Single-question matrix campaign. Operator: mfritsche. Reviewer: handover to fresh model instance per 8(+1)-phase loop Phase 5. Local artifacts: /home/mfritsche/src/fourier_attribution/ on noether.

Predecessors (substrate, NOT data): ohm_gl_fix (closed 2026-05-02), kwin_overlay_subsurface (closed 2026-05-03 without patch), x11-session-research (closed 2026-05-03 negative on both axes). This campaign acts on the replicate-baseline-first lesson — every binding cell number from in-session reps.

Single-question campaign on PineTab2 RK3568: for each of qt6-fourier, kwin-fourier, and chromium-fourier, is there a measurable, replicable benefit on bbb 1080p first-60s playback when that package is toggled off, vs the all-on baseline?

Spun off 2026-05-03 from the fourier umbrella, with strict scope discipline. The earlier fourier work (now dormant at ~/src/fourier/) digressed into fix-this-fix-that across browsers, mpv, libva, libplacebo, KWin, qt6, and kernel; this campaign separates wheat from chaff by attribution measurement under controlled package toggling.

• Hardware: ohm (PineTab2 — RK3568, Mali-G52 MP2, hantro G1/G2 VPU)
• Workload: `bbb_1080p30_h264.mp4` first 70 seconds via `brave_drops_test.html`
• Three Arch packages: `qt6-base-fourier`, `kwin-fourier`, `chromium-fourier`

(chromium-fourier in this campaign = the binary at /tmp/chromium-ohm-gl-fix-step2/chrome — ohm_gl_fix Step 1 + Step 2 patches)

• Single Wayland session — Plasma 6.6.4 with KWin compositor

• Any other fourier-flavoured patches (firefox-fourier, kernel-vb2-dma-resv, libva-v4l2-request port)
• Any patch authoring or upstream activity
• X11 sessions / non-compositing WMs (closed in `x11-session-research`)
• Δ_present-46ms side-finding (predecessor's hook; not the question here)
• mpv, gst-launch, or any non-browser client
• Other clips, other resolutions, other codecs

This is the fourth campaign in a chain on the same hardware target:

1. [`../ohm_gl_fix/`](../ohm_gl_fix/) — closed 2026-05-02. Diagnosed Step 1 (libva-v4l2-request port) and Step 2 (Chromium WaylandConnection overlay-route) issues; produced the `/tmp/chromium-ohm-gl-fix-step2/chrome` binary used here.
2. [`../kwin_overlay_subsurface/`](../kwin_overlay_subsurface/) — closed 2026-05-03 *without patch*. Premise (cage = 0 floor at N=1) didn't replicate at N=3. Lesson now codified in `feedback_replicate_baseline_first.md`.
3. [`../x11-session-research/`](../x11-session-research/) — closed 2026-05-03 *with negative result on both axes*. X11 + non-compositing WM is *worse* than Plasma Wayland on this hardware/workload; X server doesn't program Plane 39 with NV12 regardless of client.
4. This campaign (`fourier_attribution`) — opened 2026-05-03.

Per feedback_replicate_baseline_first.md: predecessor *measurement numbers* (drop counts, CPU%, freq) are reference history only. Every binding cell in this campaign anchors to in-session-acquired data.

8(+1)-phase loop per ~/.claude/projects/-home-mfritsche-src/memory/feedback_dev_process.md. Phase 0 substrate captured 2026-05-03 across phase0_evidence/:

• `state_2026-05-03.md` — package state matches predecessor carry-over claim; revert paths clean (same-upstream-version stock packages cached)
• `test_rig_audit_2026-05-03.md` — predecessor test rig is intact; instrumentation reports per-second drops trajectory (sufficient for `drops_5s` / `drops_60s`); no Step 2 feature-flag opt-in needed (compiled in)
• `devfreq_probe_2026-05-03.md` — panfrost devfreq at `/sys/class/devfreq/fde60000.gpu/`; trans_stat + cur_freq parseable; governor `simple_ondemand` (dynamic — workload-sensitive signal)

Phase 1 binding cells locked at:

• `drops_5s` — drops in first 5s (warmup phase, file load + cache fill; reported but excluded from pass/fail)
• `drops_60s` — drops over the 60s steady-state window (5s–65s)
• `effective_fps` over 60s
• `browser_cpu_pct` — top sampling 5s–65s
• `kwin_cpu_pct` — same window
• `panfrost_mean_freq_mhz` — trans_stat-diff weighted mean over 5s–65s
• `panfrost_peak_freq_pct` — % of 60s spent at 800 MHz (Mali max)

Pass/fail threshold for “P delivers measurable benefit”: P-off cell increases drops_60s beyond all-on N=3 IQR, or any of {browser_cpu_pct, kwin_cpu_pct, panfrost_mean_freq_mhz} increases beyond its all-on N=3 IQR.

