RedBear-OS/local/docs/DESKTOP-STACK-CURRENT-STATUS.md

Red Bear OS Desktop Stack — Current Status

Last updated: 2026-04-25 Canonical plan: local/docs/CONSOLE-TO-KDE-DESKTOP-PLAN.md (v2.0)

Recent Changes (2026-04-25, Wave 2)

• relibc patches now 35 total (was 33). Two new patches:

  • P3-fenv.patch: 10 FP environment functions with x86_64 SSE/x87 inline asm
  • P3-sched.patch: 6 scheduler functions with Redox defaults

• IOMMU daemon improvements:

  • UNASSIGN_DEVICE bug fixed: now properly clears DTE and submits INVALIDATE_DEVTAB_ENTRY + INVALIDATE_INTERRUPT_TABLE commands
  • TRANSLATE opcode (0x0012) added for IOVA-to-physical address resolution
  • Proper fstat for all handle kinds (Root=DIR, Control/Domain/Device=FILE)
  • Recipe #TODO removed

• Build system: repo.rs dead code cleanup — mouse events, unused fields/imports removed (~50 lines)

Purpose

This document is the current build/runtime truth summary for the Red Bear desktop stack.

Its job is to answer:

• what the desktop stack actually builds,
• what the tracked profiles currently expose,
• what is only build-visible,
• what is runtime-proven,
• and what still blocks a trustworthy Wayland/KDE session claim.

For the execution plan (phases, timelines, acceptance criteria), see the canonical plan above. For subsystem planning detail, see local/docs/WAYLAND-IMPLEMENTATION-PLAN.md; for historical KDE rationale, see docs/05-KDE-PLASMA-ON-REDOX.md.

Where We Are in the Plan

The canonical desktop plan uses a three-track model:

• Track A (Phase 1–2): Runtime Substrate → Software Compositor — Phase 1 test coverage is substantially complete (300+ unit tests across all Phase 1 daemons); runtime validation in a live environment remains the exit gate
• Track B (Phase 3–4): KWin Session → KDE Plasma — blocked on Track A
• Track C (Phase 5): Hardware GPU — can start after Phase 1

Current position: Build-side gates are crossed. Phase 1 (Runtime Substrate Validation) is still the next broad desktop target, but the repo now also carries an experimental Red Bear-native greeter/auth/session-launch stack on the redbear-full desktop path.

Active Target Surface and Evidence Boundary

• The supported compile targets are redbear-mini, redbear-full, and redbear-grub.
• Desktop/graphics are available only on redbear-full.
• Older names such as redbear-kde, redbear-wayland, redbear-minimal*, redbear-live-mini, and redbear-live-full still appear in historical or staging material, but they are not the supported compile-target surface.
• The greeter/login path is currently an experimental build/integration surface on redbear-full; it is not yet a runtime-validated end-to-end desktop-login claim.

