@Robert_U: Ok, found the way to attach a DxDiag -report directly in this thread. My earlier post included a link to a previous version of the report, though. The version attached here is from today.
You asked about my BIOS, I checked and updated to the latest firmware version (F7) of my motherboard (Gigabyte GA-H87N-WIFI), so now it's up to date. Checked the settings concerning graphics (IGP, VRAM etc.), found no "problematic" settings that cound interfere, as to my knowledge.
Then I unplugged my LCD-TV from my computer and (using the same HDMI port&cable) switched it to my desktop monitor (Samsung 2493HM), which is a normal 1920x1200 with integrated speakers. No problems with the change, Windows 8.1 recognized the model and changed the resolution respectively.
Then I downloaded a new development version of Dolphin 4.0-2200 (built today), the master build code still includes culprit code and the bit shifts. Then I executed it in a portable mode (without old settings, shader cache ect), and tested a game. The glitches are still there, unchanged. There is yet another screenshot attached (see especially the cannon and the ribbons of the gifts).
Hopefully this information helps!