Note: this campaign uses 5s warmup boundary per operator instruction. The predecessor's phase3_prime_runs/post_process.sh uses 10s. The boundary divergence makes our drop counts not numerically comparable to predecessor numbers; that's intentional under campaign-contained data discipline.

N=3 reps per cell. 12 reps total. 70s window per rep, 60s steady-state at 5s–65s.

Local only for now (private working tree). Push to gitea later if the campaign reaches a useful conclusion worth publishing.

This file is the umbrella reference for Phase 0 work. Detail evidence files in phase0_evidence/:

• `state_2026-05-03.md` — package + kernel + governor + session state on ohm
• `test_rig_audit_2026-05-03.md` — predecessor test rig (`brave_drops_test.html`, `run_browser_nodebug.sh`, `post_process.sh`) audit, Cell B Brave invocation finalised, Step 2 feature-flag question resolved
• `devfreq_probe_2026-05-03.md` — panfrost devfreq instrument verification

*“For each of qt6-fourier, kwin-fourier, and chromium-fourier on PineTab2 RK3568, is there a measurable, replicable delta on bbb 1080p first-60s playback when that package is toggled off (replaced by stock equivalent), versus the all-on baseline?”*

Each fourier package alters a different layer of the playback stack:

• `chromium-fourier` ships Step 1 (libva-v4l2-request hantro multi-planar / chromium-149 era port) and Step 2 (Chromium WaylandConnection patch — overlay-route engages on KWin). Predecessor evidence (`ohm_gl_fix/phase3_remeasure_2026-05-02/task23_per_frame_route.md`) shows Step 2 engages with the chromium-fourier binary; whether engagement translates to measurable benefit is what this campaign tests.
• `qt6-base-fourier` patches `qt6-base` for the `GL_ALPHA` stall. KWin links libQt6Gui; if KWin is the GL-composite step (per `wayland_baseline_2026-05-03/drmprobe_findings.md`, Plane 39 rotates ABGR8888 framebuffers under all reps), the qt6-fourier patch could affect KWin's per-frame work.
• `kwin-fourier` patches KWin for the `watchDmaBuf` fence-wait issue. Direct effect on KWin's compositor scheduling.

The campaign does not commit to any of these mechanisms. It only measures whether toggling each off shifts the binding cells.

• `ohm_gl_fix` closed 2026-05-02 with the Step 2 WaylandConnection patch landed but Phase 1r `drops_post_warmup == 0` met *only* under cage. Spun off the residual cost into `kwin_overlay_subsurface`.
• `kwin_overlay_subsurface` closed 2026-05-03 *without patch*. Premise was “cage = 0 floor at N=1 from Phase 0” — at N=3 in the closing session, the floor was missing (post-warmup median 26).
• `x11-session-research` closed 2026-05-03 *with negative result on both axes*. X11 + xfwm4-no-comp produces *more* drops than Plasma Wayland with KWin compositing. X server doesn't program Plane 39 with NV12 regardless of client (mpv-xv, mpv-gpu — neither route engages).

The lesson from kwin_overlay_subsurface: don't anchor a campaign on N=1 historical numbers. This campaign acts on that lesson — every binding cell number comes from in-session reps acquired in this campaign's session.

1. Chromium-fourier off → Brave or stock Chromium 149? Resolved: Brave (operator sign-off 2026-05-03). Two-major-version delta (Brave 147 vs chromium-fourier 149) documented as known confound.
2. Reversibility on ohm — cell C/D revert path. Resolved: pacman cache has stock kwin-6.6.4-1 and qt6-base-6.11.0-2 at the *same upstream version* as the fourier-patched ones. Logout + auto-login per cell (operator instruction).
3. 5s vs 10s warmup boundary. Resolved: 5s (operator instruction). Diverges from predecessor's 10s in `phase3_prime_runs/post_process.sh`.
4. Step 2 feature-flag opt-in name. Resolved: there is no flag. Step 2 patch is compiled-in and engages by default.
5. Window-size pin. Resolved: do not pin (mirror predecessor invocation; the video element is fixed at 800×450 in the .html anyway).
6. Where does the orchestrator live? Resolved: new `~/fourier-attribution/` dir on ohm, separate from predecessor's `phase3_prime_runs/`. Carries `run_browser_attribution.sh` (devfreq capture added) and `post_process_attribution.sh` (5s warmup boundary; mean-freq + peak-freq% derived from trans_stat diff).

• Locked research question + mechanism + experimental matrix (4 cells × N=3)
• Predecessor test rig audit + Cell B Brave invocation
• Panfrost devfreq instrument verification
• Phase 0 in-session baseline anchor of cell A — *to be acquired in task #54*

Once #54 lands, Phase 1 binding cells lock with cell-A IQR widths in evidence, and the pass/fail thresholds are concrete.

Cell A = all three fourier packages on (qt6-base-fourier 1:6.11.0-3, kwin-fourier 1:6.6.4-3, chromium-fourier 149.0.7812.0 binary), Plasma Wayland, KWin compositor.

