Until nVidia fixes this, the only way to avoid the alt-tabbing bug is to avoid DSC altogether by using a display mode that fits within the data rate of the interface. DSC is used when the data rate of the video signal exceeds that of the interface.
If you've noticed that you get a 1 - 10s black screen when alt-tabbing full screen games where you otherwise shouldn't (same desktop resolution/refresh), it is due to using Display Stream Compression (DSC) on nVidia GPUs.
