[Bug 1734147] Re: Ubuntu 17.10 corrupting BIOS - many LENOVO laptops models

[Steve Langasek]

Based on the description of how the problem arises - Ubuntu 17.10
installed on a system booted in legacy mode, not in UEFI mode, and the
problem showing up only after upgrade to Ubuntu 17.10 when Ubuntu 17.04
was running fine - it is likely that any problems here are in the Linux
kernel rather than in the bootloader.  When booting in BIOS mode instead
of UEFI mode, the grub package does not do anything that touches
firmware settings; and there have been no relevant changes to the grub
code when booting in BIOS mode, between 17.04 and 17.10.

Therefore reassigning this bug to the kernel.

** Package changed: grub2 (Ubuntu) => linux (Ubuntu)

** Changed in: linux (Ubuntu)
       Status: Incomplete => New

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

Title:
  Ubuntu 17.10 corrupting BIOS - many LENOVO laptops models

Status in linux package in Ubuntu:
  New

Bug description:
  Hi all,

  Basically on Lenovo Y50-70 after installing Ubuntu 17.10, many users
  reported a corrupted BIOS.

  It's not possible to save new settings in BIOS anymore and after
  rebooting, the system starts with the old settings.

  Moreover (and most important) USB booting is not possible anymore
  since USB is not recognized. It's very serious, since our machines do
  not have a CDROM.

  Lenovo forums at the moment are full of topics regading this issue.

  For example:

  https://forums.lenovo.com/t5/Lenovo-P-Y-and-Z-series/Y50-70-BIOS-Can-t
  -Save-Settings-or-boot-with-USB/m-p/3849142

  https://forums.lenovo.com/t5/Lenovo-P-Y-and-Z-series/Y50-70-BIOS-Can-t
  -Save-Settings-Or-Exit/m-p/3601285

  https://forums.lenovo.com/t5/Lenovo-P-Y-and-Z-series/y50-70-BIOS-can-t
  -save-settings-and-I-can-t-boot-system/m-p/3865727

  Thank you!!

  #### UPDATE (27/11/2017) ####

  LENOVO machines affected so far:

  Lenovo Y50-70
  Lenovo G40-30
  Lenovo U31-70
  Lenovo G50-70
  Lenovo Z50-70
  Lenovo Yoga Thinkpad (20C0)

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