Sorry for the long wait - I was quite busy.
If it's so, then the HT patch is not to blame...
But we'll see after
I hope I never claimed / implied that! If anything reducing the amount
of threads (either through the patch or the nosmt kernel parameter) did
improve stability when running Debian.
Onto the tests - I'm rather confused on how to interpret the results.
As stated before, I would test multiple setups with blobs (ifd, me, gbe)
based on the Lenovo BIOS v2.81. I have omitted the vgabios test.
1. fully blob'ed with the me intact (CBFS size 0x700000)
2. fully blob'ed with the me shrinked (CBFS size 0xBE5000)
I tested on two different Linux distributions.
(I build and flashed coreboot using a Raspberry Pi at a older master
than the master used for testing)
*Debian Buster 10.2, Kernel 4.19.0, "old master"*
I couldn't build the crossgcc-i386 with multiple
threads or watch YT
videos using Firefox. I eventually was fed up and decided to
Linux Mint 19.3 Cinnamon to make sure I didn't mess up something on my
*Linux Mint 19.3 Cinnamon, Kernel 5.3.0, master @
I could build the crossgcc-i386 with multiple threads
I could also watch Youtube videos using Firefox but at some point
system would become more or less randomly unstable or Cinnamon would
crash / freeze. Namely when I watched videos in full screen mode. CPU
temps seemed fine though. To rule out Cinnamon as an issue, I installed
Linux Mint 19.3 XFCE.
*Linux Mint 19.3 XFCE, Kernel 5.0.0, master @
The first build of the crossgcc-i386 with multiple
produce some issues / the build could not be continued due to an error.
After a crossgcc-clean the build completed just fine. I also got freezes
when watching YT videos on Firefox namely in full screen mode.
I have attached my .config and a script + systemd unit which I use to
reduce power draw of my T430 (all settings were suggested by powertop,
aside from deactivating turbo boost).
I'm wondering if this is really an issue with coreboot / my Linux distro
or rather hardware related ... I'm considering to throw memtest86+ 
at the RAM and see if the RAM is working properly.