Black screen after lockscreen

I am right sure, I am only using the internal nvidia card, as the intel card cannot handle my "super" 3K screen.
So after the screen turned off (after locking and coming back, for example) the screen is just black.

But after switching to tty and back (ctrl,alt+f1, ctrl, alt+f7), everything just works fine.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: nvidia-352 352.41-0ubuntu1
ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
Uname: Linux 4.2.0-16-generic x86_64
NonfreeKernelModules: nvidia
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 352.41 Fri Aug 21 23:09:52 PDT 2015
 GCC version: gcc version 5.2.1 20151010 (Ubuntu 5.2.1-22ubuntu1)
ApportVersion: 2.19.1-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Oct 18 17:31:04 2015
DistUpgraded: 2015-07-20 21:13:05,161 DEBUG enabling apt cron job
DistroCodename: wily
DistroVariant: ubuntu
DkmsStatus:
 btusb-lp1506615, 0.1, 4.2.0-16-generic, x86_64: installed
 nvidia-352, 352.41, 4.2.0-16-generic, x86_64: installed
 virtualbox, 5.0.4, 4.2.0-14-generic, x86_64: installed
 virtualbox, 5.0.4, 4.2.0-16-generic, x86_64: installed
EcryptfsInUse: Yes
GraphicsCard:
 NVIDIA Corporation GK106GLM [Quadro K2100M] [10de:11fc] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:05cc]
InstallationDate: Installed on 2014-06-13 (491 days ago)
InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
MachineType: Dell Inc. Precision M4800
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-16-generic root=/dev/mapper/xubuntu--vg-root ro recovery nomodeset
SourcePackage: nvidia-graphics-drivers-352
UpgradeStatus: Upgraded to wily on 2015-07-20 (89 days ago)
dmi.bios.date: 09/29/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A15
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA15:bd09/29/2015:svnDellInc.:pnPrecisionM4800:pvr00:rvnDellInc.:rn:rvr:cvnDellInc.:ct9:cvr:
dmi.product.name: Precision M4800
dmi.product.version: 00
dmi.sys.vendor: Dell Inc.
modified.conffile..etc.modprobe.d.nvidia.352.hybrid.conf: [deleted]
version.compiz: compiz 1:0.9.12.2+15.10.20151015-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.64+git20150829.508a5f77-0ubuntu0ricotz
version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
xserver.bootTime: Sun Oct 18 09:05:00 2015
xserver.configfile: default
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:

xserver.version: 2:1.17.2-1ubuntu9