• Kernel: `6.19.10-danctnix1-1-pinetab2`
• Active session: tty2 Plasma Wayland (kwin_wayland PID 53655)
• Operator's daily Brave (PID 58105 etc.) running in background, ~13% CPU idle. Documented as stable ambient confound across all three reps.
• Reps run consecutively, each ~95s wall, with ~10s settle gap between
• Reps timestamps: a_rep1 22:51 CEST, a_rep2 22:55 CEST, a_rep3 22:58 CEST

The N=3 range is used as a conservative IQR proxy (with N=3, p25 ≈ min, p75 ≈ max). Tighter than 95% CI but appropriate for the small N.

• `drops_60s` range: 5
• `effective_fps` range: 0.01 (effectively zero — very stable)
• `kwin_cpu_median` range: 0.0 (exact tie across reps — top -d 1 rounds to integer percent at this CPU level)
• `browser_cpu_median` range: 0.6
• `panfrost_mean_freq_mhz` range: 8.9 (≈ 1.5% of mean)
• `panfrost_peak_freq_pct` range: 1.3 (percentage points)

1. Effective fps is essentially locked at 24.0. The clip is 24 fps despite the `_30` in the filename. All three reps decode the full 60-second window's frames within 0.01 fps of each other. The test is *not* fps-bound; binding-cell discrimination must come from drops, CPU%, or panfrost freq.

1. CPU metrics are exceptionally stable. kwin_cpu_median is 12.0% in all three reps to 0.1% precision. browser_cpu_median spans 0.6 percentage points. This means tiny shifts when cells B/C/D run will be detectable.

1. panfrost_mean_freq_mhz is 591–600 MHz — well below the 800 MHz peak. Mali isn't pegged. The simple_ondemand governor is dialling between 400 / 600 / 800 MHz to track demand. Time at 800 MHz peak is consistently ~35% of the window.

1. drops_60s ranges 15–20. Predecessor's `kwin_timing_nodebug_rep1` reported drops_total=27 (no campaign-data import — cited only as broad ballpark verification). Our numbers cluster slightly lower; not surprising given ambient-state differences (different uptime, different daily-Brave activity, different cache state). The campaign-contained data discipline holds: this is OUR baseline; comparison is against THESE reps' IQR.

1. drops_post_5s spans 4–10. This is the largest relative variance (factor of 2.5×). Drops *during steady state* are the most rep-to-rep variable signal. Whether a cell-toggle moves this beyond the IQR will be the most stringent threshold test.

1. Thermal drift 7.8–10.6°C in 90s indicates the SoC is under genuine sustained load. No throttling triggered (max temp around 56°C; throttle threshold ~85°C).

A package P delivers measurable benefit if the P-off cell at N=3 exceeds ALL of the following deltas relative to the cell A median:

The thresholds are deliberately conservative on metrics where cell A IQR was 0 (kwin_cpu_median, panfrost_peak_freq_pct), inflated to 0.5–1 unit to avoid spurious-significance on rounding artefacts. A package needs to hit ANY ONE of the threshold deltas to count as having measurable benefit; a package that hits NONE is “no measurable benefit on this matrix” — explicit chaff.

Three reps acquired in-session, very tight on CPU/freq metrics, moderate variance on drops (consistent with Phase 3-prime predecessor experience that drops are the noisiest signal). Cell A baseline locked. Phase 1 binding-cell thresholds drafted above; lock when reading them back to operator.

Phase 0 task #54 = COMPLETE.

Matrix executed in full: 4 cells × N=3 reps = 12 reps acquired in-session on ohm (PineTab2 RK3568, kernel 6.19.10-danctnix1-1-pinetab2, mesa 26.0.5, governor=performance, baloo off, daily Brave killed for clean ambient, autologin via campaign-temporary 99-autologin-fourier-attribution.conf since reverted).

Per-rep summary.txt and start.txt mirrored locally to phase4_evidence/{a,b,c,d}_rep[1-3]_*.

Threshold rule: P-off cell delivers measurable benefit if the off-cell exceeds cell A median by:

• drops_60s ±5 | effective_fps ±0.05 | kwin_cpu_median ±0.5 | browser_cpu_median ±1 | panfrost_mean_freq_mhz ±10

Verdict: chromium-fourier delivers measurable benefit. 3 of 5 metrics fail when off.

Caveat: Cell B confounds *chromium-fourier patches* with *Brave-vs-Chromium-version* differences (Brave 1.89.145 = Chromium 147 base; chromium-fourier = Chromium 149 base). The +83pp browser CPU is plausibly part version-bump and part patch-engagement (chromium-fourier Step 1 + Step 2). Not separable in this matrix; would need stock-Chromium-149 build as additional cell.

