Comment # 14 on bug 1229908 from Norbert Möndjen

With the actual TW installed via Netinstall I have the same problem. 

Just for info these are the settings for video. I must push the memory settings
to these levels so it doesn't crash the gui. The settings should be even good
for two 8K Displays. Still no chance.

<video>
  <model type="qxl" ram="524288" vram="65536" vram64="524288" vgamem="262144"
heads="2" primary="yes"/>
  <address type="pci" domain="0x0000" bus="0x00" slot="0x01" function="0x0"/>
</video>