Looks like the EDID size calculation needs some rework.
(II) NVIDIA(0): Virtual screen size determined to be 1600 x 1200
(WW) NVIDIA(0): No size information available in CRT-0's EDID; cannot compute
(WW) NVIDIA(0): DPI from EDID.
Well it could be computed before without problems. EDID information claims to be version 1.03, size is specified as 41x30cm, resulting in about 100 dpi at 1600x1200.
The EDID information is attached. (EDID can be read out with the nvidia-settings tool)