Description of problem:
I don't have swap partitions, only a swap file (2GB in size).
When I attempt to hibernate into a swap file, the laptop seems to suspend and to start writing the image to the hard drive, but then after it is finished, it immediately wakes up.

here is some relevant info from the dmesg output:
PM: writing image.
PM: Free swap pages: 524286
PM: Saving image data pages (106434 pages) ... done
PM: Wrote 425736 kbytes in 7.94 seconds (53.61 MB/s)
PM: S<3>PM: Swap header not found!
|
Restarting tasks ... done.
PM: Basic memory bitmaps freed

Version-Release number of selected component (if applicable):
kernel-2.6.26.5-47.fc9.x86_64

How reproducible:
Always

Steps to Reproduce:
1. create one swap file (no swap partitions)
2. try to hibernate.

Additional Info:
Hibernation into a swap partition works fine.