I don't understand why you'd be using a 290 to mine Myriad-Groestl on linux? Wrong algo.
huh ?
I don't understand why you are posting that ? wrong or random answer...
AFAIK, Myriad-Groestl is only used by DGB and MYR. And if you're gonna mine either of those coins with a 290 (I have half a dozen 290s), Skein is by far the better algo for that particular gpu. See
https://bitcointalk.org/index.php?topic=1186670 for more details.