I want to add this argument : When blacklisting all cards, we lose
knowledge about the real bugs and we don't help fixing them. I have a
ATI mobility radeon x300. Do we know if that card works? No. Why?
Because it is blacklisted. In reality, this card *had* problems with
very initial versions of compiz and ati in ubuntu (feisty?), but since
Gutsy, ati drivers and compiz works very well, and it is far more stable
than fglrx which is currently the worst graphic driver that I know. Now
we're in Hardy and soon intrepid. We're far away from ati and compiz
versions shipped in feisty.

I think that massive blacklisting is a short term workaround, but it
have a long term negative impact and it is not a valuable solution. I
might be wrong about the real quantity of ATI cards which really have
problems, but it looks to me that only some specific cards really have
problems (like Xpress 200, bug #197135).

Having compiz disabled by default for ATI cards except the special ones
which are confirmed to have serious problems would sound correct to me,
but not a black list which prevent compiz to be enabled on all ATI cards
for people who wants to try it.

-- 
[regression] need to whitelist multiple ATI cards, or remove blacklisting
https://bugs.launchpad.net/bugs/201330
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