Status Matrix

Area	Evidence class	Detail
libwayland	builds	relibc/Wayland-facing compatibility is materially stronger; 33 patches verified (was 25): signalfd, timerfd, eventfd, pthread_yield, secure_getenv, getentropy, dup3, vfork, clock_nanosleep, named-semaphores, tls-get-addr-panic-fix, fcntl-dupfd-cloexec, ipc-tests, socket-flags, syscall-0.7.4-procschemeattrs-ens-to-prio, sysv-ipc, sysv-sem-impl, sysv-shm-impl, waitid-header, open_memstream, F_DUPFD_CLOEXEC, MSG_NOSIGNAL, waitid, RLIMIT, eth0 networking, shm_open, sem_open, select-not-epoll-timeout, exec-root-bypass, tcp-nodelay, netdb-lookup-retry-fix, eventfd-mod, fd-event-tests, ifaddrs-net_if, signalfd-header, elf64-types, socket-cred, strtold-cpp-linkage, semaphore-fixes
Qt6 core stack	builds	qtbase (7 libs + 12 plugins), qtdeclarative, qtsvg, qtwayland; Qt6Quick/JIT not runtime-proven
KF6 frameworks	builds	All 32/32; some higher-level pieces use bounded/reduced recipes (kf6-kio heavy shim, kirigami stub-only)
KWin	experimental	Recipe exists; current reduced path now links honest libudev.so and libdisplay-info.so provider paths alongside real libepoxy and lcms2; 11 feature switches remain disabled and runtime/session proof is still missing
plasma-workspace	experimental	Recipe exists; stub deps (kf6-knewstuff, kf6-kwallet) unresolved
plasma-desktop	experimental	Recipe exists; depends on plasma-workspace
Mesa EGL+GBM+GLES2	builds	Software path via LLVMpipe proven in QEMU; hardware path not proven
libdrm amdgpu	builds	Package-level success only
Input stack	builds, enumerates	evdevd (65 tests), libevdev, libinput, seatd present; evdevd registers scheme at boot; end-to-end compositor input path unproven
D-Bus	builds, bounded (in improvement)	System bus wired in redbear-full; session bus incomplete; Phase 3/4 improvement plan active; completeness: login1.Manager ~10%, login1.Session ~47%, login1.Seat ~20%, Notifications ~80%, UPower ~60%, UDisks2 ~50%, PolicyKit1 ~50%; StatusNotifierWatcher is the new service being added in Phase 4
redbear-sessiond	builds, scaffold (Phase 3/4 improvement active)	org.freedesktop.login1 D-Bus session broker — Rust daemon (zbus 5), wired on the redbear-full desktop path; Phase 3 hard gate is TakeDevice FD passing plus PauseDevice/ResumeDevice signal emission; Priority 1 in Phase 3/4 improvement plan
redbear-authd	builds	Privileged local-user auth daemon; /etc/passwd//etc/shadow//etc/group parsing, SHA-256/SHA-512 crypt verification, bounded lockout, target-side recipe build proven
redbear-session-launch	builds	User-session bootstrap tool; runtime-dir/env setup, uid/gid handoff, dbus-run-session → redbear-kde-session, target-side recipe build proven
redbear-greeterd	builds, experimental	Root-owned greeter orchestrator; UI/auth socket protocol, bounded restart policy, return-to-greeter daemon logic, crate tests pass; end-to-end runtime proof still pending
redbear-greeter UI	builds, experimental	Qt6/QML unprivileged login surface now ships in-tree; bounded runtime proof remains narrower than a full trusted KDE desktop-login claim
TUI login fallback	builds, boots	29_activate_console.service now owns VT3 activation for 30_console.service and 31_debug_console.service, keeping VT2/ debug fallback consoles independent of 20_greeter.service success
redbear-validation-session	builds, bounded helper	Still staged as a validation launcher/helper, but no longer the primary redbear-full display-service owner
Greeter runtime checker	✅ implemented (bounded checker)	redbear-greeter-check asserts greeter binaries, assets, service files, socket reachability, hello protocol, invalid-login handling, and a validation-only successful-login/session-return loop inside the guest
Greeter QEMU harness	✅ implemented (bounded harness)	test-greeter-qemu.sh boots redbear-full, logs in on the fallback console, and now passes the in-guest greeter checker for hello, invalid-login, and bounded successful-login return-to-greeter proof
redbear-notifications	✅ Scaffold	org.freedesktop.Notifications — logs to stderr, no display integration yet
redbear-upower	⚠️ scaffold / experimental	org.freedesktop.UPower — service exists, and the backing /scheme/acpi/power surface now performs real AML-backed enumeration, but its bootstrap preconditions and runtime proof are still too weak to call release-grade or consumer-validated; treat current enumeration as provisional until Wave 3 in local/docs/ACPI-IMPROVEMENT-PLAN.md closes
redbear-udisks	✅ bounded real	org.freedesktop.UDisks2 — enumerates real disk.* schemes and partitions into read-only D-Bus objects; no fabricated mount/serial metadata
Phase 5 D-Bus runtime proof	✅ implemented (bounded QEMU proof)	redbear-phase5-network-check + test-phase5-network-qemu.sh assert bounded QEMU service registration and current runtime plumbing on redbear-full; treat UPower as provisional until the ACPI power surface is made honest in local/docs/ACPI-IMPROVEMENT-PLAN.md Wave 3
Phase 6 Solid readiness proof	✅ implemented, blocked	redbear-phase6-kde-check + test-phase6-kde-qemu.sh now distinguish real Solid validation from blocked states; kf6-solid remains disabled until runtime proof + tooling are present
redbear-polkit	✅ Scaffold	org.freedesktop.PolicyKit1 — always-permit authorization; KAuth still uses FAKE backend because PolkitQt6-1 is not packaged yet
redbear-dbus-services	✅ Created	D-Bus activation files + policies staged
DRM/KMS	builds	redox-drm scheme daemon; 68 unit tests (KMS, GEM, PRIME, wire structs, scheme pure logic); no hardware runtime validation
GPU acceleration	blocked	PRIME/DMA-BUF ioctls and bounded private CS surface implemented; real vendor render CS/fence path still missing
validation compositor runtime	experimental	Reaches early init in QEMU; no complete session
validation profile	builds, boots	Bounded Wayland runtime profile
redbear-full profile	builds, boots	Active desktop/graphics compile surface; now owns the experimental greeter/auth/session-launch integration path
redbear-grub profile	builds	Text-only with GRUB chainload for bare-metal multi-boot
redbear-mini profile	builds	Minimal non-desktop compile target
redbear-hwutils	builds	lspci/lsusb tools; 19 unit tests (PCI location parsing, USB device description, argument handling)

