I strongly suspect that this is some issue with the IDE controller;
though I don't know what. If you still have the July 27 version lying
around, could you copy the kernel and initrd only off and try booting
with that kernel but with upstart; and see if that does the same thing?
Have added a new bug task for the kernel people to look at.
Ben: reboot (which is just code copied from sysvinit) iterates /proc/ide
and performs the HDIO_DRIVE_CMD ioctl with WIN_STANDBYNOW1 then
WIN_STANDBYNOW2 on the /dev node of any disks it finds there.
If it does that, the disk spins down, then when reboot(RB_HALT_SYSTEM)
is called, it spins back up again briefly, before spinning down.
vm/block_dump doesn't reveal any reason for this.
And as the poster says, this is chipset specific
** Also affects: linux-source-2.6.17 (Ubuntu)
Importance: Undecided
Status: Unconfirmed
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Hard disk stops and restarts on shut down
https://launchpad.net/bugs/61763
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