rihad, thank you for reporting this and helping make Ubuntu better. This
bug was reported a while ago and there hasn't been any activity in it
recently. We were wondering if this is still an issue? Can you try with
the latest development release of Ubuntu? ISO CD images are available
from http://cdimage.ubuntu.com/releases/ .

If it remains an issue, could you run the following command in the
development release from a Terminal
(Applications->Accessories->Terminal). It will automatically gather and
attach updated debug information to this report.

apport-collect -p linux <replace-with-bug-number>

Also, if you could test the latest upstream kernel available that would
be great. It will allow additional upstream developers to examine the
issue. Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Once
you've tested the upstream kernel, please remove the 'needs-upstream-
testing' tag. This can be done by clicking on the yellow pencil icon
next to the tag located at the bottom of the bug description and
deleting the 'needs-upstream-testing' text.

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not
boot, please add the tag: 'kernel-unable-to-test-upstream'.

Please let us know your results. Thanks in advance.

** Description changed:

  I have two identical disks set up in a fake RAID configuration through
  the PC BIOS, over which a LVM2 volume where all my partitions live
  except /boot, which is on its dedicated RAID partition.
  
  After the upgrade to 11.04, when doing a cold restart, /dev/dm-* files aren't 
found, so the booting halts with an error. Stock 11.04 kernel is used as per 
uname:
  Linux rihad 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:24 UTC 2011 
x86_64 x86_64 x86_64 GNU/Linux
  
  Apparently the new kernel also messes up the RAID configuration, because
  the array members are then shown as OFFLINE in the BIOS making the disks
  unusable, and nothing short of a cold restart brings them back to life.
  
- Fortunately I was wise enough to have saved the previous distro's kernel 
vmlinuz-2.6.35-28-generic in my GRUB menu, booting into which can correctly 
initialize the LVM2/DM subsystem, and then after doing a warm reboot into the 
newer kernel everything works. So I must do a two-phased boot every morning, 
which sucks.
- --- 
+ Fortunately I was wise enough to have saved the previous distro's kernel
+ vmlinuz-2.6.35-28-generic in my GRUB menu, booting into which can
+ correctly initialize the LVM2/DM subsystem, and then after doing a warm
+ reboot into the newer kernel everything works. So I must do a two-phased
+ boot every morning, which sucks.
+ 
+ Problem persists with:
+ 
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.2-rc1-oneiric/linux-image-3.2.0-030200rc1-generic_3.2.0-030200rc1.201111071935_amd64.deb
+ 
+ ---
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.23-0ubuntu3
  Architecture: amd64
  ArecordDevices:
-  **** List of CAPTURE Hardware Devices ****
-  card 0: Intel [HDA Intel], device 0: HDA Generic [HDA Generic]
-    Subdevices: 1/1
-    Subdevice #0: subdevice #0
+  **** List of CAPTURE Hardware Devices ****
+  card 0: Intel [HDA Intel], device 0: HDA Generic [HDA Generic]
+    Subdevices: 1/1
+    Subdevice #0: subdevice #0
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC1:  rihad      3074 F.... pulseaudio
-  /dev/snd/controlC0:  rihad      3074 F.... pulseaudio
-  /dev/snd/pcmC0D0p:   rihad      3074 F...m pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC1:  rihad      3074 F.... pulseaudio
+  /dev/snd/controlC0:  rihad      3074 F.... pulseaudio
+  /dev/snd/pcmC0D0p:   rihad      3074 F...m pulseaudio
  CRDA: Error: [Errno 2] No such file or directory
  Card0.Amixer.info:
-  Card hw:0 'Intel'/'HDA Intel at 0xfb100000 irq 46'
-    Mixer name : 'Realtek ID 885'
-    Components : 'HDA:10ec0885,1458a002,00100101'
-    Controls      : 15
-    Simple ctrls  : 8
+  Card hw:0 'Intel'/'HDA Intel at 0xfb100000 irq 46'
+    Mixer name : 'Realtek ID 885'
+    Components : 'HDA:10ec0885,1458a002,00100101'
+    Controls      : 15
+    Simple ctrls  : 8
  Card1.Amixer.info:
-  Card hw:1 'NVidia'/'HDA NVidia at 0xf6000000 irq 17'
-    Mixer name : 'Nvidia GPU 0d HDMI/DP'
-    Components : 'HDA:10de000d,10de0101,00100100'
-    Controls      : 16
-    Simple ctrls  : 4
+  Card hw:1 'NVidia'/'HDA NVidia at 0xf6000000 irq 17'
+    Mixer name : 'Nvidia GPU 0d HDMI/DP'
+    Components : 'HDA:10de000d,10de0101,00100100'
+    Controls      : 16
+    Simple ctrls  : 4
  DistroRelease: Ubuntu 11.10
  InstallationMedia: Kubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
  MachineType: Gigabyte Technology Co., Ltd. P35C-DS3R
  NonfreeKernelModules: nvidia
  Package: linux (not installed)
  ProcEnviron:
-  LANGUAGE=
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  LANGUAGE=
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  ProcKernelCmdLine: root=/dev/mapper/vg0-root ro quiet splash
  ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
  RelatedPackageVersions:
-  linux-restricted-modules-3.0.0-12-generic N/A
-  linux-backports-modules-3.0.0-12-generic  N/A
-  linux-firmware                            1.60
+  linux-restricted-modules-3.0.0-12-generic N/A
+  linux-backports-modules-3.0.0-12-generic  N/A
+  linux-firmware                            1.60
  RfKill:
-  
+ 
  Tags:  oneiric
  Uname: Linux 3.0.0-12-generic x86_64
  UpgradeStatus: Upgraded to oneiric on 2011-10-14 (29 days ago)
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare tty
  dmi.bios.date: 11/16/2007
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F8
  dmi.board.name: P35C-DS3R
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: 
dmi:bvnAwardSoftwareInternational,Inc.:bvrF8:bd11/16/2007:svnGigabyteTechnologyCo.,Ltd.:pnP35C-DS3R:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnP35C-DS3R:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: P35C-DS3R
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/880646

Title:
  11.04 and up cannot start from RAID/LVM2

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