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postmarketOS ships a kernel for this laptop, which makes testing an old kernel cheap: their apk carries vmlinuz, the C630 dtb and modules, no image writing needed. 6.9.0-sdm845 crashes exactly like 6.12 and 7.1 — 23 QLINK crashes in 70 seconds, wlfw never appears. Three kernels across two years, one of them from a distro that lists this machine as supported, all identical. That, plus aarch64-laptops publishing a device tree with wifi disabled and no modem node at all, leaves the regression premise with nothing supporting it. Record the method, the modem-test harness that captures verdicts without networking, and the /lib symlink trap that makes installing foreign modules dangerous. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_011XgGF5wfxLDAybVnNz6eNQ