Radeon X550 == Radeon X300 ?

["amla at coitt dot es" <amla at coitt dot es>]

Hi all, 

I cannot manage to set up my ATI Radeon X550 on my AMD64, so the first 
question is whether X550 is supported or not by the last driver version. I 
am supposing it is so because it appears listed as X300/X550 in some 
previous ATI release notes, but not in others (last version for instance). 

I tried even to change ChipID on my xorg.conf to that displayed by lspci as 
follows: 

0000:02:00.0 VGA compatible controller: ATI Technologies Inc: Unknown device 
5b63 ----- THIS ONE (as ChipID 0x5b63)
0000:02:00.1 Display controller: ATI Technologies Inc: Unknown device 5b73 

but it still does not work, so I guess I could try the ChipID from an X300. 
Anyone knows this ChipID? 

Thanks a lot and keep on the good work!
Antonio