Hi @fabiosun and thank's for your patience with an old and stubborn man.
I am 100 % sure that my MSR 0xE2 register is unlocked thank's to you.
My system is 100% stable and I haven't had one kp with this configuration in the last two weeks.
I'm now running without TSCAdjustReseat.kext and I can't se any issues in performance with or without that kext. What I however can se is that the amount of total energy consumed during the test-cycle are 10 times higher without the kext (three times Cinebench CPU and two times Luxmark open CL) as you can see in the output from my AppleIntelInfo.kext attached in my earlier post.
I have tested running Cinebench five times in a row with or without TSC kext and have exactly the same performance (see attached files). Temperature is not a problem at all.
Everything seems to be fine so I guess I have to wait and see if upcoming 10.13.5 maybe recognise Intel Xeon w series processor as native.
El capitan. It has t7700 cpu, so HS is not option for now. Have to find t9500 cpu. I bought this laptop for 30euros 3 weeks ago, with everything working, battery like new, it looks like from store, 4gb ram, 1920x1200 17" screen, replaced wifi and put SSD. Also sleep and hibernation working, native brightness, volume touch buttons work. Windows was not option because of broken touchpad drivers, and linux because of slow graphics. Here everything works like it should.
AD1981 is also on thinkpad T60. I searched everywhere, but no solution. Here is some half working legacy driver, don't know how binary was patched(if it was):