Did this issue start happening after an update/upgrade?  Was there a
prior kernel version where you were not having this particular problem?

Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.11 kernel[0].

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as
"Confirmed".


Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.11-rc2

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Xenial)
       Status: New => Incomplete

** Changed in: linux (Ubuntu Xenial)
   Importance: Undecided => Medium

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1672200

Title:
  Kernel error on i915 gpu driver

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Xenial:
  Incomplete

Bug description:
  The following error (warning?) shows up in dmesg during every boot:

  [    3.244312] ------------[ cut here ]------------
  [    3.244397] WARNING: CPU: 0 PID: 170 at 
/build/linux-Nasqxe/linux-4.4.0/drivers/gpu/drm/i915/intel_fbdev.c:406 
intel_fb_initial_config+0x2d4/0x5f0 [i915]()
  [    3.244410] WARN_ON(!encoder->crtc)
  [    3.244413] Modules linked in:
  [    3.244419]  i915 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect 
sysimgblt fb_sys_fops b44 drm ahci ssb psmouse pata_acpi libahci mii wmi fjes 
video
  [    3.244451] CPU: 0 PID: 170 Comm: kworker/u4:6 Not tainted 
4.4.0-66-generic #87-Ubuntu
  [    3.244462] Hardware name: Hewlett-Packard HP Compaq nx7400 
(RB525UT#ABA)/30A2, BIOS 68YGU Ver. F.07 07/28/2006
  [    3.244477] Workqueue: events_unbound async_run_entry_fn
  [    3.244484]  c1adf967 ebf0fd93 00000286 f5da5d04 c13ac15f f5da5d44 
f8d3b99c f5da5d34
  [    3.244499]  c1070457 f8d46600 f5da5d64 000000aa f8d3b99c 00000196 
f8ceb9a4 f8ceb9a4
  [    3.244514]  00000000 00000001 00000001 f5da5d50 c10704ce 00000009 
f5da5d44 f8d46600
  [    3.244530] Call Trace:
  [    3.244541]  [<c13ac15f>] dump_stack+0x58/0x79
  [    3.244550]  [<c1070457>] warn_slowpath_common+0x87/0xc0
  [    3.244615]  [<f8ceb9a4>] ? intel_fb_initial_config+0x2d4/0x5f0 [i915]
  [    3.244678]  [<f8ceb9a4>] ? intel_fb_initial_config+0x2d4/0x5f0 [i915]
  [    3.244687]  [<c10704ce>] warn_slowpath_fmt+0x3e/0x60
  [    3.244750]  [<f8ceb9a4>] intel_fb_initial_config+0x2d4/0x5f0 [i915]
  [    3.244759]  [<c13ad8d4>] ? idr_alloc+0xa4/0x120
  [    3.244823]  [<f8ceb6d0>] ? intel_crtc_fb_gamma_get+0x40/0x40 [i915]
  [    3.244847]  [<f85c0d0f>] drm_setup_crtcs+0x21f/0xa90 [drm_kms_helper]
  [    3.244866]  [<f85b4d23>] ? 
drm_helper_probe_single_connector_modes_merge_bits+0x1e3/0x480 [drm_kms_helper]
  [    3.244879]  [<c17b9acd>] ? schedule+0x2d/0x80
  [    3.244898]  [<f85c182c>] drm_fb_helper_initial_config+0xbc/0x400 
[drm_kms_helper]
  [    3.244911]  [<c10a6f13>] ? put_prev_entity+0x33/0xcc0
  [    3.244919]  [<c10aa281>] ? pick_next_task_fair+0x501/0x520
  [    3.244982]  [<f8cec899>] intel_fbdev_initial_config+0x19/0x20 [i915]
  [    3.244991]  [<c108f6ce>] async_run_entry_fn+0x4e/0x170
  [    3.245000]  [<c10878a1>] process_one_work+0x121/0x3f0
  [    3.245009]  [<c1087ba7>] worker_thread+0x37/0x490
  [    3.245017]  [<c1087b70>] ? process_one_work+0x3f0/0x3f0
  [    3.245025]  [<c108d056>] kthread+0xa6/0xc0
  [    3.245034]  [<c17bd449>] ret_from_kernel_thread+0x21/0x38
  [    3.245042]  [<c108cfb0>] ? kthread_create_on_node+0x170/0x170
  [    3.245049] ---[ end trace 0bd04c67fb0cdbfa ]---
  [    3.251264] fbcon: inteldrmfb (fb0) is primary device
  [    3.251911] ------------[ cut here ]------------
  [    3.251933] WARNING: CPU: 0 PID: 170 at 
/build/linux-Nasqxe/linux-4.4.0/drivers/gpu/drm/drm_atomic_helper.c:723 
drm_atomic_helper_update_legacy_modeset_state+0x26a/0x280 [drm_kms_helper]()