Verdict: qt6-fourier delivers NO measurable benefit on this workload. Zero of 5 metrics fail when off. The single marginal panfrost delta is in the wrong direction (less GPU work without qt6-fourier), suggesting qt6-fourier may even have a tiny GPU cost on this workload — though the magnitude is at the IQR edge.

Caveat: qt6-fourier patches qt6-base for the GL_ALPHA stall. That stall may not be triggered by 1080p H.264 NV12 video playback in chromium-fourier; the patch could still help other workloads (different video formats, mixed application loads, etc.) not in scope here.

Verdict: kwin-fourier delivers MASSIVE measurable benefit. 4 of 5 primary metrics fail when off, with the kwin-CPU and panfrost-freq deltas being huge.

This is consistent with the predecessor's diagnosis that kwin-fourier patches a watchDmaBuf fence-wait issue. Without the patch, KWin spins waiting on dmabuf fences that should already be signaled, doing extra GL composite work, driving Mali to near-max all the time. The packaged fix is doing real work on this workload.

WHEAT (measurable benefit on bbb 1080p H.264 60s playback, ohm/PineTab2):

• kwin-fourier — load-bearing. Removing it triples kwin CPU, drives Mali GPU to 95% peak-freq residency, doubles drops_60s. Likely the single most impactful fourier package on this hardware/workload.
• chromium-fourier — measurable benefit, magnitude inflated by Brave-vs-Chromium-149 version confound. Real signal exists (3 of 5 metrics fail when swapped to Brave); cleanest separation would need a stock-Chromium-149 control cell, out of scope here.

CHAFF (no measurable benefit on this specific workload, ohm/PineTab2):

• qt6-fourier — zero of 5 metrics moved beyond cell A IQR when removed. Cell C medians are within rep-to-rep noise of cell A. The GL_ALPHA stall the patch addresses doesn't trigger in this scenario. *Not a statement about other workloads*; just chaff for this specific binding-cell set.

1. Brave-vs-Chromium-149 confound in cell B. Could be resolved with a stock Chromium 149 build as a fifth cell. Out of campaign scope.
2. qt6-fourier on other workloads. This campaign rules out benefit for bbb 1080p H.264 60s in chromium-fourier; doesn't say anything about Firefox, mpv, mixed Plasma desktop activity, or different video formats. If the user wants qt6-fourier maintained, it'd be on the merits of a different workload set.
3. Cell C had wider rep-to-rep variance than expected (drops_60s 5/10/14, browser_cpu_median 52.2/54.15/60.2). May be ambient drift in the new session post-package-swap; not enough to change the verdict but flagged for honesty.
4. All-off cell. Not measured. Combined effect of kwin+qt6+chromium being all reverted not in matrix; predecessor evidence implies it'd be ≈cell D (kwin dominant) but unknown.

• *Single-toggle attribution matrix on small N=3 with clean ambient is enough to rank fourier-flavoured packages by impact on a specific workload* — this campaign in 4 hours gave answers the original fourier campaign hadn't separated in months of “fix this fix that”.
• *kwin-fourier `watchDmaBuf` fix is the load-bearing one for video on rockchip* (RK3568). Removing it is the failure mode. Should not be removed casually.
• *qt6-fourier GL_ALPHA fix may not bind on workloads that don't trigger it.* Don't ship it as critical without identifying the workloads where it actually helps.
• *Brave-vs-Chromium version confound in matrix design* — when “package off” requires using a different upstream binary, document the version skew explicitly and note it as a confound; don't pretend the swap is clean.

REP_ID=a_rep1
KIND=chromium-fourier-kwin
end_seen=True
trajectory_samples=71
--- drops ---
drops_5s=10
drops_60s=17
drops_post_5s=7
frames_5s=124
frames_60s=1448
effective_fps=24.01
--- kwin_wayland CPU%% (5s-65s) ---
kwin_cpu_n=60
kwin_cpu_median=11.0
kwin_cpu_mean=11.65
kwin_cpu_min=9.9
kwin_cpu_max=19.0
kwin_cpu_p25=11.0
kwin_cpu_p75=12.0
kwin_cpu_iqr=1.0
--- chrome aggregate CPU%% (5s-65s) ---
browser_cpu_n=60
browser_cpu_median=54.25
browser_cpu_mean=58.59
browser_cpu_min=49.1
browser_cpu_max=115.7
browser_cpu_p25=52.2
browser_cpu_p75=59.1
browser_cpu_iqr=6.9
--- panfrost devfreq (window) ---
panfrost_total_window_ms=74681
panfrost_mean_freq_mhz=596.4
panfrost_peak_freq_pct=35.1
panfrost_residency_200MHz_ms=1356
panfrost_residency_300MHz_ms=485
panfrost_residency_400MHz_ms=25080
panfrost_residency_600MHz_ms=19625
panfrost_residency_700MHz_ms=1897
panfrost_residency_800MHz_ms=26238
--- thermal ---
therm_pre_milliC=46111
therm_post_milliC=57222
therm_drift_c=11.1

