** Also affects: grubzfs-testsuite (Ubuntu)
Importance: Undecided
Status: New
** Changed in: grubzfs-testsuite (Ubuntu Groovy)
Status: New => Fix Released
** No longer affects: grubzfs-testsuite (Ubuntu Xenial)
** No longer affects: grubzfs-testsuite (Ubuntu Bionic)
** Description changed:
[Impact]
Due to some recent problems with a microcode update which broke booting of
some laptops I suggest adding "dis_ucode_ldr" to recovery mode boot options to
allow booting after a bad microcode update.
See the following topics that describe the problems:
- https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1829620
-
https://github.com/intel/Intel-Linux-Processor-Microcode-Data-Files/issues/1
When such problems occur it's very hard to see that the microcode
loading is the issue, the booting just hangs at the purple screen, even
removing "quiet splash" or using the recovery option will not show the
error.
We'll need to double check that dis_ucode_ldr works as expected across all
architectures.
According to the kernel docs
(Documentation/admin-guide/kernel-parameters.txt), dis_ucode_ldr is x86 only,
so my guess is that it will be ignored for other architectures. According to
the kernel code (arch/x86/kernel/cpu/microcode/core.c), dis_ucode_ldr works
for both AMD and Intel.
I have some time tomorrow on test this on a ARM device.
This was also discussed Ubuntu Developer mailing list where it was
suggested to post this here, see: https://lists.ubuntu.com/archives
/ubuntu-devel/2019-June/040725.html
[Test case]
- Check that dis_ucode_ldr is present on Linux entries
+ Check that dis_ucode_ldr is present on Linux entries (zsys support in focal+
is verified by grubzfs-testsuite changes)
[Regression potential]
If you actually require microcode updates to get into userspace, your
recovery option won't work anymore. Does this happen? Seems unlikely.
** Changed in: grubzfs-testsuite (Ubuntu Focal)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1831789
Title:
Add "dis_ucode_ldr" to linux boot options for Recovery Mode
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