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

[Steve Beattie]

Rodman: no, that's an older issue affecting a difference processor
family.

This issue is specifically affecting processors with id 0x406e3; if the
output of dmesg | grep microcode does not contain "sig=0x406e3" then you
have a different issue, and should open a new bug report.

I am working on reverting the 0xdc version of the microcode for the
0x406e3 family back to the 0xd6  version included in 20191115 microcode
update. Test packages should show up soon in
https://launchpad.net/~sbeattie/+archive/ubuntu/lp1882890/ ; I would
appreciate confirmation that those packages do allow affected systems to
boot successfully.

Thanks, and sorry for the problems people are having.

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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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