screen flickers randomly

every 1 to 5 seconds screen flashes 1 to 3 times
each flash is very short, may be 10 out of 60 frames per second
if more than 1 flash, than time between flashes is about half a second
the more activity the more flashes
this happened also with 4.4.0-51 while 4.4.0-47 works without flickering

version
Ubuntu 4.4.0-53.74-generic 4.4.30

release
Description: Ubuntu 16.04.1 LTS
Release: 16.04

lspci-vnvn.log attached

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-53-generic 4.4.0-53.74
ProcVersionSignature: Ubuntu 4.4.0-53.74-generic 4.4.30
Uname: Linux 4.4.0-53-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: hendrik 1579 F.... pulseaudio
 /dev/snd/controlC0: hendrik 1579 F.... pulseaudio
 /dev/snd/controlC2: hendrik 1579 F.... pulseaudio
CurrentDesktop: Unity
Date: Tue Dec 6 09:09:58 2016
HibernationDevice: RESUME=UUID=759e9aeb-bcba-451e-b96f-dea4dea216ed
InstallationDate: Installed on 2016-07-28 (130 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
IwConfig:
 lo no wireless extensions.

 enp4s0 no wireless extensions.

 enx8000600fe800 no wireless extensions.
MachineType: System manufacturer System Product Name
ProcEnviron:
 LANGUAGE=de_AT:de
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_AT.UTF-8
 SHELL=/bin/bash
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-53-generic root=UUID=512b101c-7fa3-4ea6-82e6-2dac5f7db543 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-53-generic N/A
 linux-backports-modules-4.4.0-53-generic N/A
 linux-firmware 1.157.5
RfKill:

SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/23/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2001
dmi.board.asset.tag: Default string
dmi.board.name: B150M-A
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.:bvr2001:bd09/23/2016:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnB150M-A:rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer