I recently installed a new system on a A8-3850/Radeon HD 6550. I have a green sort of "jitter" across the green, in particular in games, but also in the browser over areas that are mostly dark/black. I was originally running 7.5 of the driver along with kernel 3.18.12. I tried upgrading to the git driver and 4.0.2 kernel, but it made no difference. Downgrading the driver to 7.3 also didn't help. I couldn't immediately compile the 6.x series, but if it helps narrowing something down, I could try again.
Can you get a picture of it? Does it look like graphical corruption or a problem with the signal to the monitor? Please attach your xorg log and dmesg output.
> or a problem with the signal to the monitor I pulled out the cable, plugged it in again, and tightened the screws. The problem disappeared. Apologies for wasting your time.
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