I experience a similar effect:
When a long message is displayed with log_success_msg it will extend to the 
right out of the text box. When the text scrolls up, the part of the text that 
is outside the text box, will not be updated.

This happens with /etc/init.d/checkfs.sh when it displays the message
that you are running on battery power.

On the other hand, messages produced with log_daemon_msg will be
wrapped.

** Attachment added: "a simple init script to test usplash line wrapping"
   http://launchpadlibrarian.net/23143164/testusplash

** Description changed:

  Binary package hint: usplash-theme-ubuntu
  
  Visually the text gets corrupted if you enter a long input text when a
  script wants it. I noticed this when using cryptroot that asks me (via
  askpass) for a password that in my case is quite long and doesn't fit in
  the line (gets wrapped).
  
  Usually a few pixels on the bottom of the last line don't move with the
  rest of the text (stay there).
  
  Reproduce:
+ - download the attached init script and install it as /etc/init.d/testusplash
+ - sudo chmod +x /etc/init.d/testusplash
+ - sudo update-rc.d testusplash defaults
+ - reboot
+ 
+ Original reproduce instructions:
  - create an encrypted root partition (with cryptsetup and LUKS) (the Ubuntu 
8.10 installer can handle this without any problems)
  - boot the system and when asked for an password enter a lot of text (so that 
you get into a new line)

-- 
Visual text corruption on long input
https://bugs.launchpad.net/bugs/308351
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