up to flash 10.3 there was accellerated rendering working with fglrx (using an override even with oss drivers), now that is only possible with flash 11.2 (+ override) and vdpau. accellerated decode is only possible with vdpau. this works with flash 11.1 too. however using that vdpau accelleration can lead to an instable system. fglrx has got no vdpau accelleration thats clear, so be sure your cpu is fast enough.
i would not count on running current d3d games using wine, no matter what card you have got. its much faster is to use those games natively on win (well when those games need much raw speed, wine is slow by definition). opengl games should work fairly well, but there are only a few available.
well you last point with 2d accelleration depends on view. when you think that 2d acc includes xv then it is broken with xserver 1.11 currently as that will crash the xserver. if it can render you favorite desktop environment correctly depends on personal preference. most of the time current DE work in 3d mode so 2d acc is less important. often oss drivers work better for standard usage just not for games.
as fglrx does not support vdpau the only way to use native video accelleration is currently a xvba-video vaapi wrapper. this works ok with xbmc when you don't want to decode h264 5.1, it only works up to h264 4.1.
if you did not buy an amd card already get something else, if you have it already well then you have to live with some drawbacks.


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