My guess. They introduced some kind of bug in jockey, which is now the 
program which cares for detecting if a closed video driver is available 
and needed/installable. This program does more than it looks; it not 
only cares for installing the packages, but actually configures the 
whole system so that they are used. Since this the fact that xorg.conf 
looks much barer and, well, useless, nowadays.
Since jockey is obviously, bugged, however, this not only means that we 
can't enable simply our "beloved" restricted drivers, it also means that 
even if we install them, the system is not configured so to use them!
My solution was simply to open my xorg.conf file, and add the old

Driver  "nvidia"

line inside the video device section. Guess what, it worked, now I am 
back to compiz (note: this is kinda of a hack - which I hope is only 
temporary. Would be...embarassing to launch Hardy in this situation ;-) ).

As for compiz behaving strangely today, that's another story. They are 
obviously upgrading the packages in the repo, but they are doing so at a 
  strange pace...only some compiz packages are currently upgraded...so 
that now I have compiz-core but can't have compiz-gnome. Oh well, at 
least I can have compiz enabled. Guess we'll see it fixed in some hours...

Kudos

Jeldert Pol ha scritto:
> Fresh install of Hardy:
> 
> 1. Try changing Visual Effects from None to Normal
> 2. It waits, and a crash report is detected.
> 3. Get message "Desktop effects could not be enabled".
> 4. Visual Effects is back to None.
> 
> I haven't installed any graphics drivers. Maybe it cannot be enabled
> because of that, but it shouldn't crash.
>

-- 
jockey-gtk crashed with AttributeError in enables_composite()
https://bugs.launchpad.net/bugs/215005
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