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

[Mathieu Trudel-Lapierre]

@tobia; contact Lenovo support. If USB does not show up, it's not an
Ubuntu issue. Your USB system may be failing, or the USB key is not
recognized (which would make it not show up as a boot option). You might
want to try with a different USB key. Was 'ubuntu' listed before under
UEFI? You should also not change the boot settings unless you know what
you are doing, as doing so can obviously keep your system from booting
correctly. If things are being reset at boot (presumably after a few
seconds of delay at a blank screen), then you might be dealing with a
bad firmware; you should contact Lenovo for help to upgrade or revert
the last firmware update.

@Alexis Rico (sferadev); I suspect your hard drive is failing, or you
are dealing with a bad firmware. GRUB would not cause this. What options
are you trying to change in BIOS? What happens exactly when you try it?
Is there an error, does it allow you to save, but then you get a blank
screen for a while, and the system "reboots" again?

@bruno; as above: what happens? What settings do you try to change? What
happens exactly when you do? What precise steps do you take?

In general, if you are unable to save setting changes in BIOS, you
*need* to contact Lenovo support, especially if at "reboot" you see a
blank screen for a while before anything happens. This may mean the
firmware is confused, and its safety mechanisms will attempt to recover
by settings back to their defaults.

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

Title:
  Ubuntu 17.10 corrupting BIOS - many LENOVO laptops models

Status in grub2 package in Ubuntu:
  Incomplete

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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