*** This bug is a duplicate of bug 1829620 ***
https://bugs.launchpad.net/bugs/1829620
Thanks for testing, Jackneill.
To explain, the "dis_ucode_ldr" option disables loading of microcode
updates by Linux. Microcode updates are are binary blobs (no source code
is available) which modify operation of a CPU until the next reboot.
They are supplied by CPU manufacturers / vendors to mainboard
manufacturers / vendors and are now more commonly shared with operating
systems, too. Linux supports loading them into the CPU during early
boot.
Unfortunately, with the latest microcode update (which was released by
the same time as the kernel updates you reported about on 19.04 and
18.04 LTS), your CPU seems to not behave reliably, causing a high
percentage of your boots into Ubuntu to fail. This root cause is
confirmed by using the dis_ucode_ldr kernel boot parameter, which, as
you report, ensures your system boots up fine every time.
I will now mark this bug report as a duplicate of bug #1829620 (I am
convinced both Kai-Heng and TJ meant to point to the same bug report)
and suggest you keep using "dis_ucode_ldr" temporarily until Intel
releases a new microcode update and it becomes available in Ubuntu via
https://packages.ubuntu.com/search?keywords=intel-microcode - the status
of bug #1829620 should change to "fix released" at that time. Feel free
to address me on IRC (#ubuntu) in case of any questions of a support
nature, or add to the bug report if you would like to report more
details on this issue.
** This bug has been marked a duplicate of bug 1829620
intel-microcode on ASUS makes kernel stuck during loading initramfs on
bionic-updates, bionic-security
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https://bugs.launchpad.net/bugs/1829402
Title:
Purple screen hangup during boot
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