Comment 18 for bug 1043149

Okay, I hadn't noticed (or heard about) the bit about 'hybrid sleep'.

I switched it on, used the sleep, and then woke up from the sweep.

Then I hit "Restart" and tried to boot into Wubi, but it didn't work. I can't mount the windows partition except in read-only mode.
bcbc@neptune:~$ head -c 30 '/mnt/$LogFile' | tail -c 4 | od -t x1
0000000 01 00 01 00
0000004

After that I performed a "Shutdown" from Windows, Wubi boots fine, including on subsequent "Restarts" from Windows.
bcbc@neptune:~$ head -c 30 '/host/$LogFile' | tail -c 4 | od -t x1
0000000 01 00 01 00
0000004

After going in to Win8 and doing another "Sleep", followed by another "Restart", then Wubi won't boot again. So it seems easily reproducible.
PS in case it matters, this is what hiberfil.sys looks like:
bcbc@neptune:~$ head -c 8 /mnt/hiberfil.sys | od -t x1
0000000 48 49 42 52 09 00 00 00
0000010

I'll guess I'll be turning off 'hybrid sleep' now.