Upvote:1
Made my comments into a provisory and partial answer.
In western Tibet it seems the kingdoms of Guge, Purang, Mar-yul, Yar tse and Zanskar were still around by the 11th century. Couldn't find anything from eastern tibet, unfortunately.
When Nima-gon died around 930AD, Mnah-ris (Ngaris), the Western Tibetan Empire, was divided among his three sons: Pelgyi-gon, the eldest and thus the suzerain over the others, got Manyul (Upper Ladakh), Tashi-gon got Gugé and Purang, and Detsu-gon got Zanskar, Lahul, and Spiti.
Later, Lhachen Utpala (1080-1110), grandson of Pelgyi-gon and the king of Ladakh, vassalized Purig, Purang and Kullu (Lahul-Spiti).
You can get most of that info if you follow the timeline in Buddhist Western Himalaya: A politico-religious history