There's one thing I still don't understand... the root of the problem
was identified in https://bugs.freedesktop.org/show_bug.cgi?id=91393#c25

why hasn't an option to disable the introduced feature been introduced
so far?  Or even more, why not reverting completely?  The introduced
feature does not work for many of us, making the system unusable, which
means that the feature does not work, period.

while on kernel 4.2 that's the only option for me: download the kernel
sources in ubuntu and revert the two commits and recompile.

Would reverting the two commits still work on the new Ubuntu which comes
with kernel 4.4?

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/1522922

Title:
  Screen flickering in Intel i915 driver

Status in Nouveau Xorg driver:
  Incomplete
Status in xserver-xorg-video-intel package in Ubuntu:
  Triaged

Bug description:
  There's an upstream bug reported here
  https://bugs.freedesktop.org/show_bug.cgi?id=91393 that causes screen
  flickering when using the Intel i915 builtin driver (at resolutions
  lower than the maximal one).

  I think that it will be fixed in newer kernel versions, but for the
  time being, as reported here
  https://bugs.freedesktop.org/show_bug.cgi?id=91393#c25 (and as
  personally tested) reverting those two commits fixes the problem.

  Would that be possible to release a fixed version for the 4.2.0
  stream?

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-19-generic 4.2.0-19.23
  ProcVersionSignature: Ubuntu 4.2.0-19.23-generic 4.2.6
  Uname: Linux 4.2.0-19-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  bettini    1378 F.... pulseaudio
   /dev/snd/controlC1:  bettini    1378 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Fri Dec  4 19:01:00 2015
  HibernationDevice: RESUME=UUID=7ddbc972-3ad6-40de-9313-2bb9395145f9
  InstallationDate: Installed on 2015-05-08 (210 days ago)
  InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: Dell Inc. Dell Precision M3800
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-19-generic 
root=UUID=dd2c7064-53b9-4720-96ab-5e8a3f2db3ea ro noprompt quiet splash 
vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-19-generic N/A
   linux-backports-modules-4.2.0-19-generic  N/A
   linux-firmware                            1.149.3
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: Upgraded to wily on 2015-11-07 (26 days ago)
  dmi.bios.date: 08/17/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A10
  dmi.board.name: Dell Precision M3800
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A10
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: 
dmi:bvnDellInc.:bvrA10:bd08/17/2015:svnDellInc.:pnDellPrecisionM3800:pvrA10:rvnDellInc.:rnDellPrecisionM3800:rvrA10:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: Dell Precision M3800
  dmi.product.version: A10
  dmi.sys.vendor: Dell Inc.

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