Phase 0 X1: native X11 baseline + mpv mechanism probes — campaign hypothesis refuted

Native X11 in XFCE / xfwm4-no-comp on tty7 / session 510. Q1 (mechanism: does X server route NV12 to a hardware plane?): NEGATIVE. Across 4 mpv VO × decode combinations (--vo=xv ± hwdec, --vo=gpu ± hwdec), Plane 39 stayed XRGB8888 with FB ID 62 throughout. mpv-xv falls back to XShm software put-image; mpv-gpu does GL composite via DRI3 + XPresent of an RGB framebuffer; chromium-fourier-x11 same shape. No path on this rockchip-drm + Mesa Panfrost + modesetting Xorg stack engages hardware-overlay scanout for an NV12 client. Q4 (browser X11 vs Wayland on same workload): the campaign hypothesis is OPPOSITE to the data. chromium-fourier-x11 ×3 median: drops_post_warmup=9, frames_total=1532, fps=21.8. Compare to A1 Wayland ×3 median: drops_post_warmup=0, frames_total=1685, fps=24.04. X11 + xfwm4-no-comp is worse than Plasma Wayland-with-KWin on every metric. Likely cause: KWin's vblank-aligned wp_presentation_feedback buffer scheduling absorbs client timing jitter; X11 + no compositor exposes that jitter directly to the page's getVideoPlaybackQuality() drop counter. Operator subjective note: "first mpv was perfect" for mpv-xv-sw despite mpv stderr "X11 can't keep up". 1080p24 SW Xv is perceptually smooth on this hardware even though instrumentation flagged it as struggling. x1_summary.md surfaces three legitimate next moves: honest closure, reframe to operator-experience-driven Wayland-stutter scenarios, or pivot to client/driver-layer mechanism work (modesetting NV12 Xv adapter, chromium hw-overlay flags). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-03 18:46:03 +00:00
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+=== uname/date/uptime ===
+Linux ohm 6.19.10-danctnix1-1-pinetab2 #1 SMP PREEMPT_DYNAMIC Sat, 28 Mar 2026 02:45:08 +0000 aarch64 GNU/Linux
+2026-05-03T20:19:32+02:00
+ 20:19:32 up 1 day,  4:45,  4 users,  load average: 0.69, 0.68, 0.39
+
+=== loginctl session 510 ===
+Id=510
+User=1001
+Name=mfritsche
+Timestamp=Sun 2026-05-03 20:17:35 CEST
+TimestampMonotonic=103312669497
+VTNr=7
+Seat=seat0
+TTY=tty7
+Remote=no
+Service=sddm
+Desktop=XFCE
+Scope=session-510.scope
+Leader=45212
+LeaderPIDFDId=45213
+Audit=510
+Type=x11
+Class=user
+Active=yes
+State=active
+IdleHint=no
+IdleSinceHint=0
+IdleSinceHintMonotonic=0
+CanIdle=yes
+CanLock=yes
+LockedHint=no
+
+=== Xorg cmdline ===
+/usr/lib/Xorg -nolisten tcp -background none -seat seat0 -noreset -keeptty -novtswitch -verbose 3 -auth /run/user/1001/xauth_clPcKW -displayfd 13 vt7 
+
+=== xfwm4 cmdline ===
+xfwm4 
+
+=== xfwm4 use_compositing ===
+false
+
+=== full process tree ===
+  35593       1 root     /usr/bin/sddm
+  44641   24321 mfritsc+ /usr/lib/xdg-desktop-portal
+  45212   35593 root     /usr/lib/sddm/sddm-helper --socket /tmp/sddm-auth-4b4ea02e-2743-406a-b7b4-cb9c61966af4 --id 4 --start startxfce4 --user mfritsche --display-server /usr/bin/X -nolisten tcp -background none -seat seat0 -noreset -keeptty -novtswitch -verbose 3
+  45220   45212 mfritsc+ /usr/lib/sddm/sddm-helper-start-x11user /usr/bin/X -nolisten tcp -background none -seat seat0 -noreset -keeptty -novtswitch -verbose 3 /usr/share/sddm/scripts/Xsession "startxfce4"
+  45263   45220 root     /usr/lib/Xorg -nolisten tcp -background none -seat seat0 -noreset -keeptty -novtswitch -verbose 3 -auth /run/user/1001/xauth_clPcKW -displayfd 13 vt7
+  45276   45220 mfritsc+ xfce4-session
+  45321   24321 mfritsc+ /usr/lib/xfce4/xfconf/xfconfd
+  45342   45276 mfritsc+ xfwm4
+  45365   45276 mfritsc+ xfsettingsd
+  45374   45276 mfritsc+ xfce4-panel
+  45395   45276 mfritsc+ xfdesktop
+  45458   45374 mfritsc+ /usr/lib/xfce4/panel/wrapper-2.0 /usr/lib/xfce4/panel/plugins/libsystray.so 6 10485772 systray Status Tray Plugin Provides status notifier items (application indicators) and legacy systray items
+  45467   45276 mfritsc+ xfce4-power-manager
+  45482   24321 mfritsc+ /usr/lib/xfce4/notifyd/xfce4-notifyd
+  45491   45374 mfritsc+ /usr/lib/xfce4/panel/wrapper-2.0 /usr/lib/xfce4/panel/plugins/libactions.so 10 10485773 actions Action Buttons Log out, lock or other system actions
+  45585   24321 mfritsc+ /usr/lib/xdg-desktop-portal-gtk
+  45821       1 mfritsc+ /usr/bin/xfce4-terminal
+
+=== thermal ===
+/sys/class/thermal/thermal_zone0: cpu-thermal = 44375
+/sys/class/thermal/thermal_zone1: gpu-thermal = 40625
+
+=== governor ===
+performance
+
+=== xrandr ===
+Screen 0: minimum 320 x 200, current 1280 x 800, maximum 4096 x 2304
+HDMI-1 disconnected (normal left inverted right x axis y axis)
+DSI-1 connected 1280x800+0+0 right (normal left inverted right x axis y axis) 0mm x 0mm
+   800x1280      59.98*+
+
+=== xdpyinfo extensions (top 15) ===
+number of extensions:    28
+    BIG-REQUESTS
+    Composite
+    DAMAGE
+    DOUBLE-BUFFER
+    DPMS
+    DRI2
+    DRI3
+    GLX
+    Generic Event Extension
+    MIT-SCREEN-SAVER
+    MIT-SHM
+    Present
+    RANDR
+    RECORD
+    RENDER
+    SECURITY
+    SHAPE
+    SYNC
+    X-Resource
+    XC-MISC
+    XFIXES
+    XFree86-DGA
+    XFree86-VidModeExtension
+    XINERAMA
+    XInputExtension
+    XKEYBOARD
+    XTEST
+    XVideo
+default screen number:    0
+number of screens:    1
+
+=== xvinfo (XVideo adapter) — critical for mpv --vo=xv ===
+bash: line 12: xvinfo: command not found
+
+=== drm_info Plane 39 + Plane 45 baseline (no chrome/mpv running) ===
+    │   ├───Object ID: 39
+    │   ├───CRTCs: {1}
+    │   ├───Legacy info
+    │   │   ├───FB ID: 62
+    │   │   │   ├───Object ID: 62
+--
+        ├───Object ID: 45
+        ├───CRTCs: {0, 1}
+        ├───Legacy info
+        │   ├───FB ID: 0
+        │   └───Formats:
+
+=== devfreq (GPU) availability ===
+fde60000.gpu
+/sys/class/devfreq/fde60000.gpu: fde60000.gpu cur_freq=300000000