WARNING: CPU: 0 PID: 233 at /build/linux-lts-vivid-pTjnAT/linux-lts-vivid-3.19.0/drivers/gpu/drm/i915/intel_crt.c:145 hsw_crt_pre_enable+0x7f/0x90 [i915]()

[jcat]

When I connect a monitor the VGA port on the laptop - this is found in dmesg, and some of the kernel modules linked in become unstable [ btrfs for instance, if it's in use].

[ 2.962400] ------------[ cut here ]------------
[ 2.962424] WARNING: CPU: 0 PID: 233 at /build/linux-lts-vivid-pTjnAT/linux-lts-vivid-3.19.0/drivers/gpu/drm/i915/intel_crt.c:145 hsw_crt_pre_enable+0x7f/0x90 [i915]()
[ 2.962425] SPLL already enabled
[ 2.962426] Modules linked in: uas usb_storage hid_generic usbhid hid i915 psmouse i2c_algo_bit e1000e drm_kms_helper ahci libahci sdhci_pci drm ptp pps_core pata_acpi wmi sdhci_acpi video sdhci
[ 2.962437] CPU: 0 PID: 233 Comm: plymouthd Not tainted 3.19.0-37-generic #42~14.04.1-Ubuntu
[ 2.962438] Hardware name: Dell Inc. Latitude E6540/0PXPYJ, BIOS A15 05/19/2015
[ 2.962439] ffffffffc02fd7f8 ffff880220d23ab8 ffffffff817af92b 0000000000003a7a
[ 2.962440] ffff880220d23b08 ffff880220d23af8 ffffffff81074e0a 0000000000000046
[ 2.962442] ffff880035fb0000 ffff88003615eb60 ffff880035f8f400 ffff88003615e800
[ 2.962444] Call Trace:
[ 2.962449] [<ffffffff817af92b>] dump_stack+0x45/0x57
[ 2.962452] [<ffffffff81074e0a>] warn_slowpath_common+0x8a/0xc0
[ 2.962453] [<ffffffff81074e86>] warn_slowpath_fmt+0x46/0x50
[ 2.962464] [<ffffffffc02b601f>] hsw_crt_pre_enable+0x7f/0x90 [i915]
[ 2.962475] [<ffffffffc02a1a7c>] haswell_crtc_enable+0x3fc/0xaf0 [i915]
[ 2.962485] [<ffffffffc029f1a2>] __intel_set_mode+0x872/0xc60 [i915]
[ 2.962495] [<ffffffffc02a5af2>] intel_crtc_set_config+0x9e2/0xf60 [i915]
[ 2.962506] [<ffffffffc010382f>] drm_mode_set_config_internal+0x6f/0x110 [drm]
[ 2.962511] [<ffffffffc019e5c8>] restore_fbdev_mode+0xc8/0xf0 [drm_kms_helper]
[ 2.962515] [<ffffffffc01a04e9>] drm_fb_helper_restore_fbdev_mode_unlocked+0x29/0x80 [drm_kms_helper]
[ 2.962525] [<ffffffffc02b31ee>] intel_fbdev_restore_mode+0x1e/0x50 [i915]
[ 2.962536] [<ffffffffc02d787e>] i915_driver_lastclose+0xe/0x20 [i915]
[ 2.962541] [<ffffffffc00f6c4e>] drm_lastclose+0x2e/0x130 [drm]
[ 2.962546] [<ffffffffc00f7088>] drm_release+0x338/0x540 [drm]
[ 2.962549] [<ffffffff811ee077>] __fput+0xe7/0x220
[ 2.962551] [<ffffffff811ee1fe>] ____fput+0xe/0x10
[ 2.962553] [<ffffffff81091e3c>] task_work_run+0xac/0xd0
[ 2.962556] [<ffffffff81015007>] do_notify_resume+0x97/0xb0
[ 2.962558] [<ffffffff817b762f>] int_signal+0x12/0x17
[ 2.962559] ---[ end trace b6b778d930eaeda7 ]---

This is the lts-vivid kernel. downgrading to the lts-utopic kernel fixes the issue.
I tried the wily-lts, same issue.

I've also tried to recent kernels in http://kernel.ubuntu.com/~kernel-ppa :

linux-image-4.3.0-040300-generic_4.3.0-040300 is still broken

linux-image-4.4.0-040400rc3-generic_4.4.0-040400rc3.201511300321 works fine! :)
---
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: jcat 2559 F.... pulseaudio
 /dev/snd/controlC1: jcat 2559 F.... pulseaudio
CurrentDesktop: GNOME
DistroRelease: Ubuntu 14.04
HibernationDevice: RESUME=UUID=b338325d-c293-4b5b-ab0a-542a7f02236f
InstallationDate: Installed on 2015-11-25 (8 days ago)
InstallationMedia: Ubuntu 14.04.3 LTS "Trusty Tahr" - Beta amd64 (20150805)
MachineType: Dell Inc. Latitude E6540
NonfreeKernelModules: fglrx
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-39-generic.efi.signed root=UUID=8c468c94-323c-4526-b3a2-e1eddacbed42 ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 3.19.0-39.44~14.04.1-generic 3.19.8-ckt9
RelatedPackageVersions:
 linux-restricted-modules-3.19.0-39-generic N/A
 linux-backports-modules-3.19.0-39-generic N/A
 linux-firmware 1.127.19
Tags: trusty
Uname: Linux 3.19.0-39-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 05/19/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A15
dmi.board.name: 0PXPYJ
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA15:bd05/19/2015:svnDellInc.:pnLatitudeE6540:pvr01:rvnDellInc.:rn0PXPYJ:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E6540
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1522094

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[jcat (jcat-l-deactivatedaccount)]

apport information

[jcat (jcat-l-deactivatedaccount)]

apport information

[jcat (jcat-l-deactivatedaccount)]

apport information

[jcat (jcat-l-deactivatedaccount)]

apport information

[jcat (jcat-l-deactivatedaccount)]

apport information

[jcat (jcat-l-deactivatedaccount)]

apport information

[jcat (jcat-l-deactivatedaccount)]

apport information

[jcat (jcat-l-deactivatedaccount)]

apport information

[jcat (jcat-l-deactivatedaccount)]

apport information

[jcat (jcat-l-deactivatedaccount)]

apport information

[jcat (jcat-l-deactivatedaccount)]

apport information

[jcat (jcat-l-deactivatedaccount)]

apport information

[jcat (jcat-l-deactivatedaccount)]

apport information

[jcat (jcat-l-deactivatedaccount)]

apport information

[jcat (jcat-l-deactivatedaccount)]

apport information

[jcat (jcat-l-deactivatedaccount)]

apport information

[jcat (jcat-l-deactivatedaccount)]

apport-collect info added

[jcat (jcat-l-deactivatedaccount)]

# dmidecode -s bios-version
A16
# dmidecode -s bios-release-date
09/01/2015

[jcat (jcat-l-deactivatedaccount)]

BIOS updated, but the symptoms are exactly the same.

[penalvch (penalvch)]

jcat, 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 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.

[penalvch (penalvch)]

jcat, the next step is to fully reverse commit bisect from kernel 3.19 to 4.4-rc3 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)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]