This bug may be related to bug #363135 here I can see also my vram
doubled in booth machines and also in a dell laptop, inspiron 1521
nvidia 8400gs mobile.

However the freeze have never triggered in the laptop only in the
machines with the zogis cards.

- Intel with Zogis Nvidia 8500gt 256mb -> Xorg log and nvidia settings says 
512mb            Freezes.
- AMD64 with Zogis Nvidia 7300gt 256mb -> Xorg log and nvidia settings says 
512mb        Freezes.
- Dell Inspiron 1521 Nividia 8400gt M 128mb -> Xorg log and nvidia settings 
says 256mb    No Freezes so far.

I am suspecting a video memory leak because if the machine is just left
with the desktop showing, the bug triggers after some days but when used
heavily (lets say normally) Openoffice, firefox flash, etc, the bug
triggers quicker from a couple of hours to some minutes.

And last I am also suspecting the brand of the cards (Some kind of OC on
the vbios or memory tweaks) but this is something that should be
verified with the same and different models of zogis cards.

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random x server freeze (nvidia)
https://bugs.launchpad.net/bugs/365885
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