It works but, as I've said on SMOS thread, using roc kernel and changing boot parameter makes power consumption goes from 1150W to 1550W (on the wall, at least on my rx580 rig). Have you checked your power consumption after this change?
On Windows I had 1162W. After switch to this kernel on Linux I tried to downvolt my rx470 by changing voltage table offsets in the DPM stages (that is, set offset of stage 4 or 6, or directly 1000-1050mV, to stage 7, so power consumption is lesser). At the same time I overclock memory and downclock GPU (mostly the same as on Windows). Used ohgodatool for that in realtime.
At the moment I was unable to get the same power consumption, it went from 1162 to 1300 now.
I know that it is not the best way to downvolt. I tried to change VDDC offset in the BIOS (since realtime VDDC change tools are not publicly available, and I have too few cards to hack it myself). This way works with my Sapphire cards, but it requires many reflashes when tuning every card for a stable operation. So I hoped to use only software ways to overclock and downvolt without changing BIOS (except timings).
Probably I have to use the BIOS way anyway if I want a comparable consumption to Windows rig.
As for the hashrate: even if displayed rates are bit lower (Claymore's miner) than on Windows, actual pool rates are the same. So the consumption is only my headache yet.