It begs me quite some time. Is the water shader broken on open gl or on linux or not at all? Google image search and youtube were not helpful in finding "how it should look", but the black i can see on water looks definitely wrong.

 

I have the Gog Linux version.

 

Can others please post images of the same scenes to compare?

 

 

Only useful compare i found.

https://i.imgur.com/5MKzz0y.jpg

No black spots with a HD4600 (intel integrated graphic):

 

Fountain in Brighthollow

 

 

 

Ondra's Gift

 

 

 

Bonus: Anslög's Compass

 

 

Ondra's Gift map looks like yours, so there is no need for a screenshot.

This hack fixes it for the open-source drivers on Linux.