But that doesn't mean you necessarily get to keep the affected feature - the only 'work-around' might be to disable it. Consider TSX on Haswell and Broadwell, where Intel had to disable the whole feature because of a bug. And of course there was the 486 FP bug which couldn't be fixed by any kind of microcode update.

If Intel had to completely disable hyperthreading in Skylake and Kabylake that would make the premium anyone paid for i5 vs i7 worthless.

you mean i3 and i7.

despite what cpuinfo tells you, no HT in i5.

and my previous comment was ironic :)

But if you don't have HT in your i7, you basically have an i5 that you paid more than you needed for.

Or has that changed? At one point, i7 was full-featured, i5 was an i7 with HT disabled, and i3 was i7 with HT intact but smaller caches. Is that different with Skylake/Kabylake?

and my previous comment was ironic :)

Ack - sorry. I must be irony-impaired. That's why I don't post very often. :-)

i3 also has half the cores.

Mobile dual-core lie5's have hyperthreading too.