Hi Mao,

I have installed a version of the kernel which ignores the capabilities
of the PCI bridge when determining whether a device can be the boot
device. With this patched kernel, X starts without needing a config
file.

This confirms:
 - that the vga card is not marked as boot device because of the the PCI bridge 
that the VGA card sits behind.
 - not being marked as boot vga is what is causing X not to pick it up the card.

This is a debug patch only, and not a patch we will be able to get
upstream, so I think we will need to discuss with the HiSilicon people
why their hardware is behaving this way.

Regards,
Daniel

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https://bugs.launchpad.net/bugs/1691991

Title:
  Xorg Segmentation fault on Hisilicon D05 board (arm64)

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