Public bug reported:

Under bug 684875 I added a cmdline option to the EC2 HVM instances [1]:
   xen_emul_unplug=unnecesarry

This flag is required to get the instance to boot on EC2 HVM instances.  With 
bug 684875 fixed, we expected that this would no longer be necessary.  However, 
I've tested today and it is still necessary with
$ uname -r
2.6.37-12-virtual
$ dpkg -S /boot/vmlinuz-$(uname -r)
linux-image-2.6.37-12-virtual: /boot/vmlinuz-2.6.37-12-virtual

I'll attach console logs.

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[1] 
http://bazaar.launchpad.net/~ubuntu-on-ec2/ubuntu-on-ec2/ec2-publishing-scripts/revision/258#publish-build-ebs

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.37-12-virtual 2.6.37-12.26
Regression: No
Reproducible: Yes
ProcVersionSignature: User Name 2.6.37-12.26-virtual 2.6.37
Uname: Linux 2.6.37-12-virtual x86_64
AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: 
ls: cannot access /dev/snd/: No such file or directory
AplayDevices: Error: [Errno 2] No such file or directory
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory
CRDA: Error: [Errno 2] No such file or directory
CurrentDmesg: [   20.210048] eth0: no IPv6 routers present
Date: Mon Jan 17 15:42:24 2011
Ec2AMI: ami-f442b39d
Ec2AMIManifest: (unknown)
Ec2AvailabilityZone: us-east-1d
Ec2InstanceType: cc1.4xlarge
Ec2Kernel: unavailable
Ec2Ramdisk: unavailable
IwConfig:
 lo        no wireless extensions.
 
 eth0      no wireless extensions.
Lsusb: Error: command ['lsusb'] failed with exit code 1:
MachineType: Xen HVM domU
PciMultimedia:
 
ProcEnviron:
 LANG=en_US.UTF-8
 LC_MESSAGES=en_US.utf8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.37-12-virtual 
root=UUID=f7ac8333-d0de-4c19-b130-794dbd905a44 ro vt.handoff=7 console=ttyS0 
xen_emul_unplug=unnecessary
RelatedPackageVersions:
 linux-restricted-modules-2.6.37-12-virtual N/A
 linux-backports-modules-2.6.37-12-virtual N/A
 linux-firmware 1.45
RfKill:
 
SourcePackage: linux
dmi.bios.date: 04/14/2010
dmi.bios.vendor: Xen
dmi.bios.version: 3.4.2
dmi.chassis.type: 1
dmi.chassis.vendor: Xen
dmi.modalias: 
dmi:bvnXen:bvr3.4.2:bd04/14/2010:svnXen:pnHVMdomU:pvr3.4.2:cvnXen:ct1:cvr:
dmi.product.name: HVM domU
dmi.product.version: 3.4.2
dmi.sys.vendor: Xen

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug ec2-images kernel-uncat natty needs-upstream-testing

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https://bugs.launchpad.net/bugs/704022

Title:
  xen_emul_unplug=unnecessary on kernel cmdline is required in ec2 hvm

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