run hyprctl reload.

To override a caelestia default: just rebind the same key combo in your user file — last-loaded wins.

To disable a caelestia bind: unbind = MODIFIERS, KEY.

To discover a Hyprland dispatcher: run hyprctl dispatch -h or browse https://wiki.hyprland.org/Configuring/Dispatchers/.

Quick examples to drop into hypr-user.conf:

```

Open the file manager on Super+B

bind = Super, B, exec, app2unit -- thunar

Bigger resize step (override caelestia's ±10%)

unbind = Super, Equal unbind = Super, Minus binde = Super, Equal, resizeactive, 20% 0 binde = Super, Minus, resizeactive, -20% 0 ```

Live reload + verify:

hyprctl reload hyprctl binds | grep -A3 'YourKeyHere'

5. HDR / color management

5.1 Current state

Your monitor (LG Ultrawide on DP-2) supports:

  • HDR10 (SMPTE ST2084 / PQ EOTF)
  • BT.2020 RGB + YCC color spaces
  • Peak luminance 302 nits (HDR400 tier)
  • VRR 48–160 Hz

HDR is OFF by default — the session starts in plain 8-bit sRGB. HDR is opt-in per session via the toggle bind (Super + Ctrl + Alt + H).

The default monitor line in ~/.config/hypr/hyprland/monitors-desktop.conf:

monitor = DP-2, 3440x1440@159.96, 0x0, 1, bitdepth, 10, cm, srgb, vrr, 0

Boot baseline: native resolution, 160 Hz fixed (VRR off — see Display setup → G-Sync vs. VRR), 10-bit SDR within the sRGB gamut. HDR is opt-in per session.

(Previously this lived in hypr-user.conf. It moved to a per-host file so the same SSD can boot cleanly on the laptop too — see Display setup.)

When toggled on, the HDR profile applied by ~/.local/bin/hdr-toggle is:

monitor = DP-2, 3440x1440@159.96, 0x0, 1, bitdepth, 10, cm, hdr, sdrbrightness, 1.5, sdrsaturation, 1.0

Rationale for SDR-default: most Linux apps don't produce HDR output, SDR content under HDR mode often looks dim/washed-out without tuning, and HDR + VRR can flicker. Enable HDR only when launching an HDR-aware client (mpv with --target-colorspace-hint=yes, gamescope, Steam-in-gamescope).

5.2 Monitor line syntax

monitor = NAME, RESOLUTION@RATE, POS, SCALE, [extra args]

Extra args (comma-separated key/value pairs):

Arg Values What
bitdepth 8 / 10 Output bit depth (10 needed for HDR)
cm srgb / wide / hdr / hdredid Color management preset
sdrbrightness float, typ. 1.0–2.5 Multiplier for SDR content brightness in HDR mode
sdrsaturation float, typ. 1.0 SDR saturation in HDR mode
vrr 0 / 1 / 2 VRR off / on / fullscreen-only
bitdepth, 10, cm, srgb Plain 10-bit SDR (wider color than 8-bit)
cm, wide Wide gamut without HDR
cm, hdr HDR with metadata derived from settings above
cm, hdredid HDR using the metadata reported in the monitor EDID

5.3 Toggling HDR live

The bind Super + Ctrl + Alt + H runs ~/.local/bin/hdr-toggle which flips between HDR and sRGB on-the-fly via hyprctl keyword monitor. No reload required. Since SDR is the boot default, the first press of this bind enables HDR for the session; the second press returns to SDR.

The script:

```bash

!/usr/bin/env bash

set -euo pipefail state=$(hyprctl monitors -j | jq -r '.[] | select(.name=="DP-2") | .colorManagementPreset') case "$state" in srgb|unknown) hyprctl keyword monitor "DP-2, 3440x1440@159.96, 0x0, 1, bitdepth, 10, cm, hdr, sdrbrightness, 1.5, sdrsaturation, 1.0" notify-send -i video-display "HDR enabled" "HDR10 / BT.2020" ;; *) hyprctl keyword monitor "DP-2, 3440x1440@159.96, 0x0, 1, bitdepth, 10, cm, srgb, vrr, 0" notify-send -i video-display "HDR disabled" "sRGB / 10-bit / 160 Hz fixed" ;; esac ```

5.4 Verifying HDR is on

hyprctl monitors -j | jq '.[] | {name, colorManagementPreset, currentFormat}'

  • colorManagementPreset: "hdr" and currentFormat: "XBGR2101010" → HDR active.
  • colorManagementPreset: "srgb" and currentFormat: "XBGR2101010" → 10-bit SDR (the default).
  • colorManagementPreset: "srgb" and currentFormat: "XRGB8888" → 8-bit SDR (laptop, or pre-update desktop).

