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Per default the cheatcode "no3d" is off! Nobody forces you to use it. Boot your Knoppix without this cheatcode and be happy.

But it seems one or more parts of your hardware is broken.

These Cheatcodes which you doesn't recommend are the official cheatcodes by K Knopper.

Please tell us in detail which problems you've got using "knoppix no3d".

Only root is allowed to edit this file.
Use Knoppix menu => Run
Type within this new window
gksu leafpadand you'll get an editor with root-privileges.