I tried many things to no avail: reduced the resolution, disabled all advanced video options (lowest quality, no AA, no Vsync, etc.), ran it in window mode, forced the hardware to control the 3d options, and a few other things I cannot remember.
I finally stumbled on a good work-around that has worked flawlessly for me for the past two days - probably 8-10 gaming hours.
1) Install the ATI driver of your choice (I am using 9.8 and have also done some limited but successful testing on 9.10)
2) Install the Catalyst Control Center (CCC) - available bundled or separately with the ATI drivers
3) Run DA:O in windowed mode (i.e. I run 1680x1050 fullscreen, so I chose the 1440 x 900)
4) Verify the flickering is still there
5) Start up CCC in advanced mode
6) Click on the ATI Overdrive menu option
7) Click the "Key" icon to unlock the overdrive options
8) Slide the "GPU Clock" to the lowest possible setting (for me, it was 500 MHz)
9) Slide the "Memory Clock" to the lowest possible setting (for me, it was 700 MHz)
10) Click the "Apply" button
The game instantly cleaned up for me - there was no more artifacting at all. You can now easily experiment with higher settings. I was not able to get stable "non-flickering" performance when I increased the GPU clock speed at all. All told, the game runs very smoothly and for hours at a time without problems. The only stuttering (or slow-down) I get is at the very beginning of a level/movie for maybe a second or two before it smooths out.
I now run the game at:
a) 1680 x 1050 Fullscreen
c) 2x Anti-Aliasing
d) High Texture Detail
e) Vertical Sync
f) Frame-Buffer Effects
NOTE: With the 9.8 drivers, I was able to increase the Memory Clock to its default value (for me, 950 MHz). With 9.10, I saw intermittent flickering until I pushed it back down to the minimum value.
NOTE 2: This is the only game I have this issue on; based on tests run on the video card, I am fairly confident this is not a hardware issue. Truthfully, I hope to have a fix from either BioWare or ATI so I can bump AA to max!





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