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> The X1C6 did initially have a problem: It rewrote its Thunderbolt configuration upon every boot, into a kind of physically memory not designed to have a lesson of that many writes.

Heh, that's such a Lenovo problem. I hard bricked my old ThinkPad W520 four times (and got warranty replacements) just by hitting F12 to bring up the BIOS boot menu. It did some sort of write that wore out the BIOS flash chip. I don't think they ever fixed that problem.

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I actually have a W520 that I'd like to continue to use. (That keyboard, plus a surprisingly decent display panel for Lenovo.)

I hadn't heard of this problem, so thanks for the heads up! I'll be very planful and sparing in my BIOS config access/writes.

I think CoreBoot has made it to some if not all of the -20 series. I wonder whether it would make any difference, although I can't see how if you're still writing to that storage.

Interesting! I didn't know coreboot was available for the *20 series. I hadn't touched my W520 since the last warranty replacement. Maybe coreboot will be my next weekend project.

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