Some Dell systems that use some models of Intel CPUs are susceptible to hangs

and system instability during or after microcode update to newer revisions.

In order to address this, microcode update to these newer revision

has been disabled by default on these systems, and the previously published

microcode revisions are used by default for the OS-driven microcode update.

Please refer to /usr/share/doc/microcode_ctl/caveats/06-8e-9e-0x-dell_readme

and /usr/share/doc/microcode_ctl/README.caveats for details.