[Bug 972375] Re: Kernel Boot messages broken - maybe to wrong tty?

[jhansonxi]

I'm encountering a similar problem with LUKS/dm-crypt passphrase
prompts.  They are either not displayed or displayed on the wrong tty.
Bug #816267 may be related.

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https://bugs.launchpad.net/bugs/972375

Title:
  Kernel Boot messages broken - maybe to wrong tty?

Status in “plymouth” package in Ubuntu:
  Confirmed

Bug description:
  Up to 10.10, the boot console would display kernel messages
  (as shown after boot by dmesg)
  and boot log messages (as in /var/log/boot.log)
  mixed together.

  From 11.04, the boot console only shows boot log messages,
  the kernel messages are missing,
  which leads to a mostly black screen (15-20" !) booting process.

   The kernel messages seem to be going to tty1
  (can see them there when I quickly and briefly switch to tty1 at the gui login prompt).
  So maybe I could fix this problem if I could get these kernel
  messages back to tty7,
  which I think is where boot happens?

  But editing /etc/default/grub to:
  GRUB_CMDLINE_LINUX="vga=795 console=tty7 loglevel=7"
  does not return the kernel messages to the boot console where I can see them.

  One other point that partially contradicts the above:
  after the boot log msgs start appearing on the console
  (after about 15-20")
  some kernel messages 
  do actually appear on the console.

  So another theory of what is happening
  is that after grub exits,
  the boot console is disabled in some way
  until the process that writes the boot log messages starts to write to it.

  Some discussion on
  	http://ubuntuforums.org/showthread.php?p=11761850
  including many 'workarounds' I tried which do not work,
  and links to several other discussions on this bug, mainly by server side types.

  I am using Kubuntu, but others commenting on this are using Ubuntu.
  I am using Desktop, but have seen discussions by those with Ubuntu Server with the same issue.
  I am using 64 bit, but the same thing happens in a 32 bit virtual machine.

  Am using grub 1.99-rc1 in 11.04
  whereas 10.10 (which boots correctly) uses 1.98.
  However both are grub2, so it is not a grub1 / grub2 difference.

  Anybody suggesting that I remove 'noquiet' to fix this,
  or anything similarly banal,
  I will fly over there and poke them in the forehead.  
  This has been dealt with in the forum.

  As this all worked in 10.10 and as of 11.04 no longer works,
  it appears to be a regression.

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