5.5 Caveats

  • Most Linux apps don't produce HDR output. Working HDR clients today: mpv (--target-colorspace-hint=yes), gamescope-wrapped games, Steam in gamescope mode.
  • If SDR content looks dim under HDR, raise sdrbrightness (try 1.8 then 2.0).
  • HDR + VRR sometimes causes flicker on certain monitors. Disable VRR (vrr, 0) if you see it.
  • Browser HDR (Netflix/YouTube HDR) is hit-or-miss on Linux even now.

5.6 Persisting tweaks

If you decide you like sdrbrightness, 1.8, just edit the monitor = line in ~/.config/hypr/hyprland/monitors-desktop.conf to make it permanent across reboots. The toggle script's "HDR ON" branch will still use the values hard-coded in the script — update those to match if you tweak.

6. Installed software

6.1 Dev toolchain

  • Compilers/build: gcc 16, clang 22, cmake, ninja, meson, ccache, make, pkgconf
  • Debug/profile: gdb, lldb, valgrind, cppcheck, doxygen, graphviz
  • C++ libs: boost, eigen, tbb, openssl
  • CUDA 13.2 at /opt/cuda (path in /etc/profile.d/cuda.sh)
  • cuDNN 9.22

6.2 Python (3.14.5)

pip, pipx, virtualenv, numpy, scipy, pandas, scikit-learn, matplotlib, h5py, jupyterlab, ipython, pytest, mypy, ruff, pylint, black.

6.3 Node.js (26.1) + JS toolchain

npm 11, pnpm 10, yarn classic.

6.4 Editors

  • VS Code (MS official build) — binary code. Extensions: Python, Pylance, C++, CMake Tools, ROS, Docker, YAML, Ruff, Jupyter.
  • Neovim 0.12 with LazyVim starter at ~/.config/nvim.
  • Zed — binary is zeditor on Arch (zed is taken by something else). Fish abbr zed aliases to zeditor.

6.5 Containers / robotics

  • Docker 29.5 with NVIDIA runtime. You're in the docker group.
  • ROS 2 Jazzy via Docker image osrf/ros:jazzy-desktop-full (6.35 GB).
  • Launcher: ros2-jazzy (subcommands shell, run "...", attach, stop, pull).
  • Workspace: ~/robotics/ws mounted as /root/ws in the container.

6.6 Audio / DualSense

  • PipeWire + WirePlumber.
  • DualSense udev rule fixes the hardware PCM Playback Volume = 0 bug automatically on plug-in.

6.7 GPU / gaming

  • NVIDIA driver 595.71 (nvidia-open), 12 GB RTX 3060.
  • gamemode + lib32-gamemode (CPU governor boost while gaming).
  • mangohud + lib32-mangohud (FPS / GPU overlay — enable per app with env MANGOHUD=1 or as a Steam launch option).

6.8 Multimedia

  • mpv (video), haruna (Qt video frontend), easyeffects (PipeWire EQ/effects), pavucontrol (audio mixer), obs-studio (recording/streaming), gimp/inkscape (if installed), okular (PDF), gwenview/swayimg (image).

6.9 Embedded / robotics CLI

  • picocom + minicom (serial terminals — talk to /dev/ttyUSB0, etc.)
  • arduino-cli
  • stlink (STM32 flashing)
  • openocd (JTAG/SWD)
  • wireshark-qt (network protocol analysis; ROS DDS debugging)

6.10 Terminal productivity

fish (shell, with caelestia config), starship (prompt), fzf, ripgrep (rg), fd, bat, eza, zoxide (cd replacement), lazygit (lg), gh (GitHub CLI), tmux, tree, jq, yq.

7. Common commands cheat-sheet

7.1 Package management

bash sudo pacman -Syu # update everything sudo pacman -S pkg # install from official repos sudo pacman -Rns pkg # remove + unused deps + config paru -S pkg # install from AUR (or repos) paru -Sua # update AUR packages only pacman -Qq | grep foo # search installed pacman -Qi pkg # info on installed package pacman -Qdt # orphaned dependencies

Checking if a package is installed (e.g. cuDNN)

bash pacman -Qs cudnn # query INSTALLED — empty output = not installed pacman -Qi cudnn # full info (version, install date); exits non-zero if absent pacman -Ss cudnn # search REMOTE repos (like `apt search`) pacman -Ql cudnn # list files the package owns ldconfig -p | grep libcudnn # verify the shared library is actually linkable

AUR packages installed via paru/yay still register with pacman, so pacman -Qs finds them too.

apt → pacman cheat sheet

Ubuntu / Debian Arch
apt search foo \| grep installed pacman -Qs foo
apt list --installed pacman -Q
apt search foo (remote) pacman -Ss foo
apt show foo pacman -Si foo (remote) / pacman -Qi foo (installed)
dpkg -L foo pacman -Ql foo
dpkg -S /path/to/file pacman -Qo /path/to/file
apt update && apt upgrade sudo pacman -Syu
apt install foo sudo pacman -S foo
apt remove foo sudo pacman -Rns foo
apt autoremove sudo pacman -Rns $(pacman -Qdtq)

