I just completed testing upstream kernel linux-
image-2.6.38-020638rc1-generic_2.6.38-020638rc1.201101192228_i386.deb,
which performs worse than 2.6.35-24-generic with regards to Test Case
SNR-003 (Hibernate). First, when the system rebooted after installing
the new upstream kernel, I got "/proc/device-tree: can't find root",
then the machine booted normally. I've included some additional notes
from dmesg for when this happened in the boot process.

When I went into Hibernate the first time, I got the same "ata1: ACPI
set timing mode failed", but this time it did not go away until I hit
enter. Kernel 2.6.35-24-generic doesn't do this and only displays the
message for a couple seconds, then actually goes into Hibernate. The
upstream kernel required user input, which should not be needed.  Again,
coming out of Hibernate, the "ata1: ACPI set timing mode failed" error
displays. Additionally, coming out of HIbernate, the machine took longer
than expected (more than 1 minute) to come out of HIbernate.

Since this has not been fixed, please advise if the 'needs-upstream-
testing' tag/text still needs to be removed?  I assume not because it
hasn't been fixed and needs additional testing, which I can perform.
I'm going to do a couple more iterations of the Hibernate test to make
sure I get consistent results.


#####Dmesg log regarding "/proc/device-tree: can't find root"#######
  pid_max: default: 32768 minimum: 301
  Security Framework initialized
  AppArmor: AppArmor initialized
  Mount-cache hash table entries: 512
  /proc/device-tree: can't find root
  Initializing cgroup subsys ns
  ns_cgroup deprecated: consider using the 'clone_children' flag without the 
ns_cgroup.
  Initializing cgroup subsys cpuacct
  Initializing cgroup subsys memory
#########################################################

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https://bugs.launchpad.net/bugs/694634

Title:
  ACPI error going in/out of Hibernate - Non-impacting

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