Gray Background of Login Screen After Returning from Screen Saver

I'm setting require password after sleep or screen saver begins
When awaking from sleep
login screen background is blur wallpaper ( correct ),
but when return from screen saver
login screen background is gray ( incorrect )
how to fix it?
Answer Similar Question
http://www.cnet.com/news/os-x-desktop-backgrounds-gray-after-waking-from-sleep/
I try to solve it,
but it dose not any effect.
Now I will updating OS X to v10.10.3
but I think the problem is still there.
MacBook Pro , OS X Yosemite v10.10.2

right, i'd just like to add that this issue was solved by installing "proper" ati drivers, or lowering sync and refresh rates in /etc/X11/xorg.conf, one of those

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