Mario's patches introduce some regressions. Bridged AGP cards are
affected because of the missing PCI-IDs in "nv_list.csv". I suppose
"nv_list.csv" was based on NVKnownChipsets[] table from "nv_driver.c",
but, as I already confirmed, NVKnownChipsets[] is not a complete table
of all *supported* chips. Bridged AGP cards are handled differently by
the code so their PCI-IDs are not listed in NVKnownChipsets[].
NVKnownChipsets[] is mare string reference. Affected PCI-IDs are
02E0-02E4 and 00F0-00FF. The result of all of this is that -nv is
refusing to work with affected cards even when they are supported. In
Jaunty, -nv worked just fine with my card - GeForce 7600 GS AGP, thou
autodetection failed because of the same reason. Now in Karmic,
autodetection works but driver fails to work.

More in the bug #385703 (read the last few comments).

-- 
'nv' is selected when no xorg.conf is present even if it doesn't support the 
nvidia hardware
https://bugs.launchpad.net/bugs/385658
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