Unfortunately I could not afford to have my workstation broken too long, and 
decided to reinstall (with ibex again).
The problem is now solved; even the video bios version is recognized:

head -n3 /proc/driver/nvidia/cards/0
Model:           GeForce 7600 GT
IRQ:             16
Video BIOS:      05.73.22.51.50

So I think the problem was indeed caused a faulty OS.

-- 
ubuntu starts in low-graphics mode after upgrade to intrepid
https://bugs.launchpad.net/bugs/293769
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