System Details
Device: FLEEX
OS: Arch Linux (Kernel 7.0.12-arch1-1)
Firmware Type: RW_LEGACY
Firmware Version: Google_Fleex.11297.432.0
Internal storage type: eMMC
Summary of the Issue
Fresh installation of Arch Linux (KDE Plasma) booted from an external USB drive using RW_LEGACY dual-boot firmware hangs on a black screen with a solid underscore. The base system works correctly via TTY, but sddm and manual startplasma-wayland attempts immediately crash with a Segmentation Fault (core dumped) inside libQt6Core.so.
Steps to Reproduce
1. Kept stock ChromeOS firmware and enabled RW_LEGACY payload using the MrChromebox firmware script.
2. Installed Arch Linux directly onto an external USB drive.
3. Attempted to boot the USB from the developer mode boot screen (Ctrl + L).
4. Encountered a frozen black screen with a solid, non-blinking underscore right after the bootloader handoff.
5. Accessed tty3, updated system packages via pacman -Syu, and verified that startplasma-wayland throws a segmentation fault at _ZN7QObjectC2ER14QObjectPrivatePS_ (libQt6Core.so + 0x1e1a83).
6. Reinstalled qt6-base and plasma-workspace cleanly, but running startplasma-wayland manually still results in an immediate core dump.
### Expected Behavior
The display manager or desktop environment (startplasma-wayland) should initialize and load the graphical interface using the Intel graphics pipeline without triggering a segmentation fault inside the Qt6 core libraries.