Lenovo Pro 9 setup accepts the firmware GPU memory layout
A change merged into quattro accepts the Lenovo Pro 9 GPU memory layout, keeps the firmware's marker, and sets the reservation to 4 GiB so system setup can continue.
Installing on a Lenovo Pro 9 got through the disk install, then system setup stopped in the GPU memory script. The variable matched the shape NVIDIA documented, but one marker differed from the XPS 16, and the old check refused to write. The rest of system setup then aborted.
The reservation was 32 GiB on this machine, not the XPS 16's 62.5 GiB. The change accepts both markers, keeps the one the firmware shipped, and sets the reservation to 4 GiB. An unrecognized marker, or a variable of the wrong length, is still left untouched.
What the Lenovo marker means is unknown, so the script keeps it. The pull request says that layout was checked to boot with 4 GiB on the Pro 9.