ergosteurandClaude Opus 5.5 9c3b8e48ee Fix kernel 7.x black screen under Plasma Login via DPMS cycle
An apt upgrade switched the display manager from SDDM to plasmalogin,
whose kwin_wayland greeter never runs the SDDM Xsetup hook. Add a
plasma-login.service user drop-in that cycles DPMS off/on with
kscreen-doctor on 7.x kernels, forcing the full modeset that un-sticks
i915 pipe A (a plain resolution change is absorbed by the eDP panel
fitter and doesn't help). Verified across a cold reboot.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-09-27 11:57:44 -04:00
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hp-chell (HP Chromebook 13 'chell', coreboot/MrChromebox, KDE neon) host notes and fixes
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