I tried to google the problem in various ways -- without success. But I had had a rough idea already that it was probably due to the detailled timing settings of the VGA output. In my Computer Monitor, there was an auto-adjust and a manual adjust function for such occurrences, but here it was missing. Today I googled again, this time using some additional terms and now I finally have the solution: xvidtune.
Update: Ok, it isn't quite that easy I see. You need/can do this via xrandr, though: You need to press show in xvidtune, then copy that mode and add and activate it via xrandr:
xrandr --newmode "1920x1080-5" 148.50 1920 2056 2100 2200 1080 1084 1089 1125 +hsync +vsyncNow it should work! ;)
xrandr --addmode RGB0-1 "1920x1080-5"
xrandr --output RGB0-1 --mode "1920x1080-5"
As one of my major reasons for creating this blog, I hope this will be found by google to help out other users, as so frequently in the past already. Let me know how this works for you in the comments!
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