X27-Linux

Custom Fedora Kinoite 44, built with BlueBuild.

• Base: ghcr.io/gamerx27/x27-linux — recipe.yml
• LTS kernel: ghcr.io/gamerx27/x27-linux-lts — recipe-lts.yml
• Gaming: ghcr.io/gamerx27/x27-linux-gaming — recipe-gaming.yml, built on Base
• Desktop: ghcr.io/gamerx27/x27-linux-desktop — recipe-desktop.yml, built on Base
• Media PC: ghcr.io/gamerx27/x27-linux-media-pc — recipe-media-pc.yml, built on LTS kernel

Base and LTS build first; Gaming, Desktop, and Media PC build on top of them once they finish.

What's in it

• Brave (default browser), debranded with X-Linuxtool
• Removed: Firefox, KHelpCenter, Discover
• Dark theme, Papirus icons, Fish shell, Konsole terminal, fastfetch banner
• fastfetch, htop, nvtop, nano, pciutils, lm_sensors, topgrade
• Bazaar replacing Discover, as an RPM from ublue-os/packages like Bazzite. Its apps show up in KRunner (krunner-bazaar)
• VLC (Flatpak). The ISO carries it and installs it offline; rebased systems get it on first boot
• Kate, KWrite, Filelight, KCharSelect, KFind, and EasyEffects as Flatpaks instead of RPMs, installed on first boot
• Full codecs (ffmpeg, x264/x265, fdk-aac) and hardware video decode/encode on AMD and Intel (Mesa VA-API/Vulkan with H.264/HEVC/AV1, Intel media driver), from the negativo17 multimedia packages in the BlueBuild base image. Check with vainfo
• Brave, Dolphin, Konsole, and Bazaar pinned to the taskbar (new accounts only)
• Hot corners and the shake-to-locate-cursor effect disabled (new accounts only)
• CachyOS kernel (BORE scheduler); LTS variant published separately
• CachyOS tuning: sysctl, zram, I/O schedulers, ntsync, sched-ext schedulers (see CachyOS tuning)
• dnf disabled on the installed system (see Installing software)
• Auto-updates off — update manually with topgrade (Gaming and Media PC update themselves, see Auto-updates)
• /etc/os-release names the image and build, e.g. X27-Linux 44 Gaming (2026-09-22)

Install

Fresh machine: you can get the ISO file on archive.org. For the other images, run the build-iso workflow (Actions → build-iso → Run workflow), pick the image, and download the ISO from the run's artifacts, or build it locally.

Already on Fedora Kinoite: rebase onto this image.

sudo rpm-ostree rebase ostree-unverified-registry:ghcr.io/gamerx27/x27-linux:44
systemctl reboot

Then switch to verified pulls:

sudo rpm-ostree rebase ostree-image-signed:docker://ghcr.io/gamerx27/x27-linux:44
systemctl reboot

Swap x27-linux for x27-linux-lts (LTS kernel), x27-linux-gaming (Steam/gaming, see below), x27-linux-desktop (daily use, see below), or x27-linux-media-pc (media center, see below) in the commands above.

Image tags

• :44 — follows Fedora 44, rebuilt weekly. Use this one.
• :<date>-44 (e.g. :20260922-44) — one fixed build, for rolling back.
• :latest — the newest build, whatever Fedora version that is.

Installing software

dnf is disabled on the installed system: the image is read-only and replaced on every update, so anything installed with it wouldn't stick.

• Apps: Bazaar
• CLI and dev tools: distrobox create && distrobox enter, then use dnf inside the container
• System packages: sudo rpm-ostree install <package>, then reboot
• Updates: topgrade

Update

topgrade

Updates the system image, Flatpaks, and everything else in one command. Nothing updates on its own — you always run this yourself. Gaming and Media PC are the exception:

Auto-updates

Gaming and Media PC download new image builds in the background (rpm-ostreed-automatic.timer, policy stage) and switch to them on the next reboot; they never reboot by themselves. System Flatpaks update daily (x27-flatpak-update.timer). There's no weekly topgrade reminder on these two. To turn it off:

sudo systemctl disable --now rpm-ostreed-automatic.timer x27-flatpak-update.timer

First login after rebasing

Theme, icons, shell, and the hot-corners/shake-cursor settings only apply to new accounts. Run once as yourself, no sudo:

plasma-apply-lookandfeel -a org.kde.breezedark.desktop
chsh -s /usr/bin/fish "$USER"
kquitapp6 plasmashell; kstart plasmashell >/dev/null 2>&1 &

plasma-apply-lookandfeel now brings Papirus-Dark icons with it (our org.kde.breezedark.desktop package overrides the upstream defaults, which otherwise apply breeze-dark).

Log out and back in afterward for the shell change to take effect.

Remove leftover Anaconda KDE games if you have them:

sudo flatpak remove --noninteractive org.kde.elisa org.kde.kmahjongg org.kde.kolourpaint org.kde.kmines
sudo flatpak remote-modify --disable fedora fedora-testing

Kernel

x27-linux and x27-linux-gaming ship the CachyOS kernel (BORE scheduler); x27-linux-lts and x27-linux-media-pc ship its LTS variant instead. All replace the stock Fedora kernel.

