I implemented partial azdo technic in our open source game whose next version is likely to be released this month.
It's not enabled by default.
From catalyst 14.3 beta (where it was introduced) arb bindless textures doesn't honor the srgb status of texture. GL_SRGB textures are sampled as GL_RGB texture.
I workarounded this with a pow(., 2.2) call but I would prefer to avoid an extra instruction.
A graphics support engineer may chime in.
Because you suspect a Catalyst issue, here's where to go.
The specific thread for catalyst driver support is located at: AMD Support and Game Forums - Desktop Catalyst Drivers and Software.
If you have a reproducible case, you can file a defect report at www.amd.com/report.