Profile View

redbear-full

• Role: Active desktop/graphics compile target and current greeter-integration surface
• Current truth: Carries D-Bus, sessiond, broader integration pieces, and the experimental Red Bear-native greeter/auth/session-launch stack; VirtIO networking works in QEMU, the bounded Phase 5 network/session checker is evidence-backed there, and the repo now includes a bounded greeter checker/harness for the login surface. redbear-validation-session remains staged only as a bounded helper, not the active 20_display.service owner on this target. TUI fallback (30_console.service/31_debug_console.service) is now triggered through 29_activate_console.service and is decoupled from greeter success.
• Use for: Desktop integration testing, greeter/login bring-up, and bounded desktop/network plumbing validation
• Do not overclaim: This profile proves bounded QEMU desktop/network plumbing only. It does not by itself close the Wi-Fi implementation plan's later real-hardware Phase W5 reporting/recovery gate.

redbear-grub

• Role: Text-only target with GRUB boot manager for bare-metal multi-boot
• Current truth: Follows redbear-mini; text-only with GRUB chainload ESP layout, no desktop/graphics
• Use for: Bare-metal multi-boot, recovery with GRUB menu, and install workflows requiring GRUB

redbear-mini

• Role: Minimal non-desktop target
• Current truth: No desktop/graphics path; recovery and non-desktop integration surface only. TUI recovery is bound to VT activation through 29_activate_console.service followed by 30_console.service/31_debug_console.service.
• Use for: Minimal runtime bring-up, subsystem validation, and non-desktop packaging checks

Current Blockers

1. Runtime trust trails build success (Phase 1 gate)

The repo has real build-visible desktop progress, but build success exceeds runtime confidence. Phase 1 exists specifically to close this gap. Phase 1 test coverage is now comprehensive (300+ unit tests across evdevd, udev-shim, firmware-loader, redox-drm, redbear-hwutils). The remaining gap is live-environment runtime validation of these tested surfaces.

2. No complete compositor session (Phase 2 gate)

A bounded compositor initialization reaches early startup but does not complete a usable Wayland compositor session. This blocks all desktop session work. KWin is the sole intended compositor. No alternative (weston, wlroots) is in a working state. The KWin reduced path builds with 11 feature groups disabled but has zero runtime session evidence.

3. Greeter/login path now exists, but runtime proof is still missing (desktop-login gate)

The repo now carries the main non-visual pieces of the Red Bear-native greeter/login plan:

• redbear-authd
• redbear-session-launch
• redbear-greeterd
• redbear-greeter-services.toml
• redbear-greeter-check
• test-greeter-qemu.sh

Current truth for that slice:

Piece	Current state	Remaining limitation
redbear-authd	Target-side recipe build proven; unit tests cover passwd/shadow parsing, SHA-crypt and Argon2 verification, lockout, approval checks	Remaining risk is no longer auth-format handling, but broader desktop-session stability below the greeter slice
redbear-session-launch	Target-side recipe build proven; unit tests cover env/runtime-dir/argument handling, including current session environment contract	Remaining limitation is broader compositor/session stability, not the basic session-launch boundary
redbear-greeterd	Crate tests cover protocol-facing state strings, installed asset paths, bounded restart policy, and now own successful-login session launch directly after response delivery	Full desktop-login trust still depends on wider KDE runtime proof; the remaining instability is KWin compositor startup, not greeter/auth protocol wiring
Greeter validation helpers	redbear-greeter-check + test-greeter-qemu.sh exist and are wired for bounded runtime proof	The successful-login path is validation-only and does not replace broader KDE session proof, but the bounded QEMU greeter proof now passes
redbear-greeter packaging	Builds in-tree	Qt/QML UI binary, compositor wrapper, branded assets, and a shared login-protocol crate are present; Qt shared-plugin loading now works in the guest, while broader KWin runtime stability still remains experimental

This means Red Bear now has a credible bounded runtime-visible login boundary, but not yet a runtime-trusted general-purpose graphical login surface.

4. KWin reduced build is now dependency-honest, but runtime proof is still missing (desktop-session gate)

The reduced KWin path now builds with honest provider linkage for libepoxy, lcms2, libudev, and libdisplay-info.

Current truth for that slice:

Dependency	Current state	Remaining limitation
libepoxy	Real dependency	No blocker in this slice
lcms2	Real dependency	No blocker in this slice
libudev	Honest scheme-backed provider (libudev.so)	Hotplug monitoring remains bounded rather than full eudev parity
libdisplay-info	Honest bounded provider (libdisplay-info.so)	Base-EDID parsing only; CTA / DisplayID / HDR metadata remain unsupported

Additionally, two packages still need more honest session-ready treatment: kirigami (stub-only), kf6-kio (heavy shim).