• Needs an x86_64-v3 CPU (Zen-family AMD, Haswell+ Intel). Older CPUs won't boot it. Check with: /lib64/ld-linux-x86-64.so.2 --help | grep "(supported, searched)"
• Unsigned. Turn off Secure Boot, or sign it yourself with sbsigntools/mokutil (both included).

CachyOS tuning

All images include packages from the kernel-cachyos-addons COPR:

• cachyos-settings: CachyOS sysctl, zram (zstd, sized to RAM), udev I/O scheduler rules, ntsync, and the game-performance, zink-run, and kerver commands
• scx-scheds and scx-tools: sched-ext schedulers, scxctl, scxtui

On all images except gaming, no sched-ext scheduler runs by default; BORE from the kernel handles scheduling. To try one:

sudo systemctl start scx_loader
scxctl start -s scx_bpfland

To load one on every boot, set default_sched in /etc/scx_loader/config.toml and run sudo systemctl enable --now scx_loader.

Gaming variant

Everything above, plus:

• Steam, GameMode, Gamescope, MangoHud, GOverlay
• Faugus Launcher, Heroic Games Launcher (latest GitHub release, updated with each weekly build)
• Full GStreamer codecs (bad, ugly, openh264) on top of the base image's codecs, and 32-bit Mesa/libva matching the 64-bit drivers, all from negativo17
• Desktop animations off (animation speed set to Instant)
• proton-cachyos-install — run it yourself to install or update Proton-CachyOS into Steam
• Steam, Dolphin, Konsole, Brave, and Bazaar pinned to the taskbar (new accounts only)
• scx_lavd sched-ext scheduler in Gaming mode, running by default. Switch with scx-manager or scxctl switch -s <scheduler>; turn it off with sudo systemctl disable --now scx_loader
• ananicy-cpp with CachyOS rules. If games stutter, try turning this off first: sudo systemctl disable --now ananicy-cpp
• power-profiles-daemon instead of tuned-ppd, so game-performance works. In Steam, set a game's launch options to game-performance %command% to use the performance power profile while it runs
• Updates itself, see Auto-updates

Desktop variant

Everything in the base image, plus:

• Zed editor (native, not Flatpak, so its terminal and agents run on the host; updated with each weekly build). Its own updater and the sign-in button are off
• Docker, with docker.service enabled. Add yourself to the docker group once, then log out and back in: sudo usermod -aG docker $USER
• Netbird client and tray app, with netbird.service enabled
• GNOME Disks
• Flatpaks: Vivaldi, LibreWolf, Chromium, Tor Browser Launcher, Nextcloud, Cryptomator, Bitwarden, LocalSend, SyncThingy, Jellyfin Desktop, Finamp, Iotas, sshPilot, Web App Hub, Mission Center, Gwenview

Media PC variant

Everything in the base image, plus:

• LTS kernel (see above)
• Jellyfin Desktop and Finamp (Flatpak) for media playback
• LocalSend (Flatpak) for quick file transfers
• Dolphin, Jellyfin Desktop, VLC, Finamp, and Bazaar pinned to the taskbar (new accounts only)
• Updates itself, see Auto-updates

Build

Pushes to main build and publish automatically via GitHub Actions, which also rebuilds weekly to pick up upstream Kinoite/Brave/kernel updates. CI runs on GitHub only; Actions is turned off on the Forgejo mirror (git.xlabsx27.com).

Releases

Every image build publishes a GitHub Release that lists what changed: key versions (kernels, Plasma, Mesa, Brave, ...), repo commits, and the packages updated, added or removed in each image. The package lists are attached to each release.

• vYYYY.MM.DD (e.g. v2026.09.27): the weekly rebuild
• vYYYY.MM.DD.N (e.g. v2026.09.24.1): minor releases for changes pushed in between

Build ISO locally

Generates an installer ISO from the already-published ghcr.io/gamerx27 image, the same approach as the CI iso.yml workflow — nothing is built from local recipes, so this needs a network connection to GHCR.

Prerequisites:

• docker
• sudo access
• ~20GB free disk (image pull + ISO — past ISOs have run ~6.5GB)
• x86_64-v3 CPU to boot the resulting image (see Kernel above)

./scripts/build-iso.sh [--usb] [--tag TAG] [base|lts|gaming|desktop|media-pc]

Defaults to base if no argument is given. Runs build-container-installer v1.5.0 in docker. Output goes to iso-out/ at the repo root: <name>.iso and <name>.iso.sha256sum. The image pulled from GHCR is removed again when the script exits, unless it was already on the system.

Each run first empties iso-out/, removing the ISOs of every image, not just the one being built.

--tag picks the image tag the ISO installs, and the installed system keeps following it on updates: 44, latest, or a dated tag (see Image tags). Without it the script asks, defaulting to 44. The build-iso workflow has the same choice.

--usb writes the ISO to a USB drive after the build: it lists the USB drives, asks which one to use, has you type the device path (e.g. /dev/sdb) to confirm, and writes the ISO with dd. Everything on the drive is erased.