ThinkPad X250 (Broadwell HD 5500) internal panels show horizontal corruption
bands at the kiosk; known i915 eDP power-feature issue. Boot installed and
live systems with i915.enable_ips=0 enable_psr=0 enable_fbc=0 (no-ops off
Intel, nothing lost on a kiosk). Debug boot entries stay stock for A/B.
Also size the Chromium kiosk window from the detected mode instead of a
hardcoded 1920x1080 that clips on 1366x768 panels.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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