Comment # 8 on bug 981358 from Robby Engelmann

Hardware: Tuxedo Infinity Book v2
Intel Core i-CPU der 6. Generation Skylake
Intel Core Core i7-6500U, 4 Thread-CPU
Intel HD 520 Grafik

relevant hwinfo output:
15: PCI 02.0: 0300 VGA compatible controller (VGA)
  [Created at pci.366]
  Unique ID: _Znp.eU7cJTgd1IC
  SysFS ID: /devices/pci0000:00/0000:00:02.0
  SysFS BusID: 0000:00:02.0
  Hardware Class: graphics card
  Device Name: "Onboard IGD"
  Model: "Intel Sky Lake Integrated Graphics"
  Vendor: pci 0x8086 "Intel Corporation"
  Device: pci 0x1916 "Sky Lake Integrated Graphics"
  SubVendor: pci 0x8086 "Intel Corporation"
  SubDevice: pci 0x1916 
  Revision: 0x07
  Driver: "i915"
  Driver Modules: "drm"
  Memory Range: 0xde000000-0xdeffffff (rw,non-prefetchable)
  Memory Range: 0xc0000000-0xcfffffff (ro,non-prefetchable)
  I/O Ports: 0xf000-0xf03f (rw)
  Memory Range: 0x000c0000-0x000dffff (rw,non-prefetchable,disabled)
  IRQ: 125 (889782 events)
  I/O Ports: 0x3c0-0x3df (rw)
  Module Alias: "pci:v00008086d00001916sv00008086sd00001916bc03sc00i00"
  Driver Info #0:
    Driver Status: i915 is active
    Driver Activation Cmd: "modprobe i915"
  Config Status: cfg=new, avail=yes, need=no, active=unknown


26: None 00.0: 10002 LCD Monitor
  [Created at monitor.125]
  Unique ID: rdCR._PPpK1VipP8
  Parent ID: _Znp.eU7cJTgd1IC
  Hardware Class: monitor
  Model: "CMN LCD Monitor"
  Vendor: CMN "CMN"
  Device: eisa 0x1361 
  Resolution: 1920x1080@60Hz
  Size: 293x165 mm
  Year of Manufacture: 2014
  Week of Manufacture: 7
  Detailed Timings #0:
     Resolution: 1920x1080
     Horizontal: 1920 1966 1996 2080 (+46 +76 +160) -hsync
       Vertical: 1080 1082 1086 1112 (+2 +6 +32) -vsync
    Frequencies: 92.52 MHz, 44.48 kHz, 40.00 Hz
  Year of Manufacture: 2014
  Week of Manufacture: 7
  Detailed Timings #1:
     Resolution: 1920x1080
     Horizontal: 1920 1966 1996 2080 (+46 +76 +160) -hsync
       Vertical: 1080 1082 1086 1112 (+2 +6 +32) -vsync
    Frequencies: 138.78 MHz, 66.72 kHz, 60.00 Hz
  Config Status: cfg=new, avail=yes, need=no, active=unknown
  Attached to: #15 (VGA compatible controller)


However, the yesterday and today I did not see this problem again. I do not
know how to trigger it.