Clapham, we really are living with the same man 
. Honestly dp is exactly the same, although he doesn't research gadgets to buy, it's all work related or whatever new venture he is into at the time (it's currently digital marketing) alongside setting up a new company with his friend (the lawyer from Clapham) I too sit there feeling quite lonely sometimes.
It is without doubt exasperated in pregnancy. I was only ever in the uk 3 days per week, the rest of it I was away abroad. I cannot believe how addicted to his laptop he is.
Same as you've I've gotten upset, cried, got frustrated. None of it works it just gets his back up even more. So now I've just decided to shut up and deal with the fact this is how he is.
His friends have passed comment about how much time he spends on his computer. As have others, my sister and his own siblings. We've discussed the laptop when the baby comes along, I think he will have a massive shock to be honest, especially when i return to work and he is left looking after the baby by himself.
I can sympathise with you so much, it's really quite annoying to be sat there with someone who is engrossed in the laptop. It's like 'The other woman' so to speak.
I don't know what the solution is to be honest. I'm still trying to come up with the answer as well.
you aren't alone in this situation at all. I do find that talking rationally to him and saying "Listen I'm quite lonely here" works better than getting upset and shouting, he then usually does something about it, like put it down and we go out for dinner or walk the dog, or suggests we go away for the night somewhere.