Yeah, LTSE is how you can keep upgrading your kernel while staying on the LTS releases of Ubuntu. Granted you are limited to the kernel versions of the previously released Ubuntu version and there is a slight delay between when a new version is relased and when it becomes available to LTSE, but overall I have found the stability to be good.
From what I found out (if I remember correctly), I have great confidence that Thunderbolt docks should work well with Linux kernel 3.19+. But take this with a grain of salt since I ended up with the 13 DE and therefore only have a mDP and couldn't try a Thunderbolt dock.
From what I found out (if I remember correctly), I have great confidence that Thunderbolt docks should work well with Linux kernel 3.19+. But take this with a grain of salt since I ended up with the 13 DE and therefore only have a mDP and couldn't try a Thunderbolt dock.