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[Aapo Rantalainen <1531578@xxxxxxxxxxxxxxxxxx>]

Dmesg when booting Linux 4.3.0-2.11 normally without external monitor
(bug triggers).

WARNING: CPU: 0 PID: 127 at /build/linux-YUgF4D/linux-4.3.0/drivers/gpu/drm/i915/intel_display.c:1389 
assert_planes_disabled+0x100/0x140 [i915]() 
plane B assertion failure, should be off on pipe B but is still active


** Attachment added: "dmesg.4.3.0-2.11.broken"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1531578/+attachment/4545114/+files/dmesg.4.3.0-2.11.broken

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https://bugs.launchpad.net/bugs/1531578

Title:
  i915. graphics messed, only slide of the screen working

Status in linux package in Ubuntu:
  New

Bug description:
  Computer: EEEpc 701
  VGA compatible controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 04)
  Native resolution 800x480
  linux-image-4.3.0-2-generic=4.3.0-2.11

  Upgraded to the Xenial.

  Happens every time when using  Linux 4.3.0-2. As soon as X starts over
  half of the screen is messed (left side of the screen). Switching to
  the virtual terminal doesn't help, same area is messed in text mode.

  Couple of workarounds:
  *Booting Linux 4.2.0-22-generic
  *Connecting external (VGA) monitor. Now both (internal+external) are working. External can be disconnected then.
  *From grub boot to recovery (kernel 4.3.0-2), then resume. Now screen is working, but resolution is 640x480.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.3.0-2-generic 4.3.0-2.11
  ProcVersionSignature: Ubuntu 4.2.0-22.27-generic 4.2.6
  Uname: Linux 4.2.0-22-generic i686
  ApportVersion: 2.19.3-0ubuntu2
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  aapo       1132 F.... pulseaudio
  CurrentDesktop: XFCE
  Date: Wed Jan  6 20:20:18 2016
  HibernationDevice: RESUME=UUID=00d1e709-9f56-4502-b37b-4652fab29398
  InstallationDate: Installed on 2014-12-01 (401 days ago)
  InstallationMedia: Xubuntu 14.10 "Utopic Unicorn" - Release i386 (20141022.1)
  MachineType: ASUSTeK Computer INC. 701SD
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-22-generic root=UUID=07b17b31-54fe-4035-bc77-962229dbe682 ro forcepae quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-22-generic N/A
   linux-backports-modules-4.2.0-22-generic  N/A
   linux-firmware                            1.154
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/02/2009
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0802
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: 701SD
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: x.xx
  dmi.chassis.asset.tag: 0x00000000
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTek Computer INC.
  dmi.chassis.version: x.x
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0802:bd03/02/2009:svnASUSTeKComputerINC.:pn701SD:pvr0501:rvnASUSTeKComputerINC.:rn701SD:rvrx.xx:cvnASUSTekComputerINC.:ct10:cvrx.x:
  dmi.product.name: 701SD
  dmi.product.version: 0501
  dmi.sys.vendor: ASUSTeK Computer INC.

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