marfrit
489d6e3862
iter9 of the panvk-bifrost campaign — operator-confirmed Vulkan output
on PineTab2 (Mali-G52 r1 MC1) 2026-05-20.
Patches Mesa 26.0.6's PanVk Vulkan driver:
- VK_KHR/EXT_robustness2 + nullDescriptor exposed for PAN_ARCH 6/7
- has_vk1_1 / has_vk1_2 = true on Bifrost
Patches applied via sed in PKGBUILD prepare() (cleaner than maintaining
a Mesa fork for two two-line tweaks; upstream context drifts between
Mesa releases would make a literal .patch brittle).
Co-installs at /usr/lib/panvk-bifrost/ — stock mesa untouched. Stock
libvulkan_panfrost.so and its ICD JSON keep working for everyone not
opting into the patched driver.
Ships /usr/bin/brave-vulkan that wires up:
VK_ICD_FILENAMES=/usr/lib/panvk-bifrost/icd.json
PAN_I_WANT_A_BROKEN_VULKAN_DRIVER=1
MESA_VK_VERSION_OVERRIDE=1.2 # ANGLE needs apiVersion>=1.1; the
# has_vk1_x flags don't move it, so
# the env-var override carries that
brave --use-gl=disabled --enable-features=Vulkan --use-vulkan=native
--ozone-platform=x11 --no-sandbox --disable-gpu-sandbox
--ignore-gpu-blocklist "$@"
Side-steps the stock "GLES3 is unsupported / GPU process exits" failure
documented in panvk-bifrost/README's "Consumer-side benefit" section.
Known limitation: WebGL/WebGL2 in-page won't work — ANGLE needs GLES3
which needs VK_EXT_transform_feedback, which PanVk-Bifrost doesn't
currently support. Browser chrome + standard page rendering work fine.
Gitea Actions job mesa-panvk-bifrost-aarch64 added to build.yml,
patterned on libva-v4l2-request-fourier-aarch64. Mesa build is slow
(~30-60min on actrunner-aarch64). Standalone (no needs:),
continue-on-error so it doesn't block other jobs.
Campaign artifacts: ~/src/panvk-bifrost/{README.md, phase8_iteration9_close.md,
phase0_evidence/iter9_brave_vulkan_breakthrough.txt}.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
62 lines
2.1 KiB
Bash
62 lines
2.1 KiB
Bash
#!/bin/bash
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# brave-vulkan — launch Brave with the PanVk-Bifrost Vulkan compositor on
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# Bifrost SBCs (PineTab2 / Mali-G52 r1 MC1 and similar).
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#
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# Side-steps the GL stack failures stock Brave hits on Bifrost
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# (the README "Consumer-side benefit" path of the panvk-bifrost campaign).
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#
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# Provided by the mesa-panvk-bifrost package. See:
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# /usr/share/doc/mesa-panvk-bifrost/README
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# ~/src/panvk-bifrost/phase8_iteration9_close.md (campaign close)
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#
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# Usage: brave-vulkan [brave args...]
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# Equivalent to: brave [VULKAN_FLAGS] [your args]
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set -e
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# Patched Vulkan driver (from this package) — must point at the custom path
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# so we don't clash with the stock /usr/share/vulkan/icd.d/panfrost_icd.json
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export VK_ICD_FILENAMES=/usr/lib/panvk-bifrost/icd.json
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# PanVk's "I know it's not conformant" gate — the patched driver still
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# refuses to enumerate Bifrost without this env var (Mesa upstream choice,
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# kept for compatibility).
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export PAN_I_WANT_A_BROKEN_VULKAN_DRIVER=1
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# Override apiVersion to 1.2 — ANGLE (Chromium's GL stack) requires
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# device.apiVersion >= 1.1. The patched libvulkan_panfrost.so still has
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# a PAN_ARCH>=10 gate inside get_api_version(); easier to override at
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# runtime via this Mesa env var than to add a third patch.
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export MESA_VK_VERSION_OVERRIDE=1.2
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# Find the live Plasma session's Xauthority. On a fresh boot the suffix
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# is randomized; pgrep the Xwayland args to find the current one.
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if [ -z "${XAUTHORITY:-}" ]; then
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XAUTHF=$(pgrep -fa Xwayland 2>/dev/null | grep -oE "/run/user/$(id -u)/xauth_[A-Za-z0-9]+" | head -1)
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if [ -n "$XAUTHF" ]; then
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export XAUTHORITY="$XAUTHF"
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fi
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fi
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# Standard session env if not already set
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: "${XDG_RUNTIME_DIR:=/run/user/$(id -u)}"
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export XDG_RUNTIME_DIR
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# Default to the active Plasma Wayland session if WAYLAND_DISPLAY unset
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: "${WAYLAND_DISPLAY:=wayland-0}"
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export WAYLAND_DISPLAY
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# Default to the XWayland :1 unless DISPLAY is set
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: "${DISPLAY:=:1}"
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export DISPLAY
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exec brave \
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--use-gl=disabled \
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--enable-features=Vulkan \
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--use-vulkan=native \
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--ozone-platform=x11 \
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--no-sandbox \
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--disable-gpu-sandbox \
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--ignore-gpu-blocklist \
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"$@"
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