[Bug 1871717] Re: spinner theme, sometimes does not render splash without output

[Paride Legovini]

This still happens when booting the latest Focal ISO images (20200417),
see the attached screenshot. The problem appears to be racey, as
sometimes plymouth does start in time, and the graphical background is
shown, sometimes it does not, and the installer boots in text mode. I
can reproduce the problem on both actual hardware and QEMU.

The problem it likely caused by the fact that plymouthd is not ready yet
when `plymouth show-splash` or casper try to connect to it. If this is
the case, booting with plymouth:debug wouldn't really help, as there is
nothing to connect to.

** Attachment added: "plymouth-connection-refused.png"
   https://bugs.launchpad.net/ubuntu/+source/plymouth/+bug/1871717/+attachment/5357134/+files/plymouth-connection-refused.png

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https://bugs.launchpad.net/bugs/1871717

Title:
  spinner theme, sometimes does not render splash without output

Status in plymouth package in Ubuntu:
  Incomplete

Bug description:
  spinner theme, sometimes does not render splash without output

  desktop installer initrd starts plymouthd, executes show-splash, then
  casper md5check starts.

  Sometimes the progress bar and splash are shown with all the messages.

  Sometimes the screen remains black, but upon pressing ESC, one can see
  plymouth-text messages. pressing ESC again, rerenders the splash with
  casper-md5check progress bar with progress message, and file under
  check message, but not the Ctrl+C message.

  So plymouthd is there, and accepting input, but choosing not to paint
  things?

  From the 20200408 image.

  It is as if plymouth theme has a delay built in, and despite show
  splash.... it is not shown.

  When booting with plymouth:debug set, splash is rendered straight
  away.

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