Soft-15khz problem

[Jackalus]

Hello I upgraded my MAME machine from ATI X1550 PCI-E (worked fine!) to AMD HD 5570.

Problem is that now when I set 15khz and reboot the machine (with 11.4 it shows empty adapter info in the soft-15khz for example for 2nd gfx card spot) the screen is split 2 times in the tube(15khz tube) and Catalyst Control Center complains about not finding the gfx card. (Tried with 10.4 too!) When I went to the monitor settings it showed screen has 100hz ?!

Should I use even older drivers (10.2 i used with X1550 I believe). Anyone got experience with Soft15khz and HD 5xxx/6xxx cards?

Thanks a lot.

Edit:
Tried also the DVI port. Forgot to also mention that gfx card names show fine on 10.4 but soft-15khz still fails with double screen.

[Jackalus]

Tried with as old as 10.2 (oldest one that supports 5570) and no luck, still dual screen It's like the GFX driver breaks from soft-15khz patches