> below a scene I started some days ago 

Nice scene! Although you should have replaced the luxrender
picture by a povray logo in the second version ;)

>   - Areas which have no direct lighting do not show any normal effects 
> (All walls have bumps, but this can be seen behind the plant only).

By default, radiosity ignores normals (see 2.3.7.4). You can add
"normal on" in the radiosity block, but it might be slow. Using fill
lights may be an alternative.

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