/usr/share/man/man7/drm-ttm.7.gz is in libdrm-dev 2.4.52-1~precise2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man7/drm-memory.7.gz
/usr/share/man/man7/drm-memory.7.gz