ATI graphics problems

Hi All,

My first post, but I've been using Ubuntu for quite a while. Usually I can solve problems on my own as I don't mind reading a bit and fixing these things is a bit of a hobby!

However, I've gotten a bit keen and installed v16.04 before reading too much about it. I have an ATI HD6970 and whoops. All sorts of problems.

First off is that the monitor is the wrong resolution at 1400 x 1050, not 1680 x 1050 as it should be. I've tried adding modes to xrandr but no go. The output of xrandr is:
xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 1400 x 1050, current 1400 x 1050, maximum 1400 x 1050
default coected primary 1400x1050+0+0 0mm x 0mm
1400x1050 77.00*

So that doesn't look quite right.

The major problem is the graphics driver though. No hardware acceleration I think: Graphics : Gallium 0.4 on llvmpipe (LLVM 3.8, 256 bits)

How on earth do I enable hardware acceleration with the radeon driver now being used?

I upgraded from 15.10, so one suggestion might be to fresh install, but I'd rather understand and fix the problem, if its possible at this stage.

Any help would be much appreciated.

Thanks,

Dan