I have this problem on my laptop HP Elitebook 820 g1. It's actual only for Ubuntu and not for Windows. It shows unpredictably and sometime pass away by itself. Now I cure it with screen blocking, and after reauthorization artefacts vanishes for a few minutes.

There is Intel i5-4200u inside. And it has built-in Intel HD4400 graphics.

Here is hwinfo:

18: PCI 02.0: 0300 VGA compatible controller (VGA)
  [Created at pci.378]
  Unique ID: _Znp.a5WYeTUftW2
  SysFS ID: /devices/pci0000:00/0000:00:02.0
  SysFS BusID: 0000:00:02.0
  Hardware Class: graphics card
  Device Name: "32"
  Model: "Intel Haswell-ULT Integrated Graphics Controller"
  Vendor: pci 0x8086 "Intel Corporation"
  Device: pci 0x0a16 "Haswell-ULT Integrated Graphics Controller"
  SubVendor: pci 0x103c "Hewlett-Packard Company"
  SubDevice: pci 0x1991 
  Revision: 0x09
  Driver: "i915"
  Driver Modules: "i915"
  Memory Range: 0xd0000000-0xd03fffff (rw,non-prefetchable)
  Memory Range: 0xc0000000-0xcfffffff (ro,non-prefetchable)
  I/O Ports: 0x3000-0x303f (rw)
  Memory Range: 0x000c0000-0x000dffff (rw,non-prefetchable,disabled)
  IRQ: 47 (51616 events)
  Module Alias: "pci:v00008086d00000A16sv0000103Csd00001991bc03sc00i00"
  Driver Info #0:
    Driver Status: i915 is active
    Driver Activation Cmd: "modprobe i915"
  Config Status: cfg=new, avail=yes, need=no, active=unknown

 

And glxinfo:

Extended renderer info (GLX_MESA_query_renderer):
    Vendor: Intel Open Source Technology Center (0x8086)
    Device: Mesa DRI Intel(R) Haswell Mobile  (0xa16)
    Version: 18.3.0
    Accelerated: yes
    Video memory: 1536MB
    Unified memory: yes
    Preferred profile: core (0x1)
    Max core profile version: 4.5
    Max compat profile version: 3.0
    Max GLES1 profile version: 1.1
    Max GLES[23] profile version: 3.1
OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) Haswell Mobile

Is there any means to deal with this problem?