[coreboot] Suspend-to-RAM on Thinkpad X230

[Gert Menke]

Hi everyone,

I recently installed coreboot on my Thinkpad X230 and overall I am 
pretty happy with it.
Everything seems to work well, except one annoying problem: 
Suspend-to-RAM does not work correctly. Well, maybe suspend works 
correctly, but resume doesn't. Instead of resuming, the system simply 
boots like on power-on.

Since I'm pretty new to coreboot, I'm at a loss here. Is there something 
obvious that I might have missed?
I'm using the current master revision from git 
(4eb155cee47557cd652d1a85fed5021b23f18a2a), and I'll attach my coreboot 
.config.

Thanks in advance for any help!
Gert