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[Bug]: DSI2 panel jitter on fbcon/Plymouth boot splash, stable once compositor takes over (rock-5a, rk3588) #516

Description

@MyVizDrake

fbcon/Plymouth (fbdev-emulation path) shakes while GNOME/Mutter (atomic KMS) is stable, and that lane-rate/delay DTS tuning had no effect.

v26.5.1 for Rock 5A running Armbian Linux 6.18.35-current-rockchip64.

Running Gnome, but saw the same issue with KDE.

Can provide my modified rock-5a-radxa-display10fhd.dts to get the panel to work with this kernel

Switched to text-only output during boot and the boot log messages experienced the jitter as well. Once Gnome takes over it is stable.

Can provide whatever additional diagnostic information is needed.

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