[Bug 849954] Re: FFe: enable flicker-free boot with lightdm

[John Johansen]

On my lenovo x61t (intel grapics), with out cryptsetup adding "lightdm"
to the special case in /etc/init/plymouth-stop.conf fixes the plymouth
to lightdm transition.  Specifically there is a flixer free transition
where the cursor appears over the plymouth background, however there is
a significant flicker immediately afterwards when lightdm redraws the
screen.

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Title:
  FFe: enable flicker-free boot with lightdm

Status in The Ubuntu Flicker-Free Boot Project:
  New
Status in “plymouth” package in Ubuntu:
  Incomplete
Status in “plymouth” source package in Oneiric:
  Incomplete

Bug description:
  I have recently vetted the lightdm plymouth handling code to confirm
  that it is capable of a flicker-free hand-off from plymouth in the
  same way that gdm was.  We should have updated plymouth pre-beta to
  turn on flicker-free handling; since this didn't get done, this is now
  a freeze exception request.

  This is an important part of the Ubuntu desktop boot experience, and
  not having it enabled constitutes a regression from natty, so I think
  a freeze exception is warranted.  However, since lightdm has been the
  default DM for much of the oneiric cycle, we've not been getting any
  testing of the flicker-free code path in plymouth or the DRM drivers
  so there's definitely some risk of regression from turning it on as
  well.  As such, I don't believe we should enable this in the archive
  until the plymouth change has been tested with at least one system
  each of the intel, nouveau, and radeon drivers, both with and without
  cryptsetup installed (due to cryptsetup's effect of pulling plymouth
  into the initramfs, resulting in an earlier start).

  I have personally tested this with the intel+cryptsetup case only.

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