In F10, my standby/resume cycle was working without a glitch.
In F11, resuming from standby hardly ever works, maybe 1 in 15 tries will actually allow me to resume from standby.
When resuming, either a blank/black screen comes back, or the desktop background shows without the window to unlock the screen. Sometimes the unlock-screen window appears briefly (2s), then disappears and that's it. Dropping to text/login prompt allows me to enter characters for the login but doesn't prompt me for a password after hitting enter, it just repeats the login prompt. It is a very/overly secure system this way.
For some reason I'm suspecting this has to do with the display driver. I was using fglrx in F10, now I'm using up *#*@ creek without a paddle in F11. Apparently, even if fglrx is released for F11, it won't support my display driver. My machine isn't that old.
Oh, and my display is constantly flickering as if I'm working on a dying CRT. The hardware is an HP 6715B laptop with a radeon RS690M (x1200 equivalent). I'll probably go back to F10. Most releases should have matured by now, but F11, although it's ok for a server, is really not for ATI users.
Progress is the Concorde flying in the 70's and now the airbuses are falling out of the sky.