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vasilito 8fa62d20c9 state: Qt6::Sensors + libinput both built — 2 of 3 platform prerequisites resolved 
Platform prerequisite status:
- Qt6::Sensors: BUILT (v6.11.0, 520KB pkgar, dummy backend)
- libinput: BUILT (v1.30.2, with libevdev v1.13.2 + linux-input-headers)
- QML/Quick JIT: still disabled on Redox (blocks real KWin binary,
  kirigami, plasma-framework)

KWin: now attempts real cmake build with Sensors + libinput deps
enabled. Falls back to redbear-compositor shim on cmake failure
(QML/Quick gate). Previously kwin was pure stub — now it's a
bounded build attempt with fallback.

Enabled in config (new this session):
- qt6-sensors, libevdev, libinput, kdecoration, kf6-kcmutils

Previously OOTB dependencies now resolved:
- libevdev → libinput → KWin real build path opened
- linux-input-headers → libevdev → libinput chain
- qt6-sensors → KWin Sensors dependency satisfied
2026-04-30 08:47:15 +01:00

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Red Bear OS — Comprehensive Desktop Readiness Assessment and Improvement Plan

Date: 2026-04-30 Scope: Full desktop OS readiness: microkernel, devices, DRM, Wayland, KDE Status: This document is the single source of truth, superseding all earlier individual plans.

1. Executive Summary

Red Bear OS has meaningful build-side progress across all major subsystems. The current state is:

Subsystem Status Confidence
Kernel (35 syscalls, 12 schemes) 🟢 Boot-capable High
ACPI boot baseline 🟢 Complete High
IRQ/LAPIC/x2APIC 🟢 Kernel IRQ active High
PCI/MSI-X 🟡 QEMU-proven, no hardware Medium
IOMMU 🟡 QEMU-proven Medium
USB (xHCI/hub/HID/storage) 🟡 QEMU-only Medium
Storage/Network drivers 🟢 Hardened High
Audio/Input drivers 🟡 Hardened, untested Medium
Wi-Fi 🔴 Host-tested, no hardware Low
Bluetooth 🔴 Experimental BLE-only Low
relibc (POSIX) 🟢 ~38 active patches, ~85% coverage High
DRM stack 🟡 Builds, swrast-only Medium
Qt6/KF6 🟡 32/32 KF6 builds, QtNetwork re-enabled Medium
Wayland 🟡 Libs built, compositor incomplete Low
KDE Plasma 🔴 Blocked (kwin stub, no full session) Very Low

Bottom Line

The OS boots, but a graphical KDE Plasma desktop session is not yet functional. The blocker chain: kernel credential syscalls → ACPI shutdown robustness → hardware validation → Wayland compositor runtime → KWin → full Plasma session.

Critical Single Blocker

Credential syscalls (SYS_SETUID, SYS_SETGID, SYS_SETGROUPS, etc.) are ENOSYS in the Redox microkernel. These are required by polkit, dbus-daemon, logind, and other desktop infrastructure components. The syscall numbers are defined in the external redox_syscall crate (crates.io), not in the kernel tree. Fixing this requires upstream crate changes AND kernel handler additions.

2. Kernel & Core Infrastructure

2.1 Syscall Coverage: ~35 handled, catch-all ENOSYS

The kernel handles 35 syscalls explicitly. All others fall through to ENOSYS.

Genuinely missing for desktop:

  • SYS_SETUID, SYS_SETGID, SYS_SETGROUPS, SYS_GETGROUPS — credential syscalls, ENOSYS
  • SYS_GETRLIMIT, SYS_SETRLIMIT — resource limits, ENOSYS
  • SYS_CLOCK_SETTIME — set system clock, ENOSYS
  • SYS_PTRACE — debugging, handled via scheme paths

2.2 ACPI: Boot-complete, not release-grade

Working Not Working
RSDP/SDT, MADT, APIC/x2APIC acpid startup has panic-grade expect paths
FADT shutdown via kstop _S5 derivation gated on PCI timing
power_snapshot() with AML-backed enumeration DMAR orphaned in acpid source
EC byte-transaction access Sleep-state beyond S5 incomplete

2.3 Drivers: All hardened, no hardware validation

All 24 driver categories have been hardened (panic→error conversion). Zero drivers have real hardware validation. All testing is QEMU-only.

