Fixes G7 Chromebook (Jasper Lake) install + audio + reboot issues diagnosed from USB pre-launch.log: - kernel/config-minimal: CONFIG_MMC + SDHCI_PCI/ACPI (eMMC was invisible — no /dev/mmcblk* nodes); CONFIG_MAGIC_SYSRQ=y so echo b > sysrq-trigger can rescue a hung reboot on kernels where busybox reboot(2) is blocked - CONFIG_CMDLINE: drop snd_intel_dspcfg.dsp_driver=0 — forcing legacy HDA breaks SOF on Jasper Lake; let the driver autoprobe (SOF on Chromebook, legacy HDA on ThinkPad X13) - ac-native.c: install loop scans p1..p16 over two passes; pass 0 is non-destructive so Chromebook ESP at p12 is found before the p1 rescue mkfs would clobber the stateful (ext4) partition - initramfs/init: log mmcblk/pci/rfkill/asound state; pipe /dev/kmsg instead of dmesg (busybox applet absent); after reboot -f, fall back to sysrq-b then sysrq-c so the machine never silently freezes Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>