Public bug reported:

I observe lots of i915 warnings in dmesg after the upgrade from 14.04 to 16.04.
My current kernel is 4.4.0-59-generic.


Warnings are:
[ 1078.547129] ------------[ cut here ]------------
[ 1078.547372] WARNING: CPU: 0 PID: 273 at 
/build/linux-5Vy7q8/linux-4.4.0/drivers/gpu/drm/i915/intel_display.c:12169 
intel_atomic_check+0x307/0x6d0 [i915]()
[ 1078.547388] WARN_ON(!connector_state->crtc)
...
[ 1078.591137] ------------[ cut here ]------------
[ 1078.591377] WARNING: CPU: 0 PID: 273 at 
/build/linux-5Vy7q8/linux-4.4.0/drivers/gpu/drm/i915/intel_display.c:12746 
intel_modeset_check_state+0x556/0x910 [i915]()
[ 1078.591394] encoder's enabled state mismatch (expected 0, found 1)
...


I have the following video controller:
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GSE Express 
Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML 
Express Integrated Graphics Controller (rev 03)

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-59-generic 4.4.0-59.80
ProcVersionSignature: Ubuntu 4.4.0-59.80-generic 4.4.35
Uname: Linux 4.4.0-59-generic i686
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116,  1 янв 14 08:17 seq
 crw-rw---- 1 root audio 116, 33 янв 14 08:17 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.20.1-0ubuntu2.4
Architecture: i386
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
Date: Sat Jan 14 08:30:26 2017
InstallationDate: Installed on 2012-08-28 (1599 days ago)
InstallationMedia: Ubuntu-Server 12.04.1 LTS "Precise Pangolin" - Release i386 
(20120817.3)
IwConfig:
 lo        no wireless extensions.
 
 eth0      no wireless extensions.
Lsusb:
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
MachineType: Evo Technologies, Inc. ECOPC N.1A/LE
PciMultimedia:
 
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-59-generic 
root=/dev/mapper/hostname-root ro
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-59-generic N/A
 linux-backports-modules-4.4.0-59-generic  N/A
 linux-firmware                            1.157.6
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: Upgraded to xenial on 2016-08-28 (139 days ago)
dmi.bios.date: 05/19/2010
dmi.bios.vendor: Intel Corp.
dmi.bios.version: JT94510H.86A.0045.2010.0519.1750
dmi.board.name: D945GSEJT
dmi.board.vendor: Intel Corporation
dmi.board.version: AAE57850-407
dmi.chassis.type: 3
dmi.modalias: 
dmi:bvnIntelCorp.:bvrJT94510H.86A.0045.2010.0519.1750:bd05/19/2010:svnEvoTechnologies,Inc.:pnECOPCN.1A/LE:pvr:rvnIntelCorporation:rnD945GSEJT:rvrAAE57850-407:cvn:ct3:cvr:
dmi.product.name: ECOPC N.1A/LE
dmi.sys.vendor: Evo Technologies, Inc.

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


** Tags: apport-bug i386 xenial

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https://bugs.launchpad.net/bugs/1656539

Title:
  Lots of i915 warnings in the log

Status in linux package in Ubuntu:
  New

Bug description:
  I observe lots of i915 warnings in dmesg after the upgrade from 14.04 to 
16.04.
  My current kernel is 4.4.0-59-generic.

  
  Warnings are:
  [ 1078.547129] ------------[ cut here ]------------
  [ 1078.547372] WARNING: CPU: 0 PID: 273 at 
/build/linux-5Vy7q8/linux-4.4.0/drivers/gpu/drm/i915/intel_display.c:12169 
intel_atomic_check+0x307/0x6d0 [i915]()
  [ 1078.547388] WARN_ON(!connector_state->crtc)
  ...
  [ 1078.591137] ------------[ cut here ]------------
  [ 1078.591377] WARNING: CPU: 0 PID: 273 at 
/build/linux-5Vy7q8/linux-4.4.0/drivers/gpu/drm/i915/intel_display.c:12746 
intel_modeset_check_state+0x556/0x910 [i915]()
  [ 1078.591394] encoder's enabled state mismatch (expected 0, found 1)
  ...

  
  I have the following video controller:
  00:02.0 VGA compatible controller: Intel Corporation Mobile 945GSE Express 
Integrated Graphics Controller (rev 03)
  00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 
943/940GML Express Integrated Graphics Controller (rev 03)

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-59-generic 4.4.0-59.80
  ProcVersionSignature: Ubuntu 4.4.0-59.80-generic 4.4.35
  Uname: Linux 4.4.0-59-generic i686
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 янв 14 08:17 seq
   crw-rw---- 1 root audio 116, 33 янв 14 08:17 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.20.1-0ubuntu2.4
  Architecture: i386
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  Date: Sat Jan 14 08:30:26 2017
  InstallationDate: Installed on 2012-08-28 (1599 days ago)
  InstallationMedia: Ubuntu-Server 12.04.1 LTS "Precise Pangolin" - Release 
i386 (20120817.3)
  IwConfig:
   lo        no wireless extensions.
   
   eth0      no wireless extensions.
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: Evo Technologies, Inc. ECOPC N.1A/LE
  PciMultimedia:
   
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-59-generic 
root=/dev/mapper/hostname-root ro
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-59-generic N/A
   linux-backports-modules-4.4.0-59-generic  N/A
   linux-firmware                            1.157.6
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-08-28 (139 days ago)
  dmi.bios.date: 05/19/2010
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: JT94510H.86A.0045.2010.0519.1750
  dmi.board.name: D945GSEJT
  dmi.board.vendor: Intel Corporation
  dmi.board.version: AAE57850-407
  dmi.chassis.type: 3
  dmi.modalias: 
dmi:bvnIntelCorp.:bvrJT94510H.86A.0045.2010.0519.1750:bd05/19/2010:svnEvoTechnologies,Inc.:pnECOPCN.1A/LE:pvr:rvnIntelCorporation:rnD945GSEJT:rvrAAE57850-407:cvn:ct3:cvr:
  dmi.product.name: ECOPC N.1A/LE
  dmi.sys.vendor: Evo Technologies, Inc.

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