Major revision: replaces v4.1 with a code-grounded audit where every claim
is verified by direct source inspection. Corrects several false claims
in v4.1 and adds an honest gap matrix grounded in a live CachyOS
desktop ISO booted in QEMU 11.0 as the functional reference.
Corrections to v4.1:
- audiod EXISTS at local/sources/base/audiod/ (real implementation,
277 lines, mixer with volume control and HANDLE_BUFFER_SIZE=4096)
- redbear-input-headers EXISTS at local/recipes/drivers/redbear-input-headers/
(recipe.toml + source/include/linux/linux/ with input.h, uinput.h)
- inputd is a real producer/consumer multiplexer, not a stub
- synthetic_edid() is not a stub — generates valid 1920x1080@60Hz EDID
with correct checksum
- The Mesa LDFLAGS -lorbital link is the real EGL path issue, not
'EGL works'
New v5.0 findings (not in v4.1):
- ATOMIC ioctl in redox-drm passes empty connectors to set_crtc
(showstopper, scheme.rs:1733)
- No render node (renderD128) — Wayland compositors need this
- PRIME export uses in-memory token, not real DMA-BUF FD — blocks Mesa
- No VIRTIO_GPU_CMD_RESOURCE_MAP_BLOB handler
- No host→guest resize notification processing in IRQ handler
- libdrm missing DRM lease ioctls
- redbear-compositor missing xdg-shell, zwp_linux_dmabuf, wp_presentation,
zwp_linux_explicit_synchronization (showstoppers for modern Wayland)
- redbear-compositor page flip reopens DRM fd every call
- usbhidd/ps2d send to inputd (Orbital path) not to evdevd
- evdevd not in init system of redbear-full
- No virtio-input or virtio-snd drivers (QEMU specific)
Critical path to functional QEMU Wayland desktop (12 weeks, no hardware):
Phase 1: Fix DRM atomic modeset (2-3 weeks)
Phase 2: Fix Mesa EGL Wayland (1 week)
Phase 3: Add compositor protocols xdg-shell + dmabuf + presentation (2-3 weeks)
Phase 4: Wire input pipeline to compositor (1-2 weeks)
Phase 5: Add virtio-input + virtio-snd drivers (1-2 weeks)
Phase 6: QEMU end-to-end validation vs CachyOS (1 week)
Total to software-rendered Wayland desktop on QEMU: 12 weeks.
Total to software-rendered KDE Plasma (QML gate): 18 weeks.
Total to hardware-accelerated QEMU desktop (Mesa virgl): 22 weeks.
Total to real AMD/Intel GPU: 42 weeks (requires hardware).
vasilito
2e0fa30885