Ah, now I see how it works. The dts has an entry for boot_disp, which has the value 0x040a. I tried changing this to what I thought it would be but it turns out to have been wrong - it picked a 3D mode - so that's entertaining! I tried using dtc from the Ubuntu 16.04 device-tree-compiler package but it couldn't read the format so I don't trust the dtb it generates. longsleep how are you generating the dtb?
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