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[Colin Watson <cjwatson@xxxxxxxxxxxxx>]

** Package changed: linux (Ubuntu) => grub2 (Ubuntu)

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https://bugs.launchpad.net/bugs/1334793

Title:
  PowerVM: ubuntu-14.04 stuck in ibm,client-architecture-support reboot
  loop

Status in “grub2” package in Ubuntu:
  Confirmed

Bug description:
  ---Problem Description---
  This bug is a follow-up of Bug#110009. The problem here is after successful installation of Ubuntu 14.04, the system fails to boot the OS. When I select installed OS "Ubuntu" from grub menu, it throws below error and falls back to GRUB menu again and again:

  ..........................................................................
  ..........................................................................
  OF stdout device is: /vdevice/vty@30000000
  Preparing to boot Linux version 3.13.0-24-generic (buildd@fisher04) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) ) #46-Ubuntu SMP Thu Apr 10 19:09:21 UTC 2014 (Ubuntu 3.13.0-24.46-generic 3.13.9)
  Detected machine type: 0000000000000101
  Max number of cores passed to firmware: 256 (NR_CPUS = 2048)
  Calling ibm,client-architecture-support...
  ibm,sp              /vdevice/IBM,sp@4000
  \
  ibm,sp              /vdevice/IBM,sp@4000
  \
  Elapsed time since release of system processors: 10675 mins 3 secs
  error: no suitable video mode found.
    
  Machine Type = IBM,8286-42A Mach serial number: 1069B3T 
   
   
  ---Steps to Reproduce---
  1) Try virtual DVD installation
  2) Boot the LPAR via cdrom
      i.e try below commands from openfirmware prompt:

      0> devalias cdrom /vdevice/v-scsi@30000010/disk@8300000000000000
      0> boot cdrom

  3) proceed with default installation, 100% installation completes. Boot the installed OS from hard disk and you hit this "no suitable video mode found" error and system falls back to GRUB.
   
  Install method: virtual DVD
    
  Install ISO Information: ubuntu-14.04-server-ppc64el.iso
   
  *Additional Instructions for backup: khusriva@xxxxxxxxxx: 
  -Post a private note with access information to the machine that the bug is occuring on.

  == Comment: #1 - David Heller <hellerda@xxxxxxxxxx> - 2014-06-11 15:32:48 ==
  This seems to be a pretty common problem, albeit with multiple causes.  I see that you already tried some of the workarounds in similar bug here:

  https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/699802

  Still, it seems likely this is due to the video mode that grub is
  attempting to user for the splash screen.  Either that, or it's a
  video driver issue at the grub level.

  Can you please try the procedure in comment #4 here:

  http://wwww.ubuntuforums.org/showthread.php?t=1471399

  This involves booting to an alternate method, such as a live cd, and
  operating on the grub config files in the newly installed system.  If
  you are unable to, or have no success with updating the files, it
  would at least be good to collect the files and attach the information
  here, before sending this back to launchpad

  If you are successful in booting to live CD on the same system where
  the boot fails, it would be good to compare the files from live CD to
  those in the failing system.

  Also, do you mind installing with Ubuntu 14.10 alpha images?

  http://cdimage.ubuntu.com/ubuntu-server/daily/current/utopic-server-
  ppc64el.iso

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