Well, just restored my stock rom backup and screen off plus volume key down does not launch music
EDIT: Pretty positive it's not kernel related (running faux) understandably it has to be in ROM I'm using (BSC_VZW_M8_1.55.605.2_v2.zip)
I am not sure if Badseed maintains this one anymore since they released their new RoM earlier this summer. I gotta let it go, just let it go, move on, its hard, I have months invested getting things perfect to my liking. Killn me, seems simple but no solution. I talk to Badseed..
Sorry for venting!
HTC one m8 vzw
hit ThAnKs if I was helpful!!!