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[Aapo Rantalainen <1547204@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

Ubuntu 16.04
Kernel: Ubuntu 4.4.0-4.19-generic 4.4.1

There are seven WARNINGS in dmesg during boot.
dmesg | grep "cut here" -A 1
[    5.916356] ------------[ cut here ]------------
[    5.916450] WARNING: CPU: 0 PID: 47 at /build/linux-IIZPYL/linux-4.4.0/drivers/gpu/drm/i915/intel_display.c:12147 intel_atomic_check+0x307/0x6d0 [i915]()
--
[    5.917586] ------------[ cut here ]------------
[    5.917661] WARNING: CPU: 0 PID: 47 at /build/linux-IIZPYL/linux-4.4.0/drivers/gpu/drm/i915/intel_display.c:11695 intel_plane_atomic_calc_changes+0x549/0x6b0 [i915]()
--
[    5.996083] ------------[ cut here ]------------
[    5.996176] WARNING: CPU: 0 PID: 47 at /build/linux-IIZPYL/linux-4.4.0/drivers/gpu/drm/i915/intel_display.c:12724 intel_modeset_check_state+0x556/0x910 [i915]()
--
[    6.100769] ------------[ cut here ]------------
[    6.100853] WARNING: CPU: 0 PID: 47 at /build/linux-IIZPYL/linux-4.4.0/drivers/gpu/drm/i915/intel_display.c:12147 intel_atomic_check+0x307/0x6d0 [i915]()
--
[    6.336057] ------------[ cut here ]------------
[    6.336151] WARNING: CPU: 0 PID: 47 at /build/linux-IIZPYL/linux-4.4.0/drivers/gpu/drm/i915/intel_display.c:12724 intel_modeset_check_state+0x556/0x910 [i915]()
--
[    6.338439] ------------[ cut here ]------------
[    6.338516] WARNING: CPU: 0 PID: 47 at /build/linux-IIZPYL/linux-4.4.0/drivers/gpu/drm/i915/intel_fbdev.c:406 intel_fb_initial_config+0x2e4/0x5f0 [i915]()
--
[    6.342397] ------------[ cut here ]------------
[    6.342413] WARNING: CPU: 0 PID: 47 at /build/linux-IIZPYL/linux-4.4.0/drivers/gpu/drm/drm_atomic_helper.c:682 drm_atomic_helper_update_legacy_modeset_state+0x26a/0x280 [drm_kms_helper]()

Happens also with mainline kernel 4.4.1-040401-generic.

Doesn't happen with mainline kernel  4.2.0-040200-generic.

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

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https://bugs.launchpad.net/bugs/1547204

Title:
  i915 several 'call traces' in dmesg

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Ubuntu 16.04
  Kernel: Ubuntu 4.4.0-4.19-generic 4.4.1

  There are seven WARNINGS in dmesg during boot.
  dmesg | grep "cut here" -A 1
  [    5.916356] ------------[ cut here ]------------
  [    5.916450] WARNING: CPU: 0 PID: 47 at /build/linux-IIZPYL/linux-4.4.0/drivers/gpu/drm/i915/intel_display.c:12147 intel_atomic_check+0x307/0x6d0 [i915]()
  --
  [    5.917586] ------------[ cut here ]------------
  [    5.917661] WARNING: CPU: 0 PID: 47 at /build/linux-IIZPYL/linux-4.4.0/drivers/gpu/drm/i915/intel_display.c:11695 intel_plane_atomic_calc_changes+0x549/0x6b0 [i915]()
  --
  [    5.996083] ------------[ cut here ]------------
  [    5.996176] WARNING: CPU: 0 PID: 47 at /build/linux-IIZPYL/linux-4.4.0/drivers/gpu/drm/i915/intel_display.c:12724 intel_modeset_check_state+0x556/0x910 [i915]()
  --
  [    6.100769] ------------[ cut here ]------------
  [    6.100853] WARNING: CPU: 0 PID: 47 at /build/linux-IIZPYL/linux-4.4.0/drivers/gpu/drm/i915/intel_display.c:12147 intel_atomic_check+0x307/0x6d0 [i915]()
  --
  [    6.336057] ------------[ cut here ]------------
  [    6.336151] WARNING: CPU: 0 PID: 47 at /build/linux-IIZPYL/linux-4.4.0/drivers/gpu/drm/i915/intel_display.c:12724 intel_modeset_check_state+0x556/0x910 [i915]()
  --
  [    6.338439] ------------[ cut here ]------------
  [    6.338516] WARNING: CPU: 0 PID: 47 at /build/linux-IIZPYL/linux-4.4.0/drivers/gpu/drm/i915/intel_fbdev.c:406 intel_fb_initial_config+0x2e4/0x5f0 [i915]()
  --
  [    6.342397] ------------[ cut here ]------------
  [    6.342413] WARNING: CPU: 0 PID: 47 at /build/linux-IIZPYL/linux-4.4.0/drivers/gpu/drm/drm_atomic_helper.c:682 drm_atomic_helper_update_legacy_modeset_state+0x26a/0x280 [drm_kms_helper]()

  Happens also with mainline kernel 4.4.1-040401-generic.

  Doesn't happen with mainline kernel  4.2.0-040200-generic.

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