19 GPU crash xorg

Hello! Trying to load xorg process to 19 GPU on Ubuntu 18.04. I installed source code of xserver-xorg-core via apt-src, then change MAXSCREENS and MAXGPUSCREENS from 16 to 32 in xorg-server-1.19.6/include/misc.h and built. Then installed xserver-xorg-core_1.19.6-1ubuntu4.9_amd64.deb. If I have 16 GPUs in xorg.conf server works, if 19 - server crashes with this log [ 6630.566] - Pastebin.com. Config for 19 GPU Section "ServerFlags" - Pastebin.com