[Bug 532047] Re: Plymouth text-mode splash causes X to crash on first run due to shared tty7

[Juan Carlos]

I had this problem with ubuntu 11.10 when I pressing "2" or "Enter" at
login screen or in my account the first time I enter. A temporary
solution that work for me is:

Edit the file /etc/init/plymount-splash.conf and remove the line "or
stopped udev-fallback-graphics".

So it should be:

start on (started plymouth
           and (graphics-device-added PRIMARY_DEVICE_FOR_DISPLAY = 1
                or drm-device-added PRIMARY_DEVICE_FOR_DISPLAY = 1)

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Title:
  Plymouth text-mode splash causes X to crash on first run due to shared
  tty7

Status in X.Org X server:
  Invalid
Status in “plymouth” package in Ubuntu:
  Fix Released
Status in “xorg-server” package in Ubuntu:
  Invalid

Bug description:
  Binary package hint: plymouth

  Lucid adopted the Plymouth graphical splash service that uses the
  Kernel Mode Setting (KMS) facilities to provide a flicker-free
  graphical splash during start-up. For older video chipsets and drivers
  (e.g. intel i815) that *do not* support KMS plymouth falls back to
  using a text console (using the text plugin). It attaches to tty7 and
  outputs Linux terminfo control codes to draw a colour progress-bar at
  the bottom of the display.

  There is an unfortunate interaction between plymouth and X. X also
  uses tty7. When the X/GDM log-in screen appears for the first time
  plymouth is still running. A script triggers a quit message to the
  plymouth daemon. It seems that plymouth is waiting for either the "2"
  key or "Enter" key to be pressed, whereupon a SIGQUIT (signal 3) is
  sent to tty7. This causes both plymouth *and* X to terminate.

  So, if a password contains "2" or the user logs in by pressing "Enter"
  after typing their password, the user experience is that X 'crashes'
  (however, gdb reveals that X receives SIGQUIT).

  Some stray plymouth control codes can be witnessed on tty7 if X is
  stopped and tty7 console is on-screen.

  Upstart (/sbin/init) then restarts gdm (which launches X) and the
  second session performs correctly.

  *** A temporary workaround is to disable the plymouth-splash upstart
  job ***

  sudo mv /etc/init/plymouth-splash.conf /etc/init/plymouth-
  splash.conf.disabled

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