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Are smart key make a error in lockscreen, smart key app must be solve
oh yes, smartkey is the reason.
no need to uninstall, just disabled all actions of smartkey also can fix the problem.
Deeply thx. ~~
Thanks a lot.After uninstaling smart key app,walkman works great in lockscreen!
Don't have to uninstall smart key, just disable music controls in.smart key and problem solved
i was trying to solve this issue too!