dmesg output contains error: "*ERROR* mismatch in ips_enabled (expected 1, found 0)"

[ldierk]

The following error does appear in my dmesg output after every system start. I do not know if it has any consequences.

[ +0,145801] [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in ips_enabled (expected 1, found 0)
[ +0,000003] ------------[ cut here ]------------
[ +0,000016] WARNING: CPU: 0 PID: 980 at /build/linux-1vdNXv/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:12328 check_crtc_state+0x2c5/0x440 [i915]()
[ +0,000001] pipe state doesn't match!
[ +0,000001] Modules linked in: rfcomm bnep arc4 hp_wmi joydev sparse_keymap intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm snd_hda_co
[ +0,000041] drm_kms_helper e1000e ahci drm libahci ptp pps_core wmi video
[ +0,000007] CPU: 0 PID: 980 Comm: Xorg Tainted: G W 4.2.0-21-generic #25-Ubuntu
[ +0,000002] Hardware name: Hewlett-Packard HP EliteBook 850 G1/198F, BIOS L71 Ver. 01.30 12/09/2014
[ +0,000001] 0000000000000000 00000000af849558 ffff8802319977c8 ffffffff817e9449
[ +0,000003] 0000000000000000 ffff880231997820 ffff880231997808 ffffffff8107b3d6
[ +0,000002] ffff880231997848 ffff8802319978b0 ffff880230e64800 0000000000000001

[ +0,145801] [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in ips_enabled (expected 1, found 0)
[ +0,000003] ------------[ cut here ]------------
[ +0,000016] WARNING: CPU: 0 PID: 980 at /build/linux-1vdNXv/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:12328 check_crtc_state+0x2c5/0x440 [i915]()
[ +0,000001] pipe state doesn't match!
[ +0,000001] Modules linked in: rfcomm bnep arc4 hp_wmi joydev sparse_keymap intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm snd_hda_co
[ +0,000041] drm_kms_helper e1000e ahci drm libahci ptp pps_core wmi video
[ +0,000007] CPU: 0 PID: 980 Comm: Xorg Tainted: G W 4.2.0-21-generic #25-Ubuntu
[ +0,000002] Hardware name: Hewlett-Packard HP EliteBook 850 G1/198F, BIOS L71 Ver. 01.30 12/09/2014
[ +0,000001] 0000000000000000 00000000af849558 ffff8802319977c8 ffffffff817e9449
[ +0,000003] 0000000000000000 ffff880231997820 ffff880231997808 ffffffff8107b3d6
[ +0,000002] ffff880231997848 ffff8802319978b0 ffff880230e64800 0000000000000001
[ +0,000002] Call Trace:
[ +0,000006] [<ffffffff817e9449>] dump_stack+0x45/0x57
[ +0,000005] [<ffffffff8107b3d6>] warn_slowpath_common+0x86/0xc0
[ +0,000003] [<ffffffff8107b465>] warn_slowpath_fmt+0x55/0x70
[ +0,000013] [<ffffffffc024d941>] ? intel_pipe_config_compare+0xb31/0xc60 [i915]
[ +0,000011] [<ffffffffc024dd35>] check_crtc_state+0x2c5/0x440 [i915]
[ +0,000016] [<ffffffffc0261b5d>] intel_modeset_check_state+0x21d/0x6d0 [i915]
[ +0,000013] [<ffffffffc0262d17>] intel_crtc_set_config+0x4c7/0x580 [i915]
[ +0,000014] [<ffffffffc0051ef5>] ? drm_mode_create+0x25/0x60 [drm]
[ +0,000009] [<ffffffffc004b4a6>] drm_mode_set_config_internal+0x66/0x100 [drm]
[ +0,000010] [<ffffffffc004fb39>] drm_mode_setcrtc+0x3e9/0x500 [drm]
[ +0,000006] [<ffffffffc0040495>] drm_ioctl+0x125/0x610 [drm]
[ +0,000008] [<ffffffffc004f750>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
[ +0,000003] [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
[ +0,000003] [<ffffffff81087f71>] ? __set_task_blocked+0x41/0xa0
[ +0,000002] [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
[ +0,000003] [<ffffffff8108ab9e>] ? SyS_rt_sigprocmask+0x8e/0xc0
[ +0,000003] [<ffffffff817f0232>] entry_SYSCALL_64_fastpath+0x16/0x75
[ +0,000002] ---[ end trace cf5c10366430704f ]---