7.2 Hyprland

bash hyprctl monitors # info on all monitors hyprctl clients # all open windows hyprctl binds # all active keybinds (lots of output) hyprctl reload # reload config hyprctl keyword KEY VALUE # set a config value live hyprctl dispatch KEY ARG # invoke a dispatcher (same as a bind would) hyprctl version

7.3 Audio

bash wpctl status # tree view of audio devices/streams wpctl set-volume @DEFAULT_AUDIO_SINK@ 0.5 # set default sink volume to 50% wpctl set-mute @DEFAULT_AUDIO_SINK@ toggle # toggle mute pactl list short sinks # one-line list pactl set-default-sink SINK_NAME # change default pavucontrol # GUI mixer amixer -c N contents # raw ALSA controls for card N amixer -c N cset numid=N VALUE # set a raw control

7.4 ROS 2 Jazzy via Docker

bash ros2-jazzy # open interactive ROS shell ros2-jazzy run "ros2 topic list" # one-off command ros2-jazzy attach # attach to existing container ros2-jazzy stop # kill the container ros2-jazzy pull # pull latest image

Inside the container, your host ~/robotics/ws is at /root/ws. GPU is passed through. X11 + Wayland sockets are forwarded so rviz2, rqt, gz sim all open windows on your desktop.

7.5 Docker

bash docker ps # running containers docker ps -a # all containers docker images # local images docker logs -f NAME # follow logs docker exec -it NAME bash # shell into a running container docker system prune # reclaim space (careful)

7.6 Serial / microcontroller

bash picocom -b 115200 /dev/ttyUSB0 # serial term at 115200 baud (Ctrl-A Ctrl-X to quit) minicom -D /dev/ttyACM0 -b 115200 # alternative arduino-cli board list # find connected boards arduino-cli compile --fqbn FQBN sketch.ino arduino-cli upload --fqbn FQBN -p /dev/ttyUSB0 sketch.ino st-info --probe # STM32 board info st-flash write fw.bin 0x8000000 # flash STM32

7.7 Git (your defaults)

Already configured globally: init.defaultBranch=main, push.autoSetupRemote=true, pull.rebase=false, fetch.prune=true, rerere.enabled=true, core.editor=nvim.

Identity still needs setting:

bash git config --global user.name "Your Name" git config --global user.email "you@example.com"

8. Troubleshooting recipes

8.1 DualSense audio silent again

```bash

Check current state

CARD=$(awk '/DualSense Wireless Controller/{n=$1;gsub(/[^0-9]/,"",n);print n;exit}' /proc/asound/cards) amixer -c $CARD cget numid=4 # should report values=100

Manual fix

amixer -c $CARD cset numid=4 100

If the udev rule isn't firing

sudo udevadm test $(udevadm info -q path /dev/snd/controlC$CARD) 2>&1 | tail ```

8.2 Hyprland config change broke things

Hyprland keeps a log at ~/.local/share/hyprland/hyprland.log (or run hyprctl logs). If a bad keybind crashes reload, edit ~/.config/caelestia/hypr-user.conf from a TTY (Ctrl+Alt+F2) and re-launch.

8.3 No GPU in Docker

```bash sudo docker run --rm --gpus all nvidia/cuda:12.6.0-base-ubuntu22.04 nvidia-smi

If it errors:

sudo nvidia-ctk runtime configure --runtime=docker sudo systemctl restart docker ```

8.4 Need to talk to /dev/ttyUSB0 but get permission denied

You should be in the uucp group (Arch's convention for serial devices). Check with groups. If missing:

```bash sudo usermod -aG uucp,lock $USER

Then log out and back in.

```

8.5 Wireshark says "you need to be in wireshark group"

bash sudo usermod -aG wireshark $USER newgrp wireshark # apply to current shell, or just log out/in

8.6 HDR looks washed out / colors wrong

Try in order:

  1. Bump sdrbrightness, 1.8 (or 2.0) in the monitor line, reload.
  2. Swap cm, hdr → cm, hdredid (let monitor declare its own HDR metadata).
  3. If still bad, just toggle off with Super + Ctrl + Alt + H and only enable HDR for mpv / gamescope sessions.

8.7 Gazebo natively (gz-harmonic) won't build

The AUR gz-harmonic package currently fails on gcc 16 because of ogre-next2, fcl, libccd, octomap. Use Gazebo via the ROS 2 Jazzy Docker image instead (ros2-jazzy → gz sim ...). Re-check in a few months once AUR maintainers patch.

9. Useful URLs

10. Where things came from

Setup performed by Claude on 2026-05-17. Memory entries describing decisions live at ~/.claude/projects/-home-gamingsoul03/memory/. Update or delete this file freely — it's yours.