Yosemite; MBP Retina 13" can't auto-sleep

This is the first time it has happened to me.
Today I was using my MBP and usually when I leave it for a while, the laptop will auto-sleep, but not today.
So I went online and searched for any possible solutions. And one of the ways to find out which process is preventing sleep is using Terminal and pmset -g assertions, which I did. This is the report.
2015-03-09 13:15:07 +0800
Assertion status system-wide:
   BackgroundTask                 0
   ApplePushServiceTask           0
   UserIsActive                   1
   PreventUserIdleDisplaySleep    0
   PreventSystemSleep             0
   ExternalMedia                  0
   PreventUserIdleSystemSleep     1
   NetworkClientActive            0
Listed by owning process:
   pid 208(coreaudiod): [0x000000b500010170] 00:05:06 PreventUserIdleSystemSleep named: "com.apple.audio.context91.preventuseridlesleep"
Created for PID: 205.
   pid 208(coreaudiod): [0x0000007300010169] 00:06:12 PreventUserIdleSystemSleep named: "com.apple.audio.context99.preventuseridlesleep"
Created for PID: 182.
   pid 68(hidd): [0x0000001e00090168] 00:07:37 UserIsActive named: "com.apple.iohideventsystem.queue.tickle"
Timeout will fire in 573 secs Action=TimeoutActionRelease
Kernel Assertions: 0x100=MAGICWAKE
   id=502 level=255 0x100=MAGICWAKE mod=1/1/70, 7:30 AM description=en0 owner=en0
There were a few threads about it, but nothing seemed to work for me. I tried resetting my PRAM and nothing's different.
This was the thread I referred to which has the most similar issue, but no solutions seemed to surface.
Bluetooth drivers prevent system from sleeping in Mavericks - what's going on!?
ANYONE CAN HELP?

I have exactly same issue
but the process prevented sleep is PreventUserIdleSystemSleep named: "com.apple.audio.context91"
I found the number after "context" is not fixed, sometime it changes, however, i think it always relates to audio driver or something.
i had a lengthy chat with apple support, and first level support doesnt really help much all the things they wanted me to try have been done before i called in, so I was transferred to one of their senior support members after almost two hours online with them. Then the only thing senior member did was just set me up a store appointment right after she got my case, she said it's hardware issue......but my macbook pro is brand new.....i didnt go anyway since i dont think it's hardware problem.
what I did eventually is that manually kill whatever prevents sleep. you can use kill -9 pid to kill it
then it works fine. but this is just a workaround. I hope apple could soon release a fix.

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