---
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: bs-ldi 2033 F.... pulseaudio
 /dev/snd/controlC0: bs-ldi 2033 F.... pulseaudio
CurrentDesktop: Unity
DistroRelease: Ubuntu 15.10
HibernationDevice: RESUME=UUID=6db9b5a5-d21c-4127-a751-53b667523027
InstallationDate: Installed on 2015-05-28 (201 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
MachineType: Hewlett-Packard HP EliteBook 850 G1
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-21-generic root=UUID=3aa3d587-358c-4744-a494-2ae77f32588c ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 4.2.0-21.25-generic 4.2.6
RelatedPackageVersions:
 linux-restricted-modules-4.2.0-21-generic N/A
 linux-backports-modules-4.2.0-21-generic N/A
 linux-firmware 1.149.3
Tags: wily
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
Uname: Linux 4.2.0-21-generic x86_64
UpgradeStatus: Upgraded to wily on 2015-10-23 (54 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo vboxusers wireshark
_MarkForUpload: True
dmi.bios.date: 09/01/2015
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: L71 Ver. 01.33
dmi.board.name: 198F
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 15.57
dmi.chassis.asset.tag: CNU425C9T6
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvrL71Ver.01.33:bd09/01/2015:svnHewlett-Packard:pnHPEliteBook850G1:pvrA3009DD10303:rvnHewlett-Packard:rn198F:rvrKBCVersion15.57:cvnHewlett-Packard:ct10:cvr:
dmi.product.name: HP EliteBook 850 G1
dmi.product.version: A3009DD10303
dmi.sys.vendor: Hewlett-Packard

[Brad Figg (brad-figg)]

This change was made by a bot.

[Alberto Salvia Novella (es20490446e)]

Please:

1. Edit this bug description, so it clarifies how to reproduce the error and which are the consequences of it.
2. Set the bug status back to "confirmed".

Thank you.

[ldierk (ldierk)]

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[ldierk (ldierk)]

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[ldierk (ldierk)]

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[ldierk (ldierk)]

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[ldierk (ldierk)]

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[ldierk (ldierk)]

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[ldierk (ldierk)]

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[ldierk (ldierk)]

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[ldierk (ldierk)]

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[ldierk (ldierk)]

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[ldierk (ldierk)]

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[ldierk (ldierk)]

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[ldierk (ldierk)]

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[ldierk (ldierk)]

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[ldierk (ldierk)]

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[ldierk (ldierk)]

Updated Bios to 01.33 Rev.A 1 Sep 2015 and ran apport-collect

[penalvch (penalvch)]

Lothar-dierkes, at your earliest convenience, could you please test the latest upstream kernel available from the very top line at the top of the page from http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D (the release names are irrelevant for testing, and please do not test the daily folder)? Install instructions are available at https://wiki.ubuntu.com/Kernel/MainlineBuilds . This will allow additional upstream developers to examine the issue.

If testing on your main install would be inconvenient, one may:
1) Install Ubuntu to a different partition and then test this there.
2) Backup, or clone the primary install.

If the latest kernel did not allow you to test to the issue (ex. you couldn't boot into the OS) please make a comment in your report about this, and continue to test the next most recent kernel version until you can test to the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this issue is fixed in the mainline kernel, please add the following tags by clicking on the yellow circle with a black pencil icon, next to the word Tags, located at the bottom of the report description:
kernel-fixed-upstream
kernel-fixed-upstream-X.Y-rcZ

Where X, and Y are the first two numbers of the kernel version, and Z is the release candidate number if it exists.

If the mainline kernel does not fix the issue, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-X.Y-rcZ

Please note, an error to install the kernel does not fit the criteria of kernel-bug-exists-upstream.

Once testing of the latest upstream kernel is complete, please mark this report's Status as Confirmed. Please let us know your results.

Thank you for your understanding.

[ldierk (ldierk)]

The error does not occur with the latest upstream kernel.

Installing the latest kernel yields the following warning:

run-parts: executing /etc/kernel/postinst.d/initramfs-tools 4.4.0-040400rc6-generic /boot/vmlinuz-4.4.0-040400rc6-generic
update-initramfs: Generating /boot/initrd.img-4.4.0-040400rc6-generic
W: Possible missing firmware /lib/firmware/i915/skl_guc_ver4.bin for module i915

[penalvch (penalvch)]

Lothar-dierkes, the next step is to fully reverse commit bisect from kernel 4.2 to 4.4-rc6 in order to identify the last bad commit, followed immediately by the first good one. Once this commit has been identified, then it may be reviewed as a candidate for backporting into your release. Could you please do this following https://wiki.ubuntu.com/Kernel/KernelBisection#How_do_I_reverse_bisect_the_upstream_kernel.3F ?

Please note, finding adjacent kernel versions is not fully commit bisecting.

Thank you for your understanding.

Helpful bug reporting tips:
https://wiki.ubuntu.com/ReportingBugs

[Launchpad Janitor (janitor)]

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