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f115fa6cbc1d428e39a9569ed3a9540fbc58d1ae
libva-multiplanar/phase0_evidence/2026-05-04-firefox/firefox_stderr
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marfrit f115fa6cbc Phase 0 deliverable #3 (Firefox): headless-rig finding 
Firefox 150.0.1 + media.ffmpeg.vaapi.enabled=true + LIBVA_DRIVER_NAME=
v4l2_request, executed under Xvfb on ohm.

Result: inconclusive at the boolean-correctness level. RDD process
dlopens libva.so.2 + libva-drm.so.2 + libva-x11.so.2 for capability
probe then immediately closes them; never reaches vaInitialize, never
opens /dev/dri/renderD128, never reaches v4l2_request_drv_video.so.
Falls back to software H.264 in RDD via FFmpeg-OS-library PDM
(Broadcast support from 'RDD', support=H264 SWDEC).

Root cause: Xvfb provides software framebuffer with no DRI/DRM
render-node integration. Firefox's gfx-environment platform-fitness
check rejects VAAPI before adding it to the RDD PDM order list.
Not a libva-side or driver-side fault — mpv --hwdec=vaapi-copy in
the same headless rig DID engage end-to-end (per
phase0_evidence/2026-05-04/findings.md).

Definitive Firefox verdict requires retesting inside a live Plasma
session — deferred to live-session run (next commit).

Also: Phase 0 deliverable #2 (Step 1 reconciliation into fork
master) was completed and pushed to marfrit/libva-v4l2-request-fourier
between this and the prior Phase 0 commit; status table updated.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-04 10:19:14 +00:00

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[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:05.825: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:05.833: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Unnamed thread ffff5944c160] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:05.854: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:08.071: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:08.074: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Unnamed thread ffff5944c160] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:08.076: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:08.078: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:08.080: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Main Thread] WARNING: Failed to create DBus proxy for org.a11y.Bus: Error spawning command line “dbus-launch --autolaunch=78e6542cc23a48ccbdbdf5cb05f4fbf0 --binary-syntax --close-stderr”: Child process exited with code 1
: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
** (firefox:143578): WARNING **: 12:03:09.291: Failed to create DBus proxy for org.a11y.Bus: Error spawning command line “dbus-launch --autolaunch=78e6542cc23a48ccbdbdf5cb05f4fbf0 --binary-syntax --close-stderr”: Child process exited with code 1
[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:11.126: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:11.130: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:12.048: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:12.050: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:14.335: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:14.338: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Unnamed thread ffff5944c160] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:14.341: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:14.352: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Unnamed thread ffff5944c160] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:14.355: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:14.358: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:14.362: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:14.372: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Unnamed thread ffff5944c160] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:14.376: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:14.379: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:17.672: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:17.679: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:23.164: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:23.180: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:27.041: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:27.051: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:28.557: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
[Parent 143578, Main Thread] WARNING: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.: 'glib warning', file /build/firefox/src/firefox-150.0.1/toolkit/xre/nsSigHandlers.cpp:201
(firefox:143578): dconf-CRITICAL **: 12:03:28.562: unable to create directory '/run/user/1000/dconf': Permission denied. dconf will not work properly.
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