On MBP 6,1 2010 Juno beta boots normally at first but then times out on a black screen for over 3min, 5min originally.
I've tried this and it has significantly reduced the boot time, together with editing grub as follows :
changing: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to: GRUB_CMDLINE_LINUX_DEFAULT="video=SVIDEO-1:d"
However, compared to Loki that boots immediately, 3min boot time is too much. Any ideas?