feat(surface-arm64-audio): Qualcomm LPASS/Q6DSP audio for Surface Laptop 7

2026/surface-arm64-ci.yml

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+# Surface Laptop 7 arm64 Containerfile build validation
+# Saved to 2026/ per yubi-OS convention (no workflow scope required).
+# Jenny: copy to .github/workflows/ to activate.
+name: surface-arm64 build
+
+on:
+  push:
+    branches: [feature/surface-arm64-snapdragon, feature/surface-arm64-audio]
+    paths: ['contrib/surface/arm64/**']
+  pull_request:
+    branches: [main]
+    paths: ['contrib/surface/arm64/**']
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683  # v4
+
+      - name: Set up QEMU (arm64 cross-build)
+        uses: docker/setup-qemu-action@29109295f81e9208d7d86ff9c43a07b67cd1ff5b  # v3
+        with:
+          platforms: arm64
+
+      - name: Set up Buildx
+        uses: docker/setup-buildx-action@b5730b0989851c622c265c3e5b2c4e8ab10c181e  # v3
+
+      - name: Build surface-arm64 (no push)
+        uses: docker/build-push-action@471d1dc4e07e5cdedd4c2171150001c2b685f1dc  # v6
+        with:
+          context: contrib/surface/arm64
+          file: contrib/surface/arm64/Containerfile.fedora
+          platforms: linux/arm64
+          push: false
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          provenance: false
+
+      - name: Lint bootc image
+        if: github.event_name == 'pull_request'
+        run: |
+          docker run --rm \
+            --platform linux/arm64 \
+            --security-opt label=disable \
+            surface-arm64:latest \
+            bootc container lint || true

contrib/surface/arm64/Containerfile.fedora

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+# Surface Laptop 7 (Snapdragon X Elite, aarch64) bootc image - Fedora base
+# Includes Qualcomm LPASS/Q6DSP audio support.
+#
+# Build (native aarch64 or cross from x86-64 with QEMU binfmt):
+#   podman build --platform linux/arm64 -f Containerfile.fedora -t surface-arm64 .
+#
+# Install to disk:
+#   podman run --rm --privileged --pid=host \
+#     -v /dev:/dev -v /var/lib/containers:/var/lib/containers \
+#     surface-arm64 bootc install to-disk /dev/nvme0n1
+
+FROM quay.io/fedora/fedora-bootc:42@sha256:2066df85e559d50753c4faf3dcb692610c3113f0815b8f3e8f0b87358f69dd9c
+
+LABEL containers.bootc=1
+
+RUN dnf install -y \
+      kernel-core \
+      kernel-modules \
+      kernel-modules-extra \
+      qrtr-tools \
+      pd-mapper \
+      linux-firmware \
+      tpm2-tools tpm2-tss \
+      sbctl efivar efitools \
+      alsa-utils \
+      alsa-ucm-conf \
+      pipewire \
+      wireplumber \
+      pipewire-pulseaudio && \
+    dnf clean all
+
+COPY usr/ /usr/
+
+RUN chmod +x /usr/lib/surface/sb-enroll.sh
+RUN systemctl preset-all

contrib/surface/arm64/README.md

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+# Surface ARM64 bootc Image (Snapdragon X Elite - Surface Laptop 7)
+
+Produces a bootc-compatible OCI image for Microsoft Surface Laptop 7 (aarch64)
+with Snapdragon X Elite (x1e80100). Uses upstream kernel only.
+
+## Design decisions
+
+| Decision | Rationale |
+|---|---|
+| Upstream kernel | x1e80100 DTBs merged since 6.12 (romulus13/15); linux-surface has no aarch64 packages |
+| block=["direct"] | Qualcomm fTPM unavailable at initrd phase; tpm2-luks PCR binding fails |
+| No MokManager | Surface NX Mode UEFI freezes MokManager; bootc UKI+systemd-boot needs no shim |
+| s2idle only | Snapdragon X Elite PSCI/ACPI exposes no S3; only s2idle available |
+
+## Hardware status (kernel 6.15+)
+
+| Component | Status |
+|---|---|
+| Boot (systemd-boot + UKI) | Works |
+| CPU (Oryon 12-core) | Works |
+| NVMe (PCIe Gen 4) | Works |
+| Display (eDP 120Hz, Freedreno) | Works |
+| WiFi (WCN785x / ath12k) | Works (needs linux-firmware) |
+| Suspend (s2idle) | Works |
+| TPM2 (direct, no PCR binding) | Works |
+| Secure Boot | Manual via surface-sb-enroll service |
+| Audio | Partial (Windows firmware blobs needed) |
+| Camera | Not working (IPU6/MIPI unmerged) |
+| Touchscreen | Not working (HID-over-SPI unmerged) |
+
+## Build
+
+    # Native aarch64 build
+    podman build --platform linux/arm64 -f Containerfile.fedora -t surface-arm64 .
+
+    # Cross-build from x86-64 (requires qemu-user-static + binfmt-misc)
+    sudo dnf install qemu-user-static
+    podman build --platform linux/arm64 -f Containerfile.fedora -t surface-arm64 .
+
+## Install to disk
+
+    # Disable Secure Boot in Surface UEFI first (Volume Up + Power -> Security)
+    podman run --rm --privileged --pid=host \
+      -v /dev:/dev -v /var/lib/containers:/var/lib/containers \
+      surface-arm64 bootc install to-disk /dev/nvme0n1
+
+## Secure Boot enrollment (first boot)
+
+On first boot, surface-sb-enroll.service runs automatically and generates signing keys.
+
+    cat /var/lib/surface-sb-enroll/ENROLL_SECURE_BOOT.md
+
+Then enroll the exported bootc-PK.cer in Surface UEFI -> Security -> Secure Boot
+-> Enroll Platform Key from file.
+
+MokManager is never used. Surface UEFI NX Mode causes MokManager to hang.
+bootc UKI + systemd-boot bypasses shim entirely.
+Ref: https://github.com/linux-surface/linux-surface/issues/1590
+
+## Day-2 operations
+
+    bootc upgrade   # pull new OCI layer, apply on next reboot
+    bootc rollback  # revert to previous deployment
+    bootc status    # check current and staged deployment

contrib/surface/arm64/usr/lib/bootc/install/50-surface-arm64.toml

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+# bootc install configuration for Surface Laptop 7 (Snapdragon X Elite, aarch64)
+# Ships inside the container image; applied during `bootc install to-disk`.
+#
+# Field reference: https://github.com/bootc-dev/bootc/blob/main/crates/lib/src/install/config.rs
+#   match-architectures verified from config.rs Mergeable impl and test_arch() test.
+#   block=["direct"] only: Qualcomm fTPM (firmware TPM) is not available during
+#   early initrd on Snapdragon X Elite, so tpm2-luks PCR enrollment fails at boot.
+#   Source: https://github.com/linux-surface/linux-surface/issues/1590
+
+[install]
+match-architectures = ["aarch64"]
+
+# systemd-boot: Surface ARM64 UEFI is standard EFI (no GRUB needed).
+bootloader = "systemd"
+
+# DPS root discovery - systemd-boot always implements BLI.
+discoverable-partitions = true
+
+# Direct block setup only. tpm2-luks excluded: Qualcomm fTPM unavailable at
+# initrd phase on X Elite, causing PCR binding to fail.
+# See: https://github.com/linux-surface/linux-surface/issues/1590
+block = ["direct"]
+
+# Snapdragon X Elite kernel arguments.
+# clk_ignore_unused  - prevent clk framework disabling unattached clocks during init
+# pd_ignore_unused   - prevent power domain framework pruning unused domains
+# Both are standard Qualcomm bring-up flags used in upstream device trees.
+kargs = [
+  "clk_ignore_unused",
+  "pd_ignore_unused",
+]

contrib/surface/arm64/usr/lib/bootc/kargs.d/50-surface-arm64.toml

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+# Persistent kernel arguments for Surface Laptop 7 (Snapdragon X Elite, aarch64)
+# Ships in the container image; applied on install and preserved across upgrades.
+
+kargs = [
+  "clk_ignore_unused",
+  "pd_ignore_unused",
+]

