We got some haswell platforms here and met same issues.

It keeps showing the warning
plymouthd: intel_bufmgr_gem.c:2783: drm_intel_bufmgr_gem_init: Assertion `0' 
failed.
in the log,
however there's no such code in the libdrm-ltsq2. 

Track it a bit It seems that libdrm-ltsq-intel1 didn't replaced libdrm-intel1
then I repack libdrm from the quantal's branch for precise ,
and it fixed the issue. the logo did appear again.

I'm thinking maybe there should be a plymouth lts version which links to
libdrm-ltsq2 or those libdrm-ltsq2 version should replace all the old
version of libdrm.

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https://bugs.launchpad.net/bugs/1086345

Title:
  Quantal-LTS-stack: Showing low-resolution screen on shutdown/reboot

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