5. Hardware acceleration missing GPU CS ioctl (Phase 5 gate)

PRIME/DMA-BUF buffer sharing is implemented at the scheme level, and a bounded private CS surface now exists for shared-contract work. Real vendor render command submission and shared fence semantics still do not exist. This still blocks hardware-accelerated rendering.

The repo now also carries a bounded in-guest display checker, redbear-drm-display-check, with shell wrappers at local/scripts/test-drm-display-runtime.sh, test-amd-gpu.sh, and test-intel-gpu.sh. It now covers direct connector/mode enumeration and bounded direct modeset proof over the Red Bear DRM ioctl surface, but it is still only a runtime evidence tool until it is exercised on real Intel and AMD hardware.

6. KDE Plasma session assembly blocked on QML stack (Phase 4 gate)

Kirigami is stub-only (Qt6Quick not available on Redox). kf6-kio is heavily shimmed (QtNetwork disabled, KIOCORE_ONLY=ON). kf6-knewstuff and kf6-kwallet are stub-only. These collectively prevent plasma-workspace from building honestly, which blocks the entire KDE Plasma session.

7. QtNetwork disabled blocks KDE network integration

QtNetwork is intentionally disabled because relibc networking is too narrow. This prevents Qt-based network applications, kf6-kio network transparency, and KDE network-dependent features.

8. Build system improvements completed

The build system has received targeted fixes that improve reliability:

Component	Fix	Status
OnceLock panic	get_or_init pattern now used instead of direct once_cell access that could panic	Fixed
disk.mk error suppression	Meaningful error messages now surface instead of suppressed failures	Fixed
prefix.mk wget retry	Retry logic added: 3 tries with 30-second timeout	Fixed

9. Init/config cleanup completed

Init service configuration has been streamlined:

• 10 unnecessary ion -c wrappers removed from redbear-mini.toml and redbear-full.toml (sessiond, upower, udisks, polkit, authd, echo, and others)
• D-Bus service retains ion -c wrapper (justified: requires shell chaining for proper daemonization)
• redbear-login-protocol recipe.toml created and symlinked into recipe search path
• redbear-statusnotifierwatcher symlinked into recipes/system/

Canonical Document Roles

Document	Role
local/docs/CONSOLE-TO-KDE-DESKTOP-PLAN.md	Canonical desktop path plan (v2.0, Phase 1–5)
This document	Current build/runtime truth summary
local/docs/DRM-MODERNIZATION-EXECUTION-PLAN.md	Canonical GPU/DRM execution plan beneath the desktop path
local/docs/QT6-PORT-STATUS.md	Qt/KF6/KWin package-level build status
local/docs/AMD-FIRST-INTEGRATION.md	AMD-specific hardware/driver detail
local/docs/WAYLAND-IMPLEMENTATION-PLAN.md	Canonical Wayland subsystem plan
docs/05-KDE-PLASMA-ON-REDOX.md	Historical KDE design rationale
local/docs/PROFILE-MATRIX.md	Profile roles and support-language reference

Bottom Line

The Red Bear desktop stack has crossed major build-side gates and one important bounded runtime gate:

• All Qt6 core modules, all 32 KF6 frameworks, Mesa EGL/GBM/GLES2, and D-Bus build
• Four supported compile targets exist, with desktop/graphics on redbear-full
• the Red Bear-native greeter/login path now has a bounded passing QEMU proof (GREETER_HELLO=ok, GREETER_INVALID=ok, GREETER_VALID=ok)
• relibc compatibility is materially stronger than before
• Phase 1 test coverage is comprehensive: 300+ unit tests across all Phase 1 daemons (evdevd 65, udev-shim 15, firmware-loader 24, redox-drm 68, redbear-hwutils 19, bluetooth/wifi 209)
• KWin reduced path builds with honest dependency linkage (libepoxy, lcms2, libudev, libdisplay-info) but has no compositor session proof
• Critical blockers for Phase 4: kirigami stub (needs Qt6Quick), kf6-kio shim (needs QtNetwork), kf6-knewstuff/kwallet stubs

The remaining work is broader runtime validation, compositor/session stability, and the remaining KDE session/runtime proof work. Phase 1 (Runtime Substrate Validation) has comprehensive test coverage; the remaining gate is live-environment runtime validation. The key boundary for Phase 2 is: no compositor session proof exists. The key boundary for Phase 3-4 is: kirigami, kf6-kio, and QML dependencies must become honest before KDE Plasma session assembly can proceed.