I'm sorry I don't undestand what you ask me? Did you not to need about
the kern.log file?

2016-09-01 2:22 UTC+01:00, Christopher M. Penalver
<email address hidden>:
> L'Africain, please post future comments and attachments in the report
> you created (not here).
>
> ** Attachment removed: "kernel.log_before_freeze"
>
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1585081/+attachment/4731432/+files/kernel.log_before_freeze
>
> ** Attachment removed: "kernel.log_before_freeze"
>
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1585081/+attachment/4731431/+files/kernel.log_before_freeze
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1585081
>
> Title:
>   Switching user freezes system
>
> Status in linux package in Ubuntu:
>   Expired
>
> Bug description:
>   Just doing this my system freezes:
>
>   1. Click on the top right gear icon.
>   2. Select a different user account.
>
>   Login screen appears briefly, then black screen and the system is
>   death:
>
>   BUG: unable to handle kernel NULL pointer dereference at 0000000000000248
>   IP: [<ffffffffc0258eb2>] amdgpu_vm_grab_id+0x122/0x310 [amdgpu]
>   PGD 0
>   Oops: 0000 [#1] SMP
>   Modules linked in:  ...
>   (See attached syslog for more)
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 16.04
>   Package: linux-image-4.4.0-22-generic 4.4.0-22.40
>   ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
>   Uname: Linux 4.4.0-22-generic x86_64
>   ApportVersion: 2.20.1-0ubuntu2
>   Architecture: amd64
>   AudioDevicesInUse:
>    USER        PID ACCESS COMMAND
>    /dev/snd/controlC0:  david      2739 F.... pulseaudio
>    /dev/snd/controlC1:  david      2739 F.... pulseaudio
>   CurrentDesktop: Unity
>   Date: Tue May 24 08:54:13 2016
>   HibernationDevice: RESUME=UUID=d225720a-fc40-49a3-9182-17d278d40460
>   InstallationDate: Installed on 2015-06-29 (329 days ago)
>   InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
>   MachineType: TOSHIBA SATELLITE S50-B
>   ProcFB: 0 inteldrmfb
>   ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-22-generic.efi.signed
> root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
>   RelatedPackageVersions:
>    linux-restricted-modules-4.4.0-22-generic N/A
>    linux-backports-modules-4.4.0-22-generic  N/A
>    linux-firmware                            1.157
>   SourcePackage: linux
>   UpgradeStatus: Upgraded to xenial on 2016-04-22 (31 days ago)
>   dmi.bios.date: 12/02/2014
>   dmi.bios.vendor: INSYDE Corp.
>   dmi.bios.version: 2.00
>   dmi.board.asset.tag: Type2 - Board Asset Tag
>   dmi.board.name: Type2 - Board Product Name1
>   dmi.board.vendor: Type2 - Board Vendor Name1
>   dmi.board.version: Type2 - Board Version
>   dmi.chassis.asset.tag: No Asset Tag
>   dmi.chassis.type: 10
>   dmi.chassis.vendor: OEM Chassis ManuFacturer
>   dmi.chassis.version: OEM Chassis Version
>   dmi.modalias:
> dmi:bvnINSYDECorp.:bvr2.00:bd12/02/2014:svnTOSHIBA:pnSATELLITES50-B:pvrPSPQEE-00F00JEN:rvnType2-BoardVendorName1:rnType2-BoardProductName1:rvrType2-BoardVersion:cvnOEMChassisManuFacturer:ct10:cvrOEMChassisVersion:
>   dmi.product.name: SATELLITE S50-B
>   dmi.product.version: PSPQEE-00F00JEN
>   dmi.sys.vendor: TOSHIBA
>
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>