Lighting problem: backdrop too shiny

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I must be doing something wrong because my backdrop is too shiny in the 3d view (rendered mode):

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And in the actual render:

I’ve tried many alternatives, but I always end up with a shiny backdrop. For example, here I’ve assigned the default material to the “lamp” and to the backdrop:

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I’ve change every parameter I know of… until it occurred to me that I should try to change the rendering engine from CUDA to CPU.

In CPU mode I get this:

1354×738 489 KB

That’s just what I was looking for!

I’m in Linux, so maybe there is a problem with CUDA but… is that expected?

Thanks,
Raúl Huertas.