[coreboot] Thinkpad x230 video glitches during boot

[Trammell Hudson]

I've built CoreBoot from git and flashed it onto an x230 running Qubes.
It works great, once things are up and running (and after I re-assigned
the PCI devices to the sys-net vm).  However, during startup it
produces pretty crazy video glitches that some would call a feature.

https://www.youtube.com/watch?v=3BJ5qLlNTRg

Or in GIF form: https://j.gifs.com/M8qkKB.gif

My .config is attached.  Any ideas on what might be causing it?