Public bug reported:

1,2) Please see the apport attachments
3) Fast booting without errors as with xenial non-hwe kernels
4) The booting is too long
The errors are similar to this:

[drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] *ERROR* 
[CRTC:41:pipe B] flip_done timed out
[drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] *ERROR* 
[PLANE:35:plane B] flip_done timed out

The errors appears on Toshiba Satellite L300-11Q.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-20-generic 4.15.0-20.21
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CasperVersion: 1.394
CurrentDesktop: LXDE
Date: Fri Aug  3 20:34:23 2018
LiveMediaBuild: Lubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=ru_RU.UTF-8
 SHELL=/bin/bash
SourcePackage: linux-signed
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux-signed (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug bionic xenial-hwe

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https://bugs.launchpad.net/bugs/1785326

Title:
  The booting is too long with drm_atomic_helper_wait_for_dependencies
  errors (xenial+hwe,bionic).

Status in linux-signed package in Ubuntu:
  New

Bug description:
  1,2) Please see the apport attachments
  3) Fast booting without errors as with xenial non-hwe kernels
  4) The booting is too long
  The errors are similar to this:

  [drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] *ERROR* 
[CRTC:41:pipe B] flip_done timed out
  [drm:drm_atomic_helper_wait_for_dependencies [drm_kms_helper]] *ERROR* 
[PLANE:35:plane B] flip_done timed out

  The errors appears on Toshiba Satellite L300-11Q.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: linux-image-4.15.0-20-generic 4.15.0-20.21
  ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
  Uname: Linux 4.15.0-20-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  CasperVersion: 1.394
  CurrentDesktop: LXDE
  Date: Fri Aug  3 20:34:23 2018
  LiveMediaBuild: Lubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=ru_RU.UTF-8
   SHELL=/bin/bash
  SourcePackage: linux-signed
  UpgradeStatus: No upgrade log present (probably fresh install)

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