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[Ander Conselvan de Oliveira <1395182@xxxxxxxxxxxxxxxxxx>]

(In reply to Chris Wilson from comment #10)
> (There is certainly a kernel regression due to planes)

Even so, the original report makes no mention of using nightly or a very
recent kernel. Also, the link to github implies the problem started to
happen after an upgrade from Ubuntu 14.04 to 14.10. The latter uses
kernel 3.16 and xf86-video-intel version 2.99.914. I am able to
reproduce the bug with that config, getting the screen divided
horizontally like in the attached screenshot.

Adding

   Option "Present" "false"

to the device section of xorg.conf works around the problem.

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https://bugs.launchpad.net/bugs/1395182

Title:
  Screen tears on xrandr orientation inverted

Status in X.org xf86-video-intel:
  Fix Released
Status in xserver-xorg-video-intel package in Ubuntu:
  Confirmed

Bug description:
  When xrandr -o inverted is run, the  resulting image is split down the
  middle. This happens 95% of the time; it has worked once or twice
  without tearing. Rotation can be activated through unity-control-
  center Display Settings rotation field, and that reliably works fine.
  When xrandr -o normal is run, the display returns to normal (although
  bug #1376760 is observed). xrandr -o right and xrandr -o left also
  reliably work without issue; this only occurs on xrandr -o inverted.
  The same behaviors are observed with the longer form of the command
  xrandr --output eDP1 --rotation inverted, etc.

  This has also been reported at https://github.com/pfps/yoga-
  laptop/issues/28, which uses xrandr commands to invert the display.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: xserver-xorg-video-intel 2:2.99.914-1~exp1ubuntu4.1
  ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
  Uname: Linux 3.16.0-24-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Fri Nov 21 15:09:03 2014
  DistUpgraded: Fresh install
  DistroCodename: utopic
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 0b) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:2217]
  InstallationDate: Installed on 2014-11-21 (0 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: LENOVO 20CDCTO1WW
  ProcEnviron:
   LANGUAGE=en_US
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-24-generic.efi.signed root=UUID=d032fffc-748c-4ea7-9e61-3c53648c9e27 ro quiet splash vt.handoff=7
  SourcePackage: xserver-xorg-video-intel
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/09/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: B0ET22WW (1.09)
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20CDCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50512 Std
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrB0ET22WW(1.09):bd09/09/2014:svnLENOVO:pn20CDCTO1WW:pvrThinkPadS1Yoga:rvnLENOVO:rn20CDCTO1WW:rvrSDK0E50512Std:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20CDCTO1WW
  dmi.product.version: ThinkPad S1 Yoga
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.12+14.10.20140918-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.56-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.3.0-0ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.3.0-0ubuntu3
  version.xserver-xorg-core: xserver-xorg-core 2:1.16.0-1ubuntu1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.4.0-2ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.914-1~exp1ubuntu4.1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2
  xserver.bootTime: Fri Nov 21 14:47:30 2014
  xserver.configfile: default
  xserver.errors:
   Wacom ISDv4 EC Pen stylus: Invalid type 'cursor' for this device.
   Wacom ISDv4 EC Pen stylus: Invalid type 'touch' for this device.
   Wacom ISDv4 EC Pen stylus: Invalid type 'pad' for this device.
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                1079 
   vendor                                     LGD
  xserver.version: 2:1.16.0-1ubuntu1

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