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

[bandini]

Hi, looks like this bug is back with the latest microcode update.
My ASUS PC only boot with dis_ucode_ldr kernel parameter.

4.4.0-194-generic #226-Ubuntu

processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 78
model name	: Intel(R) Core(TM) i7-6500U CPU @ 2.50GHz
stepping	: 3
microcode	: 0x74

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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:
  Fix Released
Status in intel-microcode source package in Xenial:
  Fix Released
Status in intel-microcode source package in Bionic:
  Fix Released
Status in intel-microcode source package in Eoan:
  Fix Released
Status in intel-microcode source package in Focal:
  Fix Released

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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