Sadly, 337.25 supports video ABI 18, but 1.15.99.902 has ABI 17, so it will not work without ignoreABI.
Even then, my system was nearly unusuable, so i’m back to 1.15.1.
towo, you are mistaken - check e.g. /var/log/Xorg.0.log. Probably confused with 331.79, which does not seem to work at all with xorg 1.16 (just a black screen, when tried with ignoreABI).
Not in debian sid with xserver-xorg-core=2:1.15.99.902-1 from experimental.
This version reports video ABI 17 instead of ABI 18 and so 337.25 does not work.
Since i changed back to 1.15.1, i have no x-log anymore, but be sure, i can read logfiles.
And no, i’m not confused with 331.xx, since i don’t use this driver.
That is actually correct: xorg-server-1.15.99.902 implemented a “ABI Version 17.0” that was buggy – no NVIDIA driver supports it. The current git versions of xorg-server (not yet released, will be part of 1.16.0) now support “ABI Version 18.0”, which the latest NVIDIA driver supports.