Hi,
> Then the screen slowly turns white. The problem seems to be in the video interface integrated in the Atom E6xx.
yes, that's your problem, it's not actually an intel gpu but powervr IP with an extremely crappy driver situation. Do you need display output your task? otherwise I'd scrap it and rely on ssh.
Search terms that may be more helpful than e600/gma600: gma500 (same IP at halve clock), poulsbo (codename)