HP X2 210 tablet (UEFI) hang

[mcb30]

(2016-02-06 01:16)SebastianRoth Wrote:  Reading about ROM BAR here and there I somehow stumbled upon a check on EFI_PCI_IO_ATTRIBUTE_EMBEDDED_ROM that was removed from the kernel only two month after the whole PCI setup code was added in the first place. From the commit message it sounds like there was a good reason to remove this check but I wonder if this would prevent the issue we see. What do you think?

It's possible that the check may have masked the firmware bug, by causing the kernel to choose not to bother taking a copy of that particular ROM.

I've e-mailed a contact at HP to see if I can get in touch with the people responsible for that particular UEFI firmware build. In the meantime, it would be really helpful if you could get a dump of the contents of the EFI_PCI_IO_PROTOCOL structure.

Michael