Oops, I forgot to say: if happens with ubuntu 15.04, kernels 3.19 (standard package), and 4.0.* and 4.1-rc{2,3} from mainline.
Oops, I forgot to say: if happens with ubuntu 15.04, kernels 3.19 (standard package), and 4.0.* and 4.1-rc{2,3} from mainline.