Microcode revisions 0xda and higher for Intel Skylake-U/Y (family 6,

model 78, stepping 3; CPUID 0x406e3) are disabled as they may cause system

instability; the previously published revision 0xd6 is used instead.

Please refer to /usr/share/doc/microcode_ctl/caveats/06-4e-03_readme

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