  [    3.251945] Modules linked in: i915 i2c_algo_bit drm_kms_helper 
syscopyarea sysfillrect sysimgblt fb_sys_fops b44 drm ahci ssb psmouse 
pata_acpi libahci mii wmi fjes video
  [    3.251949] CPU: 0 PID: 170 Comm: kworker/u4:6 Tainted: G        W       
4.4.0-66-generic #87-Ubuntu
  [    3.251950] Hardware name: Hewlett-Packard HP Compaq nx7400 
(RB525UT#ABA)/30A2, BIOS 68YGU Ver. F.07 07/28/2006
  [    3.251956] Workqueue: events_unbound async_run_entry_fn
  [    3.251962]  c1adf967 ebf0fd93 00000286 f5da5b3c c13ac15f 00000000 
f85c51f0 f5da5b6c
  [    3.251966]  c1070457 c19d054c 00000000 000000aa f85c51f0 000002d3 
f85bb98a f85bb98a
  [    3.251970]  f67f8800 00000000 f07fc400 f5da5b7c c1070562 00000009 
00000000 f5da5ba4
  [    3.251971] Call Trace:
  [    3.251977]  [<c13ac15f>] dump_stack+0x58/0x79
  [    3.251981]  [<c1070457>] warn_slowpath_common+0x87/0xc0
  [    3.251994]  [<f85bb98a>] ? 
drm_atomic_helper_update_legacy_modeset_state+0x26a/0x280 [drm_kms_helper]
  [    3.252007]  [<f85bb98a>] ? 
drm_atomic_helper_update_legacy_modeset_state+0x26a/0x280 [drm_kms_helper]
  [    3.252010]  [<c1070562>] warn_slowpath_null+0x22/0x30
  [    3.252023]  [<f85bb98a>] 
drm_atomic_helper_update_legacy_modeset_state+0x26a/0x280 [drm_kms_helper]
  [    3.252023]  [<f8cd6818>] ? intel_pre_plane_update+0xd8/0x130 [i915]
  [    3.252023]  [<f8cd720a>] intel_atomic_commit+0x52a/0x6a0 [i915]
  [    3.252023]  [<f8acf48e>] ? drm_atomic_check_only+0x1ae/0x600 [drm]
  [    3.252023]  [<f8ace129>] ? drm_modeset_lock+0x49/0xd0 [drm]
  [    3.252023]  [<f8acea6c>] ? drm_atomic_set_crtc_for_connector+0x5c/0xe0 
[drm]
  [    3.252023]  [<f8acf912>] drm_atomic_commit+0x32/0x60 [drm]
  [    3.252023]  [<f85bf673>] restore_fbdev_mode+0x253/0x290 [drm_kms_helper]
  [    3.252023]  [<f8ace244>] ? drm_modeset_lock_all_ctx+0x94/0xb0 [drm]
  [    3.252023]  [<f85c16c7>] 
drm_fb_helper_restore_fbdev_mode_unlocked+0x27/0x70 [drm_kms_helper]
  [    3.252023]  [<f85c173d>] drm_fb_helper_set_par+0x2d/0x60 [drm_kms_helper]
  [    3.252023]  [<f8cebd75>] intel_fbdev_set_par+0x15/0x50 [i915]
  [    3.252023]  [<c142920d>] fbcon_init+0x54d/0x5a0
  [    3.252023]  [<c17b31ce>] ? klist_node_init+0x2e/0x50
  [    3.252023]  [<c14b3d6b>] visual_init+0xbb/0x120
  [    3.252023]  [<c14b5ae2>] do_bind_con_driver+0x172/0x350
  [    3.252023]  [<c13aeb91>] ? kobject_set_name_vargs+0x61/0x90
  [    3.252023]  [<c14b5fce>] do_take_over_console+0x13e/0x1c0
  [    3.252023]  [<c142515f>] do_fbcon_takeover+0x5f/0xc0
  [    3.252023]  [<c1429c67>] fbcon_event_notify+0x687/0x780
  [    3.252023]  [<c108de0e>] notifier_call_chain+0x4e/0x70
  [    3.252023]  [<c108e149>] __blocking_notifier_call_chain+0x39/0x60
  [    3.252023]  [<c108e18f>] blocking_notifier_call_chain+0x1f/0x30
  [    3.252023]  [<c142ef26>] fb_notifier_call_chain+0x16/0x20
  [    3.252023]  [<c1430ca1>] register_framebuffer+0x1f1/0x330
  [    3.252023]  [<f85c19dc>] drm_fb_helper_initial_config+0x26c/0x400 
[drm_kms_helper]
  [    3.252023]  [<c10a6f13>] ? put_prev_entity+0x33/0xcc0
  [    3.252023]  [<f8cec899>] intel_fbdev_initial_config+0x19/0x20 [i915]
  [    3.252023]  [<c108f6ce>] async_run_entry_fn+0x4e/0x170
  [    3.252023]  [<c10878a1>] process_one_work+0x121/0x3f0
  [    3.252023]  [<c1087ba7>] worker_thread+0x37/0x490
  [    3.252023]  [<c1087b70>] ? process_one_work+0x3f0/0x3f0
  [    3.252023]  [<c108d056>] kthread+0xa6/0xc0
  [    3.252023]  [<c17bd449>] ret_from_kernel_thread+0x21/0x38
  [    3.252023]  [<c108cfb0>] ? kthread_create_on_node+0x170/0x170
  [    3.252565] ---[ end trace 0bd04c67fb0cdbfb ]---

