Switching to VT (ctrl-alt-F2) and then suspend (sudo pm-suspend) works fine, and resumes to the console.
Switching back to X (ctrl-alt-F7) is then a frozen black screen.
Restarting X before switching back (sudo restart lightdm) works fine.
I believe this was the case with or without a vesa fb.
Originally Posted by danix
I realize that this is all very frustrating, but please understand that we have attempted to reproduce this on many systems
No problem, the word beta still has some meaning