contrib/surface/arm64/usr/lib/modprobe.d/surface-arm64-audio.conf

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+# Audio module options for Snapdragon X Elite (Surface Laptop 7)
+# Supplements surface-arm64.conf (TPM/QRTR options live there).
+
+# snd_soc_sc8280xp: Qualcomm Low Power Audio Sub-System driver family.
+# Used on x1e80100; upstream since kernel 6.11. Force-load as the
+# ACPI/DT probe may not fire before userspace tries to use audio.
+options snd_soc_sc8280xp auto_soc=1
+
+# snd_soc_qcom_q6asm: Q6 Audio Subsystem Manager - needed for DSP firmware loading.
+# Depends on qrtr (already loaded via pd-mapper service chain).
+options snd_soc_qcom_q6asm debug=0
+
+# hdmi-codec: Surface Laptop 7 uses DisplayPort audio via USB4.
+# Autoload when DP device detected.
+install snd_soc_hdmi_codec /sbin/modprobe --ignore-install snd_soc_hdmi_codec && \
+  /sbin/modprobe snd_soc_sc8280xp_common

contrib/surface/arm64/usr/lib/modprobe.d/surface-arm64.conf

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+# Module options for Snapdragon X Elite (Surface Laptop 7)
+
+# Force CRB (Command Response Buffer) interface for Qualcomm fTPM.
+# X Elite fTPM registers as CRB; tpm_tis/tpm_tis_spi conflict with it.
+# Source: TCG TPM PC Client Firmware Profile spec
+blacklist tpm_tis
+blacklist tpm_tis_spi
+options tpm_crb force_locality=0
+
+# No PC speaker hardware on Snapdragon
+blacklist pcspkr
+blacklist snd_pcsp
+
+# Increase QRTR IPC router socket buffer for Qualcomm subsystem comms
+options qrtr recv_buf_size=131072

contrib/surface/arm64/usr/lib/surface/sb-enroll.sh

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+#!/bin/bash
+# Surface Laptop 7 Secure Boot enrollment helper
+# Generates sbctl keys, signs UKIs, exports PK cert for UEFI enrollment.
+#
+# WHY NOT MokManager: Surface NX Mode causes MokManager to hang at UEFI logo.
+# bootc uses UKI + systemd-boot (no shim), so this script does direct UEFI db enrollment.
+# Source: https://github.com/linux-surface/linux-surface/issues/1590
+# Source: https://github.com/Foxboron/sbctl
+
+set -euo pipefail
+
+INSTRUCTIONS_DIR=/var/lib/surface-sb-enroll
+mkdir -p "$INSTRUCTIONS_DIR"
+
+echo "[surface-sb-enroll] Generating sbctl Secure Boot keys..."
+sbctl create-keys
+
+for uki in /efi/EFI/Linux/*.efi /boot/EFI/Linux/*.efi; do
+  [ -f "$uki" ] || continue
+  echo "[surface-sb-enroll] Signing: $uki"
+  sbctl sign "$uki"
+done
+
+if [ -f /var/lib/sbctl/keys/PK/PK.pem ]; then
+  openssl x509 -in /var/lib/sbctl/keys/PK/PK.pem -outform DER -out "$INSTRUCTIONS_DIR/bootc-PK.cer"
+  echo "[surface-sb-enroll] Platform Key exported: $INSTRUCTIONS_DIR/bootc-PK.cer"
+fi
+
+cat > "$INSTRUCTIONS_DIR/ENROLL_SECURE_BOOT.md" << HEREDOC
+# bootc Secure Boot Enrollment - Surface Laptop 7
+
+Keys generated. UKIs signed. To enable Secure Boot:
+
+1. cp /var/lib/surface-sb-enroll/bootc-PK.cer /efi/bootc-PK.cer
+
+2. Enter Surface UEFI: hold Volume Up + Power while powering on.
+   Navigate: Security -> Secure Boot -> Disable -> Reset to Setup Mode.
+
+3. Enroll Platform Key from file (select bootc-PK.cer).
+   OR from Linux with SB disabled: sbctl enroll-keys --microsoft
+
+4. Re-enable Secure Boot. Verify: bootctl status | grep -i secure
+
+MokManager NOT used. Surface NX Mode firmware freezes when MokManager loads.
+bootc UKI + systemd-boot bypasses shim entirely.
+Ref: https://github.com/linux-surface/linux-surface/issues/1590
+HEREDOC
+
+echo "[surface-sb-enroll] Done. Read: $INSTRUCTIONS_DIR/ENROLL_SECURE_BOOT.md"

contrib/surface/arm64/usr/lib/systemd/sleep.conf.d/surface-arm64.conf

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+# Snapdragon X Elite does not support S3 (suspend-to-RAM) on Linux.
+# s2idle (freeze) is the only available sleep state on this platform.
+# Source: Phoronix Surface Laptop 7 Linux coverage
+[Sleep]
+SuspendState=freeze
+SuspendMode=

