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35a32c5
(Get the code!)
# shutdown -h -P now
executed as root from serial console
as described on Bug #958838 (which may or may not be same bug - has been merged with this one in any case)
results in system hung / locked up (imperfectly halted?), but not powered down, whereas same/equivalent works fine with 10.04 LTS,
I retested this on both the released production 12.04 LTS and 11.10:
Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
from the CD ISOs, and the results on both of those are nearly identical, about the only noteworthy difference seen,
is in the case of Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423), some additional output/diagnostics
are seen on the console just after the output of:
umount: /run/lock: not mounted
but before the system freezes (kernel panic?) which are seen on 12.04 LTS but not seen with 11.10:
[ 576.022406] ata2.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6
[ 576.022943] ata2.00: cmd a0/00:00:
[ 576.022944] res 01/60:00:
[ 576.024203] ata2.00: status: { ERR }
In either case, both are quite stuck at that point, and system requires physical reset or power off to continue, and that issue does not exist in 10.04 LTS.