hmmm, I think I'm trying to fix the bug in another way, please refer to patches at https://patchwork.kernel.org/patch/6166681/ https://patchwork.kernel.org/patch/6166691/ https://patchwork.kernel.org/patch/6166701/ with these three patches, it should work even with step_wise governor, and I'd like to push these patches to 4.1 and 3.18 - 4.0 stable kernel. about commit 178c2490b99f898efc06d1ad75cadc84f13021a6, are you going to revert it in suse kernel, or upstream stable kernel?