It locked up with 4.4.0-040400-generic
I'll try the latest one which looks like will be 4.6.0-040600rc1

I just had an X crash with a single dvi monitor just now triggered by
logging out from an nx session
I think that one is an intel video driver bug. I have no idea if the hard
lockup is also a intel video driver bug.


[ 83243.377] (EE)
[ 83243.377] (EE) Backtrace:
[ 83243.377] (EE) 0: /usr/bin/X (xorg_backtrace+0x4e) [0x564984a8f68e]
[ 83243.378] (EE) 1: /usr/bin/X (0x5649848db000+0x1b89f9) [0x564984a939f9]
[ 83243.378] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6
(0x7fcb1ec7e000+0x352f0) [0x7fcb1ecb32f0]
[ 83243.378] (EE) 3: /lib/x86_64-linux-gnu/libc.so.6
(0x7fcb1ec7e000+0x7f16b) [0x7fcb1ecfd16b]
[ 83243.378] (EE) 4: /lib/x86_64-linux-gnu/libc.so.6
(0x7fcb1ec7e000+0x80eb8) [0x7fcb1ecfeeb8]
[ 83243.378] (EE) 5: /lib/x86_64-linux-gnu/libc.so.6 (cfree+0x4c)
[0x7fcb1ed0283c]
[ 83243.378] (EE) 6: /usr/bin/X (0x5649848db000+0x1b4a88) [0x564984a8fa88]
[ 83243.378] (EE) 7: /usr/bin/X (CloseDownClient+0x11a) [0x5649849326ea]
[ 83243.378] (EE) 8: /usr/bin/X (0x5649848db000+0x57fe9) [0x564984932fe9]
[ 83243.378] (EE) 9: /usr/bin/X (0x5649848db000+0x5c34b) [0x56498493734b]
[ 83243.378] (EE) 10: /lib/x86_64-linux-gnu/libc.so.6
(__libc_start_main+0xf0) [0x7fcb1ec9ea40]
[ 83243.378] (EE) 11: /usr/bin/X (_start+0x29) [0x5649849216c9]
[ 83243.378] (EE)
[ 83243.378] (EE) Segmentation fault at address 0x0
[ 83243.378] (EE)
Fatal server error:
[ 83243.378] (EE) Caught signal 11 (Segmentation fault). Server aborting
[ 83243.378] (EE)
[ 83243.378] (EE)
Please consult the The X.Org Foundation support
         at http://wiki.x.org
 for help.
[ 83243.378] (EE) Please also check the log file at "/var/log/Xorg.0.log"
for additional information.
[ 83243.378] (EE)
[ 83243.378] (II) AIGLX: Suspending AIGLX clients for VT switch
[ 83243.410] (EE) Server terminated with error (1). Closing log file.


On Wed, Mar 30, 2016 at 5:53 AM, Joseph Salisbury <
[email protected]> wrote:

> 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
> v4.6 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/v4.6-rc1-wily/
>
> ** Changed in: linux (Ubuntu)
>    Importance: Undecided => Medium
>
> ** Tags added: kernel-da-key
>
> ** Changed in: linux (Ubuntu)
>        Status: Confirmed => Incomplete
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1563146
>
> Title:
>   lockup when using DVI and display port with skylake
>
> Status in linux package in Ubuntu:
>   Incomplete
>
> Bug description:
>   When using dual monitors, one connected to the dvi port, and one
> connected to the display port,
>   and when nxclient 3.5.0-7 is running, the kernel will lock up about once
> a day, sometimes more often.
>
>   after it has locked up, the mouse cursor doesn't move, caps lock doesn't
> toggle the keyboard light, the pc can't be pinged,
>   there is nothing written in the logs about the crash.
>
>   If nxclient isn't running, it doesn't lock up. I don't think it has
>   locked up since switching to vga and dvi.
>
>   I believe this is a skylake problem. I'm able to help test and debug
>   if required and given instructions.
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 15.10
>   Package: linux-image-4.2.0-34-generic 4.2.0-34.39
>   ProcVersionSignature: Ubuntu 4.2.0-34.39-generic 4.2.8-ckt4
>   Uname: Linux 4.2.0-34-generic x86_64
>   ApportVersion: 2.19.1-0ubuntu5
>   Architecture: amd64
>   AudioDevicesInUse:
>    USER        PID ACCESS COMMAND
>    /dev/snd/controlC0:  michael    1805 F.... pulseaudio
>   CurrentDesktop: GNOME
>   Date: Tue Mar 29 12:26:58 2016
>   HibernationDevice: RESUME=UUID=d420eadc-7df8-467a-a6f6-f8e02376eb4a
>   InstallationDate: Installed on 2016-01-12 (76 days ago)
>   InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64
> (20151021)
>   IwConfig:
>    enp3s0    no wireless extensions.
>
>    lo        no wireless extensions.
>   Lsusb:
>    Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
>    Bus 001 Device 003: ID 046d:c31c Logitech, Inc. Keyboard K120
>    Bus 001 Device 004: ID 046d:c03d Logitech, Inc. M-BT96a Pilot Optical
> Mouse
>    Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
>   MachineType: System manufacturer System Product Name
>   ProcFB: 0 inteldrmfb
>   ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-34-generic
> root=/dev/mapper/ubuntu--vg-root ro i915.preliminary_hw_support=1
> i915.ips=0 quiet splash vt.handoff=7
>   RelatedPackageVersions:
>    linux-restricted-modules-4.2.0-34-generic N/A
>    linux-backports-modules-4.2.0-34-generic  N/A
>    linux-firmware                            1.149.3
>   RfKill:
>
>   SourcePackage: linux
>   UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
>   UpgradeStatus: No upgrade log present (probably fresh install)
>   dmi.bios.date: 11/16/2015
>   dmi.bios.vendor: American Megatrends Inc.
>   dmi.bios.version: 0902
>   dmi.board.asset.tag: Default string
>   dmi.board.name: H170M-E D3
>   dmi.board.vendor: ASUSTeK COMPUTER INC.
>   dmi.board.version: Rev X.0x
>   dmi.chassis.asset.tag: Default string
>   dmi.chassis.type: 3
>   dmi.chassis.vendor: Default string
>   dmi.chassis.version: Default string
>   dmi.modalias:
> dmi:bvnAmericanMegatrendsInc.:bvr0902:bd11/16/2015:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnH170M-ED3:rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring:
>   dmi.product.name: System Product Name
>   dmi.product.version: System Version
>   dmi.sys.vendor: System manufacturer
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1563146/+subscriptions
>

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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1563146

Title:
  lockup when using DVI and display port with skylake

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1563146/+subscriptions

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