[Bug 1882890] Re: intel-ucode/06-4e-03 from release 20200609 hangs system in early boot

[DanglingPointer]

Ok it worked.

1)
I went here: https://launchpad.net/ubuntu/+source/intel-microcode
to check what version of intel-microcode to downgrade to.  Basically I wanted the previous one that had no issues.

2)
I used an ubuntu-live-usb to chroot into my yoga 710-11ISK laptop (intel m3-6Y30)

3) 
$  sudo apt-get purge --auto-remove intel-microcode

4)
$  sudo apt install -y intel-microcode=3.20191115.1ubuntu3
That's the version from point 1 above

5)
I was unable to update-initramfs for some reason while in chroot
I noticed that ~1/7 reboots into recovery would work; don't know why.  But I found out the hard way  trying to figure out what the heck had gone wrong banging my head reboot after reboot!
Anyway once in recovery mode I...
  $  sudo update-initramfs -u

6) I rebooted and logged-in multiple times to ensure problem is gone.  Including from powered-off state.
Awesome!

7) Ubuntu's package management will want to install the newest cr at p intel-microcode (I swear I'm getting AMD next time)...
$  sudo apt-mark hold intel-microcode
That holds the package from upgrading until the microcode is fixed.  I don't think Ubuntu can fix this, it will have to be Intel.

I hear Lenovo are now selling Ubuntu certified AMD laptops!... hmmm

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https://bugs.launchpad.net/bugs/1882890

Title:
  intel-ucode/06-4e-03 from release 20200609 hangs system in early boot

Status in intel-microcode package in Ubuntu:
  Confirmed

Bug description:
  Hi,

  This morning I applied the latest updates on my Ubuntu 16.04 (kernel
  4.15.0-106-generic + intel-microcode 3.20200609.0ubuntu0.16.04.0) and
  rebooted as usual to boot on the new kernel but the system won't boot:
  black screen.

  I tried booting the previous kernel 4.15.0-101 and it seems to be the
  same : in grub I select the 4.15.0-101 kernel, press enter, a message
  "Loading initrd..." is printed but nothing else happens.

  Tried even older kenrel 4.4.0-184-generic : same problem, "Loading
  initrd...", and nothing happens.

  I managed to boot a 4.4.0-142-generic, but bluetooth and wifi are non-
  functionnal.

  I mounted the /boot partition from a USB rescue drive, and it seems that all the initrd images that got updated this morning are not bootable anymore :
  - initrd.img-4.15.0-106-generic
  - initrd.img-4.15.0.101-generic
  - initrd.img-4.4.0-184-generic

  I tried regenerating the images with update-initramfs but it's the
  same : "Loading initrd" message but nothing happens.

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