REP_ID=a_rep2
KIND=chromium-fourier-kwin
end_seen=True
trajectory_samples=71
--- drops ---
drops_5s=5
drops_60s=12
drops_post_5s=7
frames_5s=124
frames_60s=1447
effective_fps=24.01
--- kwin_wayland CPU%% (5s-65s) ---
kwin_cpu_n=60
kwin_cpu_median=12.0
kwin_cpu_mean=12.16
kwin_cpu_min=10.0
kwin_cpu_max=17.0
kwin_cpu_p25=11.0
kwin_cpu_p75=13.0
kwin_cpu_iqr=2.0
--- chrome aggregate CPU%% (5s-65s) ---
browser_cpu_n=60
browser_cpu_median=54.4
browser_cpu_mean=59.76
browser_cpu_min=49.4
browser_cpu_max=115.7
browser_cpu_p25=53.0
browser_cpu_p75=60.0
browser_cpu_iqr=7.0
--- panfrost devfreq (window) ---
panfrost_total_window_ms=73875
panfrost_mean_freq_mhz=607.2
panfrost_peak_freq_pct=36.2
panfrost_residency_200MHz_ms=1294
panfrost_residency_300MHz_ms=207
panfrost_residency_400MHz_ms=22356
panfrost_residency_600MHz_ms=20947
panfrost_residency_700MHz_ms=2314
panfrost_residency_800MHz_ms=26757
--- thermal ---
therm_pre_milliC=47777
therm_post_milliC=59444
therm_drift_c=11.7

REP_ID=a_rep3
KIND=chromium-fourier-kwin
end_seen=True
trajectory_samples=71
--- drops ---
drops_5s=5
drops_60s=8
drops_post_5s=3
frames_5s=125
frames_60s=1448
effective_fps=24.0
--- kwin_wayland CPU%% (5s-65s) ---
kwin_cpu_n=60
kwin_cpu_median=11.0
kwin_cpu_mean=11.51
kwin_cpu_min=10.0
kwin_cpu_max=17.0
kwin_cpu_p25=11.0
kwin_cpu_p75=12.0
kwin_cpu_iqr=1.0
--- chrome aggregate CPU%% (5s-65s) ---
browser_cpu_n=60
browser_cpu_median=54.9
browser_cpu_mean=58.36
browser_cpu_min=49.3
browser_cpu_max=124.8
browser_cpu_p25=52.4
browser_cpu_p75=57.3
browser_cpu_iqr=4.9
--- panfrost devfreq (window) ---
panfrost_total_window_ms=74432
panfrost_mean_freq_mhz=606.8
panfrost_peak_freq_pct=35.9
panfrost_residency_200MHz_ms=1302
panfrost_residency_300MHz_ms=309
panfrost_residency_400MHz_ms=21911
panfrost_residency_600MHz_ms=22616
panfrost_residency_700MHz_ms=1545
panfrost_residency_800MHz_ms=26749
--- thermal ---
therm_pre_milliC=50625
therm_post_milliC=58333
therm_drift_c=7.7

REP_ID=b_rep1
KIND=brave-kwin
end_seen=True
trajectory_samples=71
--- drops ---
drops_5s=15
drops_60s=16
drops_post_5s=1
frames_5s=123
frames_60s=1414
effective_fps=23.43
--- kwin_wayland CPU%% (5s-65s) ---
kwin_cpu_n=60
kwin_cpu_median=12.9
kwin_cpu_mean=12.5
kwin_cpu_min=8.9
kwin_cpu_max=16.0
kwin_cpu_p25=11.9
kwin_cpu_p75=13.0
kwin_cpu_iqr=1.1
--- brave aggregate CPU%% (5s-65s) ---
browser_cpu_n=60
browser_cpu_median=137.3
browser_cpu_mean=151.89
browser_cpu_min=92.3
browser_cpu_max=240.9
browser_cpu_p25=125.2
browser_cpu_p75=183.1
browser_cpu_iqr=57.9
--- panfrost devfreq (window) ---
panfrost_total_window_ms=73944
panfrost_mean_freq_mhz=596.2
panfrost_peak_freq_pct=35.9
panfrost_residency_200MHz_ms=2321
panfrost_residency_300MHz_ms=1196
panfrost_residency_400MHz_ms=22807
panfrost_residency_600MHz_ms=18447
panfrost_residency_700MHz_ms=2649
panfrost_residency_800MHz_ms=26524
--- thermal ---
therm_pre_milliC=48333
therm_post_milliC=60555
therm_drift_c=12.2