  /proc/version_signature : Ubuntu 4.4.0-66.87-generic 4.4.44
  Description:  Ubuntu 16.04.2 LTS
  Release:      16.04

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-66-generic 4.4.0-66.87
  ProcVersionSignature: Ubuntu 4.4.0-66.87-generic 4.4.44
  Uname: Linux 4.4.0-66-generic i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 
k4.4.0-66-generic.
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  davek      2175 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0xf4580000 irq 27'
     Mixer name : 'Analog Devices AD1981'
     Components : 'HDA:11d41981,103c30a2,00100200 
HDA:11c13026,103c30a2,00100700'
     Controls      : 34
     Simple ctrls  : 17
  CurrentDesktop: LXDE
  Date: Sun Mar 12 15:14:43 2017
  HibernationDevice: RESUME=UUID=63b899e1-b597-4a6c-9295-5403efb298d6
  InstallationDate: Installed on 2016-07-12 (243 days ago)
  InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Release i386 
(20160420.3)
  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: Hewlett-Packard HP Compaq nx7400 (RB525UT#ABA)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-66-generic 
root=UUID=e8da51fc-5ebb-4d97-aaeb-0ba3f9856171 ro
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-66-generic N/A
   linux-backports-modules-4.4.0-66-generic  N/A
   linux-firmware                            1.157.8
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/28/2006
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68YGU Ver. F.07
  dmi.board.name: 30A2
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 40.16
  dmi.chassis.asset.tag: CNU6362XLV
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: 
dmi:bvnHewlett-Packard:bvr68YGUVer.F.07:bd07/28/2006:svnHewlett-Packard:pnHPCompaqnx7400(RB525UT#ABA):pvrF.07:rvnHewlett-Packard:rn30A2:rvrKBCVersion40.16:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP Compaq nx7400 (RB525UT#ABA)
  dmi.product.version: F.07
  dmi.sys.vendor: Hewlett-Packard

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