2.4 USB: QEMU-validated xHCI

  • xHCI: 88 Red Bear patches, interrupt-driven, QEMU-only
  • hub: Good quality, interrupt-driven change detection
  • HID: Named InputProducer with legacy fallback
  • Storage: ReadCapacity16 with SCSI error handling
  • Missing: Real hardware, EHCI/UHCI/OHCI runtime paths

2.5 Wi-Fi: Host-tested transport, no real hardware

  • Intel PCIe transport builds, 119 tests pass
  • LinuxKPI compat with 17 modules, 93 tests
  • redbear-wifictl daemon + scheme interface
  • Blocked: No Intel hardware available; current host has MediaTek MT7921K

2.6 Bluetooth: Experimental BLE-first

  • Controller probe via USB, HCI init, scheme:hciN with full SchemeSync
  • GATT client workflow (discover→read), 209 tests
  • QEMU validation in progress, not stabilized

3. Desktop Stack

3.1 DRM/Mesa: Builds, software-rendering only

Component Status
redox-driver-sys ✅ Builds
linux-kpi ✅ Builds
redox-drm ✅ Builds (68 unit tests)
mesa ✅ Builds EGL/GBM/OSMesa, swrast only (-Dgallium-drivers=swrast)
amdgpu ✅ Builds + included in redbear-full
firmware-loader ✅ Builds
iommu daemon ✅ Builds

Hard blockers: GPU command submission, fence/completion signaling, Mesa hardware winsys enablement. These require GPU-architecture-specific engineering.

3.2 Wayland: Libraries built, compositor incomplete

Component Status
libwayland ✅ Builds
wayland-protocols ✅ Builds
smallvil (reference) ✅ Bounded validation proof
cosmic-comp Historical only
Full compositor runtime ❌ Not present

3.3 Qt6/KF6: 32 frameworks built, QtNetwork re-enabled

Component Status
qtbase (Core+Gui+DBus+Wayland) ✅ Builds
QtNetwork ✅ Re-enabled (was disabled) — DNS resolver hardened
qtdeclarative, qtsvg, qtwayland ✅ Builds
KF6 Frameworks ✅ 32/32 built
kirigami ⚠️ Stub-only
kf6-knewstuff 🔄 Unblocked by QtNetwork — needs rebuild
kf6-kio 🔄 Source-local QtNetwork compat headers

3.4 KDE Plasma: Not booting

Component Status
kwin 🔄 Building (stub → real transition)
plasma-workspace ❌ Blocked by kf6-knewstuff
plasma-desktop ❌ Blocked by plasma-workspace
Full Plasma session ❌ Not functional

4. Implementation Action Plan

Phase 1: Foundation Hardening (Weeks 1-3)

# Action Impact
1.1 Fix acpid startup panic paths Remove expect-based crash risks
1.2 Document AML bootstrap producer contract Enable safe AML-free fallback
1.3 Add device driver hardware validation harness USB, storage, network
1.4 Complete Qt6 rebuild with QtNetwork enabled Unblock kf6-knewstuff

Phase 2: Core Stack Completion (Weeks 4-8)

# Action Impact
2.1 Build KWin as real (not stub) compositor Wayland compositor runtime
2.2 Complete Wayland compositor integration graphical session proof
2.3 Wire KDE Plasma session components plasma-workspace, plasma-desktop
2.4 Hardware USB validation Real xHCI controller testing

Phase 3: Hardware Enablement (Weeks 9-16)

# Action Impact
3.1 Wi-Fi real hardware validation Intel iwlwifi proof
3.2 Bluetooth real hardware validation USB-attached controller proof
3.3 IOMMU real hardware validation AMD-Vi/Intel VT-d proof
3.4 ACPI sleep-state support S3/S4 suspend/resume

Phase 4: Desktop Polish (Weeks 12-20)

# Action Impact
4.1 GPU hardware rendering (if feasible) Mesa radeonsi/intel drivers
4.2 Full KDE Plasma session runtime Booting into graphical desktop
4.3 Desktop Wi-Fi API (D-Bus) NetworkManager-like surface
4.4 Bluetooth desktop integration HID, audio, file transfer

Kernel Blocker (Parallel, upstream-dependent)

# Action Impact
K1 Engage Redox upstream for credential syscall additions in redox_syscall SYS_SETUID, SYS_SETGID, SYS_SETGROUPS
K2 Add kernel handler for credential syscalls Remove ENOSYS catch-all gap
K3 Add RLIMIT syscalls or formally design them out Resource limit support

5. Documentation

Stale Docs Deleted (this pass)

File Reason
local/docs/AMDGPU-DC-COMPILE-TRIAGE-PLAN.md Superseded by DRM-MODERNIZATION-EXECUTION-PLAN.md; amdgpu now builds

Authority Chain

Document Role
local/docs/RELIBC-COMPREHENSIVE-ASSESSMENT.md Canonical relibc
local/docs/DRM-MODERNIZATION-EXECUTION-PLAN.md Canonical GPU/DRM
local/docs/CONSOLE-TO-KDE-DESKTOP-PLAN.md Canonical desktop path
local/docs/DESKTOP-STACK-CURRENT-STATUS.md Current build/runtime truth
This document Canonical full-OS assessment
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