Not sure whether you are aware but this issue seems to affect different vendors like Lenovo as well who can't find a solution neither. The same issue is being

Not sure whether you are aware but this issue seems to affect different vendors like Lenovo as well who can't find a solution neither. The same issue is being reported all over lenovo linux forums as well and for example on https://github.com/erpalma/throttled/issues/255 https://github.com/erpalma/throttled/issues/255 you see lots of lenovo people reporting the same. I personally suffer the same issue on my X1G9, the best fix so far is the unload/load all related kernel modules one which makes throttling at least only drop to 1.2 Ghz.