I have reported the bug upstream but I have no answer from the kernel
maintainers.
In the meantime my workaround was to install las kernel 4.1 from Ubuntu
Kernel Archive.

Cheers.
Gaston.

On Sat, Jan 23, 2016, 3:55 AM Anton Shu <email address hidden> wrote:

> Hey, I think I am also affected by this bug. I run Ubuntu 15.10 on a
> Thinkpad yoga (first gen) with kernel 4.2.0-25-generic. When waking up
> after hibernating the screen goes completely black after entering the
> encryption passphrase. Ctrl+Alt+F1 does not work. I also can't change
> the Fn-Lock of the keyboard as indicated by a separate LED. I can only
> poweroff by pressing the powerbutton for some time. I will gladly supply
> any more information if needed.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1495458
>
> Title:
>   Black screen when resuming after sleep
>
> Status in linux package in Ubuntu:
>   Triaged
>
> Bug description:
>   I have a fresh install of Kubuntu Wily Beta 1. My laptop is a Dell XPS
>   15 with a Nvidia video. I tried both drivers nouveau and nvidia with
>   the same result.
>
>   I can reproduce the error ALWAYS, when I put the laptop to sleep it
>   wont resume, I can see the power light and the keyboard backlight
>   turning on as if it will wake up, but then just a black screen. I
>   cannot even switch to a terminal (Ctr+Alt+F1), the only solution it to
>   restart.
>
>   The problem is not only when sleeping, it also happens when the screen
>   is turned off by Power Management.
>
>   ---
>   ApportVersion: 2.18.1-0ubuntu1
>   Architecture: amd64
>   CompizPlugins: No value set for
> `/apps/compiz-1/general/screen0/options/active_plugins'
>   CompositorRunning: None
>   CurrentDesktop: KDE
>   DistUpgraded: Fresh install
>   DistroCodename: wily
>   DistroRelease: Ubuntu 15.10
>   DistroVariant: kubuntu
>   DkmsStatus:
>    bbswitch, 0.7, 4.2.0-10-generic, x86_64: installed
>    bcmwl, 6.30.223.248+bdcom, 4.2.0-10-generic, x86_64: installed
>    nvidia-352, 352.30, 4.2.0-10-generic, x86_64: installed
>   ExtraDebuggingInterest: No
>   GraphicsCard:
>    Intel Corporation 4th Gen Core Processor Integrated Graphics Controller
> [8086:0416] (rev 06) (prog-if 00 [VGA controller])
>      Subsystem: Dell Device [1028:05fe]
>   InstallationDate: Installed on 2015-09-12 (7 days ago)
>   InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Alpha amd64
> (20150825.1)
>   MachineType: Dell Inc. XPS 15 9530
>   NonfreeKernelModules: wl
>   Package: xorg 1:7.7+7ubuntu4
>   PackageArchitecture: amd64
>   ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-10-generic
> root=UUID=21f7ffd1-602b-4aec-a5a8-1db43113dc9c ro quiet splash
>   ProcVersionSignature: Ubuntu 4.2.0-10.12-generic 4.2.0
>   Tags:  wily kubuntu single-occurrence reproducible has-workaround
>   UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
>   Uname: Linux 4.2.0-10-generic x86_64
>   UpgradeStatus: No upgrade log present (probably fresh install)
>   UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
>   _MarkForUpload: True
>   dmi.bios.date: 07/30/2015
>   dmi.bios.vendor: Dell Inc.
>   dmi.bios.version: A09
>   dmi.board.name: XPS 15 9530
>   dmi.board.vendor: Dell Inc.
>   dmi.board.version: A09
>   dmi.chassis.type: 8
>   dmi.chassis.vendor: Dell Inc.
>   dmi.chassis.version: Not Specified
>   dmi.modalias:
> dmi:bvnDellInc.:bvrA09:bd07/30/2015:svnDellInc.:pnXPS159530:pvrA09:rvnDellInc.:rnXPS159530:rvrA09:cvnDellInc.:ct8:cvrNotSpecified:
>   dmi.product.name: XPS 15 9530
>   dmi.product.version: A09
>   dmi.sys.vendor: Dell Inc.
>   version.compiz: compiz N/A
>   version.ia32-libs: ia32-libs N/A
>   version.libdrm2: libdrm2 2.4.64-1
>   version.libgl1-mesa-dri: libgl1-mesa-dri 10.6.3-1ubuntu1
>   version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
>   version.libgl1-mesa-glx: libgl1-mesa-glx 10.6.3-1ubuntu1
>   version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu7
>   version.xserver-xorg-input-evdev: xserver-xorg-input-evdev
> 1:2.9.2-1ubuntu1
>   version.xserver-xorg-video-ati: xserver-xorg-video-ati
> 1:7.5.0+git20150819-0ubuntu1
>   version.xserver-xorg-video-intel: xserver-xorg-video-intel
> 2:2.99.917+git20150808-0ubuntu2
>   version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau
> 1:1.0.11-1ubuntu3
>   xserver.bootTime: Sun Sep 20 12:15:49 2015
>   xserver.configfile: default
>   xserver.errors:
>
>   xserver.logfile: /var/log/Xorg.0.log
>   xserver.outputs:
>    product id                                5169
>    vendor                                     SHP
>   xserver.version: 2:1.17.2-1ubuntu7
>
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>