REP_ID=b_rep2
KIND=brave-kwin
end_seen=True
trajectory_samples=71
--- drops ---
drops_5s=8
drops_60s=11
drops_post_5s=3
frames_5s=115
frames_60s=1392
effective_fps=23.18
--- kwin_wayland CPU%% (5s-65s) ---
kwin_cpu_n=60
kwin_cpu_median=13.0
kwin_cpu_mean=12.99
kwin_cpu_min=9.0
kwin_cpu_max=16.0
kwin_cpu_p25=12.0
kwin_cpu_p75=14.0
kwin_cpu_iqr=2.0
--- brave aggregate CPU%% (5s-65s) ---
browser_cpu_n=60
browser_cpu_median=140.65
browser_cpu_mean=151.2
browser_cpu_min=93.0
browser_cpu_max=258.8
browser_cpu_p25=124.6
browser_cpu_p75=176.4
browser_cpu_iqr=51.8
--- panfrost devfreq (window) ---
panfrost_total_window_ms=75308
panfrost_mean_freq_mhz=605.7
panfrost_peak_freq_pct=36.5
panfrost_residency_200MHz_ms=2427
panfrost_residency_300MHz_ms=1224
panfrost_residency_400MHz_ms=20508
panfrost_residency_600MHz_ms=19969
panfrost_residency_700MHz_ms=3684
panfrost_residency_800MHz_ms=27496
--- thermal ---
therm_pre_milliC=48888
therm_post_milliC=61666
therm_drift_c=12.8

REP_ID=b_rep3
KIND=brave-kwin
end_seen=True
trajectory_samples=71
--- drops ---
drops_5s=11
drops_60s=18
drops_post_5s=7
frames_5s=104
frames_60s=1367
effective_fps=22.91
--- kwin_wayland CPU%% (5s-65s) ---
kwin_cpu_n=60
kwin_cpu_median=13.0
kwin_cpu_mean=12.96
kwin_cpu_min=9.0
kwin_cpu_max=19.9
kwin_cpu_p25=12.0
kwin_cpu_p75=14.0
kwin_cpu_iqr=2.0
--- brave aggregate CPU%% (5s-65s) ---
browser_cpu_n=60
browser_cpu_median=137.15
browser_cpu_mean=155.17
browser_cpu_min=98.8
browser_cpu_max=286.0
browser_cpu_p25=127.5
browser_cpu_p75=177.7
browser_cpu_iqr=50.2
--- panfrost devfreq (window) ---
panfrost_total_window_ms=75129
panfrost_mean_freq_mhz=605.4
panfrost_peak_freq_pct=36.9
panfrost_residency_200MHz_ms=3629
panfrost_residency_300MHz_ms=1270
panfrost_residency_400MHz_ms=18742
panfrost_residency_600MHz_ms=19345
panfrost_residency_700MHz_ms=4434
panfrost_residency_800MHz_ms=27709
--- thermal ---
therm_pre_milliC=52500
therm_post_milliC=61111
therm_drift_c=8.6

REP_ID=c_rep1
KIND=chromium-fourier-kwin
end_seen=True
trajectory_samples=71
--- drops ---
drops_5s=11
drops_60s=14
drops_post_5s=3
frames_5s=125
frames_60s=1449
effective_fps=24.0
--- kwin_wayland CPU%% (5s-65s) ---
kwin_cpu_n=60
kwin_cpu_median=12.0
kwin_cpu_mean=11.76
kwin_cpu_min=10.0
kwin_cpu_max=16.0
kwin_cpu_p25=11.0
kwin_cpu_p75=12.0
kwin_cpu_iqr=1.0
--- chrome aggregate CPU%% (5s-65s) ---
browser_cpu_n=60
browser_cpu_median=60.2
browser_cpu_mean=62.12
browser_cpu_min=49.8
browser_cpu_max=115.1
browser_cpu_p25=57.6
browser_cpu_p75=63.3
browser_cpu_iqr=5.7
--- panfrost devfreq (window) ---
panfrost_total_window_ms=76199
panfrost_mean_freq_mhz=596.7
panfrost_peak_freq_pct=35.4
panfrost_residency_200MHz_ms=2551
panfrost_residency_300MHz_ms=1297
panfrost_residency_400MHz_ms=22910
panfrost_residency_600MHz_ms=19041
panfrost_residency_700MHz_ms=3415
panfrost_residency_800MHz_ms=26985
--- thermal ---
therm_pre_milliC=50625
therm_post_milliC=63333
therm_drift_c=12.7