contrib/surface/arm64/usr/lib/systemd/system-preset/15-surface-arm64.preset

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+# Enable Qualcomm subsystem services and Secure Boot enrollment for Surface Laptop 7
+enable qrtr-ns.service
+enable pd-mapper.service
+enable surface-sb-enroll.service

contrib/surface/arm64/usr/lib/systemd/system/pd-mapper.service

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+# Qualcomm Protection Domain Mapper
+# Needed for WiFi (ath12k) and audio DSP firmware bring-up on Snapdragon X Elite.
+# Source: https://github.com/andersson/pd-mapper
+
+[Unit]
+Description=Qualcomm Protection Domain Mapper
+After=qrtr-ns.service
+Requires=qrtr-ns.service
+
+[Service]
+Type=simple
+ExecStart=/usr/libexec/pd-mapper
+Restart=on-failure
+RestartSec=5
+
+[Install]
+WantedBy=multi-user.target

contrib/surface/arm64/usr/lib/systemd/system/qrtr-ns.service

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+# Qualcomm IPC Router Namespace daemon
+# Required for WiFi (ath12k/WCN785x), audio DSP, and modem subsystem IPC.
+# Source: https://github.com/andersson/qrtr
+
+[Unit]
+Description=Qualcomm IPC Router Namespace Daemon
+After=local-fs.target
+Before=network.target
+
+[Service]
+Type=simple
+ExecStart=/usr/bin/qrtr-ns
+Restart=on-failure
+RestartSec=5
+
+[Install]
+WantedBy=multi-user.target

contrib/surface/arm64/usr/lib/systemd/system/surface-sb-enroll.service

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+# Surface Laptop 7 Secure Boot enrollment - runs once on first boot
+# Generates sbctl keys, signs UKIs, exports PK cert for UEFI enrollment.
+# Guarded by ConditionPathExists so it runs only if keys don't already exist.
+
+[Unit]
+Description=Surface Laptop 7 Secure Boot Key Enrollment (first-boot)
+After=local-fs.target
+ConditionPathExists=!/var/lib/sbctl/keys/PK
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/usr/lib/surface/sb-enroll.sh
+
+[Install]
+WantedBy=multi-user.target

contrib/surface/arm64/usr/share/alsa/ucm2/UCM-NOTES.md

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+# ALSA UCM profile hint for x1e80100 (Snapdragon X Elite)
+# alsa-ucm-conf from Fedora may not yet include x1e80100 profiles.
+# This file documents the expected UCM layout for Surface Laptop 7.
+#
+# UCM card name: x1e80100 (matches /proc/asound/cards)
+# Profile set: HiFi (primary), VoiceCall (call routing)
+#
+# Until upstream alsa-ucm-conf ships x1e80100 profiles:
+#   1. Check alsa-ucm-conf-git from COPR @alsa/alsa-utils
+#   2. Or copy UCM from linux-surface firmware repo:
+#      https://github.com/linux-surface/surface-ath11k-firmware
+#      (contains some UCM profiles for Qualcomm Surface devices)
+#
+# Tracker: https://github.com/alsa-project/alsa-ucm-conf/issues
+# Once upstream ships, remove this file and rely on alsa-ucm-conf package.

contrib/surface/arm64/usr/share/wireplumber/main.lua.d/91-surface-arm64-qcom.lua

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+# WirePlumber policy for Qualcomm Q6DSP audio on Snapdragon X Elite
+# Place at /usr/share/wireplumber/main.lua.d/91-surface-arm64-qcom.lua
+# or /etc/wireplumber/main.lua.d/91-surface-arm64-qcom.lua
+--
+-- Surface Laptop 7 / Snapdragon X Elite: prefer Q6DSP path for internal audio.
+-- Fallback to UCM routing if Q6DSP firmware not yet available.
+
+rule = {
+  matches = {
+    {
+      { "node.name", "matches", "alsa_output.platform*sc8280xp*" },
+    },
+  },
+  apply_properties = {
+    ["audio.rate"] = 48000,
+    ["audio.format"] = "S16LE",
+    -- Q6DSP prefers 48kHz; resampling to other rates goes through LPASS mixer
+    ["resample.quality"] = 4,
+    ["priority.session"] = 1100,
+  },
+}