Actually I think I know what is going on. I think the "unpatched" kernel
might miss commit d9018976cdb6 ("mfd: lpc_ich: Do not touch SPI-NOR
write protection bit on Haswell/Broadwell") and in that case the BIOS
resets to defaults each boot.

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https://bugs.launchpad.net/bugs/1734147

Title:
  corrupted BIOS due to Intel SPI bug in kernel

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