> Define *old* microcode
The microcode from 3.20180108.0+really20170707ubuntu17.10.1:
[parent]: dmesg -t | grep -i microcode
microcode: microcode updated early to revision 0x29, date = 2013-06-12
microcode: sig=0x206a7, pf=0x2, revision=0x29
microcode: Microcode Update Driver: v2.2.
If Intel were fixing this in microcode in 2013 then there's something
about which they haven't been letting on. This is an Intel(R) Core(TM)
i5-2500K(family 6, model 42, stepping 7).
Similarly running this on my laptop (Intel(R) Core(TM) i5-4330M with
microcode from that same deb package (microcode revision 0x22, date =
2017-01-27) reports that it is not vulnerable.
Both of these systems hang using the new ("current") microcode (their
reports only differs in the CPU type).
One difference I can see on the report for my system running 18.04beta
which is OK with the new microcode is that it says NO "Kernel has the
Red Hat/Ubuntu patch", but the two systems above, which both suffer with
the new microcode, have YES.
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1759920
Title:
intel-microcode 3.20180312.0 causes lockup at login screen(w/ linux-
image-4.13.0-37-generic)
Status in intel-microcode package in Ubuntu:
Confirmed
Status in linux package in Ubuntu:
Confirmed
Status in intel-microcode source package in Xenial:
Confirmed
Status in linux source package in Xenial:
Confirmed
Status in intel-microcode source package in Artful:
Confirmed
Status in linux source package in Artful:
Confirmed
Bug description:
I don't know if this is a problem with the kernel or the microcode,
but we have a significant number of computers in our organization (on
both 16.04 and 17.10) that fail if they have both updated. Booting
with either linux-image-4.13.0-36-generic or intel-microcode
3.20180108.0+really20170707ubuntu17.10.1 allows all these computers to
boot.
## Workaround ##
1. Boot the system with the dis_ucode_ldr kernel boot parameter to temporary
avoid the problem:
https://wiki.ubuntu.com/Kernel/KernelBootParameters
2. Install the previous version of package from
https://launchpad.net/~ubuntu-security-proposed/+archive/ubuntu/ppa/+build/14261530/+files/intel-microcode_3.20180108.0+really20170707ubuntu16.04.1_amd64.deb
3. (Optional) Hold the package so that it won't be upgraded accidentally
sudo apt-mark hold intel-microcode
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/intel-microcode/+bug/1759920/+subscriptions
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