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[amias <launchpad.net@xxxxxxxxxxxx>]

upgrading to the 4.3 kernel above fixed it for me on my dell 7737 , have been experiencing a lot of fan noise since this started and it doesn't seem to be going away. Using top shows all of my browser processes constantly in more that 4% system calls all the time.
i also have a laggy response to typing.

This is a massive regression from 15.04 where this laptop worked
immaculately , this extra load feels like its  damaging my laptop, it
causes it not to start properly several times before i get a working
desktop which cannot be right. I know there are big changes  a foot but
this is becoming unsuable , especially now you have hidden the boot
process so i've no idea whats going on.

not happy with this regression and how little effort seems to be going
into fixing it

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https://bugs.launchpad.net/bugs/1492764

Title:
  [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in ips_enabled
  (expected 1, found 0)

Status in Linux:
  Fix Released
Status in linux package in Ubuntu:
  Incomplete

Bug description:
  System: Kubuntu 15.10

  Since kernel version 4.2 I have a few of this errors:

  Sep 06 16:16:35 benediktZ50-70 kernel: [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in ips_enabled (expected 1, found 0)
  Sep 06 16:16:35 benediktZ50-70 kernel: ------------[ cut here ]------------
  Sep 06 16:16:35 benediktZ50-70 kernel: WARNING: CPU: 0 PID: 187 at /build/linux-4dBub_/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:12324 check_crtc_state+0x2c5/0x440 [i915]()
  Sep 06 16:16:35 benediktZ50-70 kernel: pipe state doesn't match!
  Sep 06 16:16:35 benediktZ50-70 kernel: Modules linked in: rtsx_usb_sdmmc rtsx_usb i915 i2c_algo_bit drm_kms_helper psmouse ahci drm libahci r8169 mii sdhci_acpi video sdhci i2c_hid hid
  Sep 06 16:16:35 benediktZ50-70 kernel: CPU: 0 PID: 187 Comm: plymouthd Tainted: G        W       4.2.0-7-generic #7-Ubuntu
  Sep 06 16:16:35 benediktZ50-70 kernel: Hardware name: LENOVO 20354/Lancer 5A5, BIOS 9BCN91WW 07/21/2015
  Sep 06 16:16:35 benediktZ50-70 kernel:  ffffffffc023f1e8 ffff8802413277e8 ffffffff817b0465 0000000000000000
  Sep 06 16:16:35 benediktZ50-70 kernel:  ffff880241327838 ffff880241327828 ffffffff81076536 ffff880241327858
  Sep 06 16:16:35 benediktZ50-70 kernel:  ffff8802413278c0 ffff880241152000 0000000000000001 ffff880241152350
  Sep 06 16:16:35 benediktZ50-70 kernel: Call Trace:
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffff817b0465>] dump_stack+0x45/0x57
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffff81076536>] warn_slowpath_common+0x86/0xc0
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffff810765b6>] warn_slowpath_fmt+0x46/0x50
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffffc01d3091>] ? intel_pipe_config_compare+0xb31/0xc60 [i915]
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffffc01d3485>] check_crtc_state+0x2c5/0x440 [i915]
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffffc01e6f3e>] intel_modeset_check_state+0x20e/0x6b0 [i915]
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffffc01e80e7>] intel_crtc_set_config+0x4c7/0x580 [i915]
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffffc009f915>] ? drm_mode_create+0x25/0x60 [drm]
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffffc0099036>] drm_mode_set_config_internal+0x66/0x100 [drm]
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffffc009d5f8>] drm_mode_setcrtc+0x3a8/0x4c0 [drm]
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffffc008e365>] drm_ioctl+0x125/0x610 [drm]
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffffc009d250>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffff811fffd5>] do_vfs_ioctl+0x285/0x470
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffff811ac159>] ? do_munmap+0x349/0x480
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffff81200239>] SyS_ioctl+0x79/0x90
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffff817b6cf2>] entry_SYSCALL_64_fastpath+0x16/0x75
  Sep 06 16:16:35 benediktZ50-70 kernel: ---[ end trace 724377a3c01e4270 ]---

  
  I will check next week if these errors have any impact on my system.

  This is a Nvidia Optimus System with the Intel graphic card activated
  by default.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-7-generic 4.2.0-7.7
  ProcVersionSignature: Ubuntu 4.2.0-7.7-generic 4.2.0
  Uname: Linux 4.2.0-7-generic x86_64
  ApportVersion: 2.18-0ubuntu9
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  benedikt   1550 F.... pulseaudio
   /dev/snd/controlC1:  benedikt   1550 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Sun Sep  6 16:22:48 2015
  HibernationDevice: UUID=3383b02e-b89c-462c-903a-cb936e81b2bf
  InstallationDate: Installed on 2014-12-21 (259 days ago)
  InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20141218)
  MachineType: LENOVO 20354
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-7-generic root=UUID=b549945a-67ac-4d14-849c-b54e561d47cc ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-7-generic N/A
   linux-backports-modules-4.2.0-7-generic  N/A
   linux-firmware                           1.147
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/21/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 9BCN91WW
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: Lancer 5A5
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900058WIN
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo Z50-70
  dmi.modalias: dmi:bvnLENOVO:bvr9BCN91WW:bd07/21/2015:svnLENOVO:pn20354:pvrLenovoZ50-70:rvnLENOVO:rnLancer5A5:rvr31900058WIN:cvnLENOVO:ct10:cvrLenovoZ50-70:
  dmi.product.name: 20354
  dmi.product.version: Lenovo Z50-70
  dmi.sys.vendor: LENOVO

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