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|ID||Project||Category||View Status||Date Submitted||Last Update|
|0017543||CentOS-8||microcode_ctl||public||2020-06-27 04:37||2020-06-27 17:11|
|Summary||0017543: microcode_ctl-20191115-4.20200609.1.el8_2.x86_64 hangs i7-8665U|
|Description||A large percentage of boots (roughly 80-90%) results in hangs on a Dell Latitude 7400 with i7-8665U cpu stepping=12.|
BIOS is 1.7.4, most current as of this writing. dmidecode says this was released 5/11/2020.
Upstream's release notes say this should not be a problem with Skylake CPU's, but this is Whisky Lake per https://ark.intel.com/content/www/us/en/ark/products/193563/intel-core-i7-8665u-processor-8m-cache-up-to-4-80-ghz.html
|Steps To Reproduce||update to microcode_ctl-20191115-4.20200609.1.el8_2.x86_64|
|Additional Information||kernel arg to disable loading microcode updates is: dis_ucode_ldr|
boots fine with that option, or by removing microcode_ctl completely and rebuilding the initramfs with dracut -f
no issues with: microcode_ctl-20191115-4.el8.x86_64
This CentOS package is named slightly different from upstream per https://access.redhat.com/errata/RHSA-2020:2677:
|Tags||No tags attached.|
I also had my Dell Precision 7720 with Xeon(R) CPU E3-1505M v6 @ 3.00GHz (stepping=9) hang on boot with microcode_ctl-20191115-4.20200609.1.el8_2.x86_64, then boot normally with kernel arg dis_ucode_ldr.
Intel says this is formerly known as Kaby Lake.
As an aside, I can't downgrade to previous versions:
dnf downgrade microcode_ctl
Last metadata expiration check: 0:00:57 ago on Sat 27 Jun 2020 01:02:04 PM EDT.
Package microcode_ctl of lowest version already installed, cannot downgrade it.
Nothing to do.
yet in the repo there are three versions to pick from:
Thanks for any insight.