Uh Oh, Possible Problem with GPU-based Color Management

NOTE: The following could be an unwelcome side effect of installing the ATI 12.11 Beta 4 display driver, which I installed yesterday to try out with my Radeon HD 7850.
Consider this PNG image file - nothing special, sRGB color space, some well-saturated greenish colors...
It looks like this to me when opened into Photoshop CS6 with either Normal or Advanced GPU modes enabled:
Note that the saturated green lamp is completely blacked out.
It looks like this if the GPU Mode is set to Basic:
The data is actually there, and when I sample the colors I find that the Red channel is clipped (zero).
That is a clue. Sure enough, if I raise the black point of the red channel to 1 the problem is averted:
As it's a pretty obvious glitch I hadn't noticed until just now, this likely started occurring when I installed the new ATI driver yesterday morning, but I'm not sure. It may be some kind of overflow or underflow in the GPU color-management processing, which is moved to the CPU in Basic mode.
I'm doing more investigation, including ultimately cleaning up and dropping back to the ATI Catalyst 12.8 release, but given this behavior I think I'd advise staying away from the Catalyst 12.11 Beta 4 driver for now. Assuming this is a driver issue, 12.8 may still be the best in recent Catalyst releases.
I'll follow-up in this thread as I learn more.
-Noel

2m wrote:
Does anyone here monitor ( ) the ATI/AMD fori if this issue is widespread?
The ATI/AMD forums are mostly populated with people wanting to play games. There are few mentions of Photoshop.
Yes, I browse over there from time to time, where I am considered a "peon". I've seen evidence that a few games show corruption of a type that might be similar to what's shown here, but since it's the GPU programming by Adobe that's going wrong, which we must assume is some kind of edge case that's not behaving as expected, it's hard to say how it might manifest in other programming.
Chances are good gamers shut their computers down when done playing, so the monitor power-down failure may not be seen by many, but again I have had confirmation from several folks that the failure is seen by others besides me. By the way, to be very specific, the monitors DO power down at the prescribed time. Then a little later they turn back on.
See also:
http://forums.amd.com/game/messageview.cfm?catid=454&threadid=162122
http://forums.amd.com/game/messageview.cfm?catid=454&threadid=162123
-Noel

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