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marfrit eff6fb5b29 Phase 0: campaign skeleton, research question pending

Spun off 2026-05-03 from the closed-without-patch
kwin_overlay_subsurface campaign (its phase8_handover.md is
the predecessor). The candidate research question is whether
running an X11 session on PineTab2 reproduces, eliminates, or
transforms the drop-inversion phenomenon that motivated the
predecessor — but the framing is provisional and awaits
operator confirmation before Phase 1 lock.

phase0_findings.md is the substrate doc:
- Predecessor close-out summary (three reasons no patch
  landed; replicate-baseline-first lesson).
- What stays valid from the predecessor (Phase 1 scanout
  archaeology, Phase 2-prime KWin Wayland source-read which
  does NOT transfer to X11, Δ_present-46ms reproducible
  side-finding which is directly testable under X11,
  measurement infrastructure with WAYLAND_DEBUG-specific
  parts that don't transfer).
- Current ohm state (carry-over predecessor tooling, governor
  pin, baloo disabled, kwin-fourier still installed).
- Provisional research question with three plausible
  outcomes (α/β/γ) and four alternate framings the operator
  may have in mind that this question doesn't cover.
- Working-assumption out-of-scope list (no patches, no MRs,
  no Δ_present chase yet).
- Four pre-question Phase 0 deliverables that are unblocked
  regardless of framing: ohm state snapshot, X11-path
  inventory, X11 measurement-tool inventory, A1
  Wayland-baseline rep on this campaign's session for future
  comparison anchor.

worklist.md tracks Phase 0 only. Phase 1 lock awaits the
research question. Discipline carry-overs from
kwin_overlay_subsurface listed (replicate baseline first;
phase discipline; non-upstreaming default; memory
persistence at close).

README.md status banner: Phase 0 in progress, research
question pending operator confirmation.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-03 06:38:24 +00:00

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x11-session-research

Status: PHASE 0 — research question pending operator confirmation. See phase0_findings.md § "Research question (provisional)" for the candidate framing drafted from the predecessor campaign's close-out. Phase 1 lock will not happen before the operator confirms or redirects.

Campaign to investigate X11 session behaviour on PineTab2 RK3568, in the context of the just-closed kwin_overlay_subsurface campaign. Whether running an X11 (Xorg) session on the same hardware would (a) reproduce the drop-inversion phenomenon that motivated the predecessor, (b) bypass it entirely, or (c) introduce a different set of constraints, is the most likely campaign question — but this is a working assumption, not a locked goal. See phase0_findings.md.

Predecessor

This campaign exists because ../kwin_overlay_subsurface/ closed 2026-05-03 without patch (phase8_handover.md). Its diagnostic loop terminated at "Phase 0 cage = 0 post-warmup drops floor not reproducible at N=3." The natural next move across the design surface is to vary the display server (X11 instead of Wayland) on the same hardware and the same client binary, but the operator has not yet confirmed that as the campaign's specific question.

Hardware target (provisional, same as predecessor)

ohm — PineTab2, Rockchip RK3568 (4× Cortex-A55, Mali-G52 MP2, hantro G1/G2 VPU). Kernel 6.19.10-danctnix1-1-pinetab2. Mesa 26.0.5. Currently runs KDE Plasma 6.6.4 Wayland.

For an X11-session campaign, ohm needs an Xorg + Plasma X11 (or similar X11 desktop) install path verified. As of 2026-05-03, the only confirmed display path on ohm is startplasma-wayland. Whether Plasma X11, an alternate X11 desktop (XFCE, openbox, lightweight WM), or Plasma running under a Wayland-Xorg shim is in scope is part of the research question to be locked.

Carry-overs from predecessor (still active on ohm)

Per kwin_overlay_subsurface/phase1_evidence/ohm_tooling_revert_log.md:

qt6-base-fourier 1:6.11.0-3 installed.
kwin-fourier 1:6.6.4-3 installed.
CPU governor pinned to performance (was conservative).
Baloo permanently disabled (Indexing-Enabled=false in ~/.config/baloofilerc).
drm-info 2.9.0-1 installed.

These were not reverted at the predecessor's close-out. This campaign inherits them unless an explicit revert is part of the design.

Non-upstreaming default

Inherited from the predecessor and from ohm_gl_fix. Bug reports + MRs are explicit operator-tasked decisions, not background process steps.

File map (will grow)

File	What it is
`README.md`	This file.
`phase0_findings.md`	Substrate from the predecessor + the candidate research question. Awaits operator confirmation/redirect on the question itself.
`worklist.md`	Phase-by-phase task list. Phase 0 only as of campaign start.

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