Intrepid on 901 with array.org kernel doesn't sleep at first attempt

The sleep functionality works but usually not the first time you select suspend (to RAM) but the second.

That is:
1) You select suspend.
2) The 901 with lean kernel tries to suspend but leaves you back in the lock screen.
3) You enter the password to unlock the screen and select suspend again.
4) This time the 901 does go to sleep as expected (and later it wakes up from the button with no problems)

It happens on Ubuntu 8.10 with the lean kernel (but I think the normal too).

If you need more info about my config just let me know.