Got an x250 and initially when put to sleep (with zzz) it would go to sleep but refuse to ever wake up. Neither opening the lid, pressing the power button, nor holding down "Fn" would do anything to wake it up. The only recourse was to hold down the power button until it did a hard-poweroff.
I touched base with phessler@ since I know he has one. He suggested I could just disable the TPM in the BIOS, but to send a note here with what mode the TPM was running in since that was a bug that should have been fixed. Disabling the TPM (well, marking it inactive) fixed sleep. I investigated and it had been set to "Discrete T" which said it ran in TPM 1.2 mode. Just to be thorough I checked to see how it reacted if set to PTT (TPM 2.0) mode. I set it to TPM 2.0 and the chip to active. Sleep and hibernate work fine with the chip in TPM 2.0 mode. So this bug seems to be specific to TPM 1.2 mode. I'm happy to twiddle more BIOS settings if you come up with a patch for TPM 1.2 on the x250. --Kurt Mosiejczuk