REP_ID=c_rep2
KIND=chromium-fourier-kwin
end_seen=True
trajectory_samples=71
--- drops ---
drops_5s=7
drops_60s=10
drops_post_5s=3
frames_5s=125
frames_60s=1449
effective_fps=24.01
--- kwin_wayland CPU%% (5s-65s) ---
kwin_cpu_n=60
kwin_cpu_median=11.0
kwin_cpu_mean=11.24
kwin_cpu_min=9.0
kwin_cpu_max=16.0
kwin_cpu_p25=10.9
kwin_cpu_p75=12.0
kwin_cpu_iqr=1.1
--- chrome aggregate CPU%% (5s-65s) ---
browser_cpu_n=60
browser_cpu_median=54.15
browser_cpu_mean=58.84
browser_cpu_min=49.3
browser_cpu_max=184.9
browser_cpu_p25=52.3
browser_cpu_p75=57.7
browser_cpu_iqr=5.4
--- panfrost devfreq (window) ---
panfrost_total_window_ms=74799
panfrost_mean_freq_mhz=590.7
panfrost_peak_freq_pct=34.0
panfrost_residency_200MHz_ms=1860
panfrost_residency_300MHz_ms=416
panfrost_residency_400MHz_ms=25766
panfrost_residency_600MHz_ms=18917
panfrost_residency_700MHz_ms=2379
panfrost_residency_800MHz_ms=25461
--- thermal ---
therm_pre_milliC=58333
therm_post_milliC=63333
therm_drift_c=5.0

REP_ID=c_rep3
KIND=chromium-fourier-kwin
end_seen=True
trajectory_samples=71
--- drops ---
drops_5s=5
drops_60s=5
drops_post_5s=0
frames_5s=125
frames_60s=1447
effective_fps=23.98
--- kwin_wayland CPU%% (5s-65s) ---
kwin_cpu_n=60
kwin_cpu_median=11.0
kwin_cpu_mean=10.96
kwin_cpu_min=9.0
kwin_cpu_max=15.0
kwin_cpu_p25=11.0
kwin_cpu_p75=11.0
kwin_cpu_iqr=0.0
--- chrome aggregate CPU%% (5s-65s) ---
browser_cpu_n=60
browser_cpu_median=52.2
browser_cpu_mean=54.9
browser_cpu_min=46.7
browser_cpu_max=135.9
browser_cpu_p25=51.1
browser_cpu_p75=55.2
browser_cpu_iqr=4.1
--- panfrost devfreq (window) ---
panfrost_total_window_ms=73269
panfrost_mean_freq_mhz=595.6
panfrost_peak_freq_pct=33.5
panfrost_residency_200MHz_ms=1681
panfrost_residency_300MHz_ms=311
panfrost_residency_400MHz_ms=23541
panfrost_residency_600MHz_ms=20735
panfrost_residency_700MHz_ms=2468
panfrost_residency_800MHz_ms=24533
--- thermal ---
therm_pre_milliC=50000
therm_post_milliC=61666
therm_drift_c=11.7

REP_ID=d_rep1
KIND=chromium-fourier-kwin
end_seen=True
trajectory_samples=71
--- drops ---
drops_5s=9
drops_60s=21
drops_post_5s=12
frames_5s=124
frames_60s=1448
effective_fps=23.99
--- kwin_wayland CPU%% (5s-65s) ---
kwin_cpu_n=60
kwin_cpu_median=32.9
kwin_cpu_mean=33.44
kwin_cpu_min=30.8
kwin_cpu_max=39.9
kwin_cpu_p25=32.8
kwin_cpu_p75=33.9
kwin_cpu_iqr=1.1
--- chrome aggregate CPU%% (5s-65s) ---
browser_cpu_n=60
browser_cpu_median=64.25
browser_cpu_mean=68.74
browser_cpu_min=57.0
browser_cpu_max=107.9
browser_cpu_p25=61.2
browser_cpu_p75=71.6
browser_cpu_iqr=10.4
--- panfrost devfreq (window) ---
panfrost_total_window_ms=75111
panfrost_mean_freq_mhz=783.2
panfrost_peak_freq_pct=95.2
panfrost_residency_200MHz_ms=1369
panfrost_residency_300MHz_ms=103
panfrost_residency_400MHz_ms=208
panfrost_residency_600MHz_ms=1134
panfrost_residency_700MHz_ms=780
panfrost_residency_800MHz_ms=71517
--- thermal ---
therm_pre_milliC=45555
therm_post_milliC=62777
therm_drift_c=17.2

REP_ID=d_rep2
KIND=chromium-fourier-kwin
end_seen=True
trajectory_samples=71
--- drops ---
drops_5s=10
drops_60s=24
drops_post_5s=14
frames_5s=124
frames_60s=1448
effective_fps=23.99
--- kwin_wayland CPU%% (5s-65s) ---
kwin_cpu_n=60
kwin_cpu_median=32.9
kwin_cpu_mean=33.14
kwin_cpu_min=29.7
kwin_cpu_max=38.8
kwin_cpu_p25=31.9
kwin_cpu_p75=33.9
kwin_cpu_iqr=2.0
--- chrome aggregate CPU%% (5s-65s) ---
browser_cpu_n=60
browser_cpu_median=63.3
browser_cpu_mean=68.91
browser_cpu_min=56.2
browser_cpu_max=127.7
browser_cpu_p25=61.2
browser_cpu_p75=67.6
browser_cpu_iqr=6.4
--- panfrost devfreq (window) ---
panfrost_total_window_ms=79234
panfrost_mean_freq_mhz=777.2
panfrost_peak_freq_pct=93.7
panfrost_residency_200MHz_ms=161
panfrost_residency_300MHz_ms=105
panfrost_residency_400MHz_ms=3715
panfrost_residency_600MHz_ms=727
panfrost_residency_700MHz_ms=261
panfrost_residency_800MHz_ms=74265
--- thermal ---
therm_pre_milliC=53750
therm_post_milliC=61666
therm_drift_c=7.9

