I tried and it didn't work for me. I'm on 2.10 firmware.
I have had some mkv files work ok. I believe it's something to do with the compression ratio and not the container. There were tons of articles on the web about it and even some quick fix guides. Do a search if you are really interested. But i gave up and now just stick to xvid and divx as so far i have had very few files that wont run with this method/container