François,

> New to darktable, I try to use it.

Welcome! That's a really wonderful software.

>  I read in the manual (version 1.6)
> about the module "history stack" in the light-room: key "discard"
> will suppress the history for the selected image.

There is no Light-room :) Either a Lighttable or the darkroom.

> This absolutely not the case: the history remains the same. What is
> wrong?

Can you elaborate? What's remains on the history stack? If you're
seeing: original, sharpen, base curve (eventually orientation).

That's ok. Every RAW has needs some initial module to be properly
rendered. 

Cheers,

-- 
  Pascal Obry /  Magny Les Hameaux (78)

  The best way to travel is by means of imagination

  http://v2p.fr.eu.org
  http://www.obry.net

  gpg --keyserver keys.gnupg.net --recv-key F949BD3B

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