UPDATE: BAD UPDATE
Just a little history: I was on driver 15.6 until September. It's then I decided to try 15.9.1 and notice the flickering issue on desktop,
but back then I also noticed a bug while playing games...every games but I had so many issues recently and trying to fix the 2d bug that I forgot about the games bug. I tried many drivers to soon realize that any drivers above 15.6 was causing issues (15.7 and up), the issue mentionned in this thread actually.
I also found out a PSU problem I had with my Lepa G 1600
http://forums.anandtech.com/showthread.php?t=2455424 . So I RMAed my PSU and bought an EVGA SuperNova 1600T2 and my shutting PC issue went away. This process took around a month or so and I just received my RMAed PSU this week. So long process: diagnose PC, realize defective PSU, send PSU to RMA, buy another better PSU, wait for the new PSU, receive new PSU, install new PSU, cable management. This whole PSU problem made me forget about the 15.7 and up bug.
It took a while to diagnose the 2d clocks issue/flickering and to try to find out the best workaround so I settled for GPU Tweak 2d clocks (idle) set at 1250mhz so the desktop flickering went away. So with GPU tweak set accordingly, this issue in the video doesn't appear anymore on desktop
So with all those issues I had for the past two months were solved and put aside, I decided to start back gaming, gaming for long period...
it's then I realise the game stuttering bug was still present when playing for a little while. I have been working on that issue for the past two weeks and I now have a conclusion: since 15.7, there is a bug issue with display port cable/monitor with 2d and 3d.
In the video bellow, I can play for like an hour or less without issue and then stuttering and sound cracking appear after a while, I have to unplug display port cable (or restart PC) to remove the bug and then I can play for another hour before the bug gets back... as shown in the video below:
So in other words, the bug I'm experiencing in this thread is appearing on 2d clocks and 3d clocks, the only workaround I have is for 2d clocks. For 3d clocks I have to unplug and plug back the DP cable everytime the bug appears during games
(as shown in the video above)and by the way it appears in
EVERY GAMES and even if I quit a game and go in another game, the bug will be there too, the only solution is to restart PC or unplug DP cable and plug it back.
No issue with 15.6 but missing many crossfire profiles.
PLEASE AMD, fix your damm things