** Changed in: linux (Ubuntu)
       Status: In Progress => Fix Committed

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https://bugs.launchpad.net/bugs/1773520

Title:
  After update to 4.13-43 Intel Graphics are Laggy

Status in linux package in Ubuntu:
  Fix Committed
Status in linux source package in Artful:
  Fix Committed
Status in linux source package in Bionic:
  Fix Committed

Bug description:
  == SRU Justification ==
  The bug reporter states that after update to Kernel 4.13-43 the intel
  graphics seem to really lag - especially noticeable in apps which are
  using vsync, which, at least on his system, locks to 40fps unlike the
  previous kernel.

  See https://askubuntu.com/questions/1039189/today-i-got-an-update-and-
  graphics-are-not-working-right-on-ubuntu-16-04/1040545#1040545 for
  some other users with the same issue

  This regression was introduced by upstream commit dc911f5bd8aa.  A
  revert of this commit fixes this bug.  Upstream has already reverted
  this commit in drm-tip tree and cc'd it to upstream stable.  However,
  the revert has not landed in mainline or stable yet, so it is being sent
  as a SAUCE patch.

  The revert is also needed in Bionic. However, the Bionic revert is
  slightly differant, so it will be SRU'd separately.

  == Fix ==
  UBUNTU: SAUCE: Revert "drm/i915/edp: Allow alternate fixed mode for eDP if 
available."

  == Regression Potential ==
  Low.  This revert is to fix a current regression.

  == Test Case ==
  A test kernel was built with this patch and tested by the original bug 
reporter.
  The bug reporter states the test kernel resolved the bug.


  After update to Kernel 4.13-43 the intel graphics seem to really lag -
  especially noticeable in apps which are using vsync, which, at least
  on my system, locks to 40fps unlike the previous kernel I have
  installed (4.13-41) which locks at a steady 60fps.

  See https://askubuntu.com/questions/1039189/today-i-got-an-update-and-
  graphics-are-not-working-right-on-ubuntu-16-04/1040545#1040545 for
  some other users with the same issue

  In short
  4.13-41 doesn't have the problem
  4.13-43 has the laggy problem
  ---
  ApportVersion: 2.20.1-0ubuntu2.17
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  james      2835 F.... pulseaudio
  CurrentDesktop: GNOME
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=UUID=ac1331a0-15f2-4832-aebc-48e3ad655add
  InstallationDate: Installed on 2016-05-31 (724 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 8087:0a2a Intel Corp.
   Bus 001 Device 002: ID 04f2:b50d Chicony Electronics Co., Ltd
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: HP HP Pavilion Gaming Notebook
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.13.0-43-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.13.0-43.48~16.04.1-generic 4.13.16
  RelatedPackageVersions:
   linux-restricted-modules-4.13.0-43-generic N/A
   linux-backports-modules-4.13.0-43-generic  N/A
   linux-firmware                             1.157.18
  Tags:  xenial
  Uname: Linux 4.13.0-43-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm audio cdrom dip docker libvirtd lpadmin plugdev sambashare 
sudo video
  _MarkForUpload: True
  dmi.bios.date: 09/16/2015
  dmi.bios.vendor: Insyde
  dmi.bios.version: F.53
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: 80A9
  dmi.board.vendor: HP
  dmi.board.version: 91.18
  dmi.chassis.type: 10
  dmi.chassis.vendor: HP
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnInsyde:bvrF.53:bd09/16/2015:svnHP:pnHPPavilionGamingNotebook:pvrType1ProductConfigId:rvnHP:rn80A9:rvr91.18:cvnHP:ct10:cvrChassisVersion:
  dmi.product.family: 103C_5335KV G=N L=CON B=HP S=PAV X=Null
  dmi.product.name: HP Pavilion Gaming Notebook
  dmi.product.version: Type1ProductConfigId
  dmi.sys.vendor: HP

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