phablet@ubuntu-phablet:~$ unity-system-compositor --disable-overlays=false --spinner=/usr/bin/unity-system-compositor-spinner --file /run/mir_socket --from-dm-fd 10 --to-dm-fd 13 --vt 1
Warning: ignoring unrecognised arguments: --vt 1
ERROR: Throw location unknown (consider using BOOST_THROW_EXCEPTION)
Dynamic exception type: N5boost16exception_detail10clone_implINS0_19error_info_injectorINS_6system12system_errorEEEEE
std::exception::what: assign: Bad file descriptor