[arch-general] Gummiboot and EFISTUB booting irregularities

Hi all, I couldn't find a better way of phrasing this as I'm not quite sure what the problem is or how to debug this. I have Arch with the 3.15.1-1 kernel installed on an HP laptop (intel motherboard), booting using gummiboot and the EFISTUB loader. When I start my laptop (or restart it) and select the Arch Linux entry in the gummiboot menu, I sometimes only see a blank screen instead of any error messages or any of the usual boot text. Ctrl+Alt+Del reboots my laptop. Seemingly at random, if I try again at this point, Arch sometimes boots and sometimes doesn't. Journalctl does not list any entries at all for the failed boot attempts. Can anyone suggest any ways of debugging/solving this? Thanks!