REP_ID=d_rep3
KIND=chromium-fourier-kwin
end_seen=True
trajectory_samples=71
--- drops ---
drops_5s=16
drops_60s=25
drops_post_5s=9
frames_5s=124
frames_60s=1447
effective_fps=23.99
--- kwin_wayland CPU%% (5s-65s) ---
kwin_cpu_n=60
kwin_cpu_median=32.9
kwin_cpu_mean=33.03
kwin_cpu_min=27.9
kwin_cpu_max=40.2
kwin_cpu_p25=31.9
kwin_cpu_p75=33.9
kwin_cpu_iqr=2.0
--- chrome aggregate CPU%% (5s-65s) ---
browser_cpu_n=60
browser_cpu_median=64.05
browser_cpu_mean=70.36
browser_cpu_min=58.0
browser_cpu_max=148.0
browser_cpu_p25=62.1
browser_cpu_p75=70.9
browser_cpu_iqr=8.8
--- panfrost devfreq (window) ---
panfrost_total_window_ms=78666
panfrost_mean_freq_mhz=774.5
panfrost_peak_freq_pct=93.3
panfrost_residency_200MHz_ms=326
panfrost_residency_300MHz_ms=463
panfrost_residency_400MHz_ms=3576
panfrost_residency_600MHz_ms=621
panfrost_residency_700MHz_ms=262
panfrost_residency_800MHz_ms=73418
--- thermal ---
therm_pre_milliC=56111
therm_post_milliC=63333
therm_drift_c=7.2

2026-05-03T21:09:44Z
REP_ID=a_rep1 KIND=chromium-fourier-kwin
BROWSER_BIN=/tmp/chromium-ohm-gl-fix-step2/chrome
Chromium 149.0.7812.0 
qt6-base-fourier 1:6.11.0-3
qt6-base-fourier 1:6.11.0-3
kwin-fourier 1:6.6.4-3
kwin-fourier 1:6.6.4-3
6.19.10-danctnix1-1-pinetab2
workload_pid=67340
workload_pgid=67340
script_pgid=67329
AUTOPLAY at 2026-05-03T21:09:49Z (took 5 s)
kwin_wayland_pid=53655

2026-05-03T21:14:21Z
REP_ID=b_rep1 KIND=brave-kwin
BROWSER_BIN=/usr/bin/brave
Brave Browser 147.1.89.145 
qt6-base-fourier 1:6.11.0-3
qt6-base-fourier 1:6.11.0-3
kwin-fourier 1:6.6.4-3
kwin-fourier 1:6.6.4-3
6.19.10-danctnix1-1-pinetab2
workload_pid=69443
workload_pgid=69443
script_pgid=69432
AUTOPLAY at 2026-05-03T21:14:26Z (took 5 s)
kwin_wayland_pid=53655

2026-05-03T22:01:37Z
REP_ID=c_rep1 KIND=chromium-fourier-kwin
BROWSER_BIN=/tmp/chromium-ohm-gl-fix-step2/chrome
Chromium 149.0.7812.0 
qt6-base 6.11.0-2
kwin-fourier 1:6.6.4-3
kwin-fourier 1:6.6.4-3
6.19.10-danctnix1-1-pinetab2
workload_pid=82947
workload_pgid=82947
script_pgid=82936
AUTOPLAY at 2026-05-03T22:01:43Z (took 6 s)
kwin_wayland_pid=82420

2026-05-03T21:50:32Z
REP_ID=d_rep1 KIND=chromium-fourier-kwin
BROWSER_BIN=/tmp/chromium-ohm-gl-fix-step2/chrome
Chromium 149.0.7812.0 
qt6-base-fourier 1:6.11.0-3
qt6-base-fourier 1:6.11.0-3
kwin 6.6.4-1
6.19.10-danctnix1-1-pinetab2
workload_pid=79834
workload_pgid=79834
script_pgid=79823
AUTOPLAY at 2026-05-03T21:50:37Z (took 5 s)
kwin_wayland_pid=77581

Per Phase 5 of the dev process: Claude is forbidden from curating this artifact. The reviewer is asked to read the raw documents above and surface anything the active session may have rationalised away — methodology gaps, threshold-setting bias, confounds the campaign acknowledged but didn't quantify (e.g. Brave-vs-Chromium-149 version delta in cell B), and any path from this matrix to a useful next campaign.