Ubuntu 15.10 hangs on shutdown

[Sash]

Ubuntu 15.10 hangs on shutdown with both generic and lowlatency kernels. In order to shutdown without forcing by pressing long on the laptop button, I need to restart, and then to shutdown, and then the shutdown takes more than a minute, which isn't the case with 14.04 which shutdowns in just few seconds. This happens with both fresh install and updated system.
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ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: m 1472 F.... pulseaudio
CurrentDesktop: Unity
DistroRelease: Ubuntu 15.10
HibernationDevice: RESUME=UUID=def28845-51c2-4e63-b7c4-b6170784fa4a
InstallationDate: Installed on 2015-12-16 (0 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
MachineType: Acer Aspire E1-570
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-19-lowlatency root=UUID=2eb5def1-1551-4c4d-ae5d-1989c495b47a ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 4.2.0-19.23-lowlatency 4.2.6
RelatedPackageVersions:
 linux-restricted-modules-4.2.0-19-lowlatency N/A
 linux-backports-modules-4.2.0-19-lowlatency N/A
 linux-firmware 1.149.3
Tags: wily
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
Uname: Linux 4.2.0-19-lowlatency x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 10/08/2013
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: V2.06
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: EA50_CX
dmi.board.vendor: Acer
dmi.board.version: V2.06
dmi.chassis.asset.tag: Acer Asset Tag String
dmi.chassis.type: 10
dmi.chassis.vendor: Insyde Corp.
dmi.chassis.version: V2.06
dmi.modalias: dmi:bvnInsydeCorp.:bvrV2.06:bd10/08/2013:svnAcer:pnAspireE1-570:pvrV2.06:rvnAcer:rnEA50_CX:rvrV2.06:cvnInsydeCorp.:ct10:cvrV2.06:
dmi.product.name: Aspire E1-570
dmi.product.version: V2.06
dmi.sys.vendor: Acer

[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 1526661

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.

[Sash (sashhhh)]

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[Joseph Salisbury (jsalisbury)]

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 v4.4 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/v4.4-rc5-wily

[Sash (sashhhh)]

The issue started with installing of the 15.10 iso, as downloaded from the Ubuntu servers, I believe it's a version of 4. 2. 0. kernel. The last update that had the same problem was 4.2.0-21-lowlatency. Now I have installed the latest kernel, 4.4.0. as you suggested, and the problem is solved, thank you.

The only problem, that the Terminal report about during the installing of the new kernel, is this:

"W: Possible missing firmware /lib/firmware/i915/skl_guc_ver4.bin for module i915"

[Sash (sashhhh)]

P.S. I'm sorry, but I can't add the suggested tag, it is not listed in the status list, so I added "fix-committed". If it is not correct one, please correct it. Thank you!