Anyone else experience this? I can get quests from Vilkas and Aela, but none from Farkas, even though there is a quest marker above his head?

Also is the companions guild only about radiant quests? Because so far i've done all quests to do with kodlak, got all of the totems in the underforge, and there doesn't seem to be anymore than the go here kill that.

Not sure you took another quest from someone else within the companions.
You can only take one quest at a time, regardless of who you speak to.
So if you have a quest from Ayela you cant get one from Farkas.
So finish up what you have first then you can take Farkas quest.

ive asked when i dont have any quests from them, it doesnt even give me the option of getting work from him.