Display – Fix Flickering in Chrome/Chromium on Zenbook UX303UA

Situation: the display of Zenbook UX303UA is flickering almost like here, but I do not get it in Youtube, only when resolving the new Google Plus website's community section (green one) in Chromium 51.x and Google Chrome 52.x but not in Firefox; and Ubuntu's documentation of Zenbooks does not mention the problem but it is hardware-specific (Intel), and internet-site specific because I can reproduce it only with Google Plus' website about communities.
Resolution options

1. Doing sudo apt-get purge xserver-xorg-video-intel deletes the bug origin (xserver-...-intel) and expresses the package modesetting which is used by Ubuntu when no other option. No such a problem here. Without the package, however, you cannot do fixes of brightness adjustments with the file /usr/share/X11/xorg.conf.d/20-intel.conf for F5/F6 (here).

2. Joakim's 4th proposal seems to work in /usr/share/X11/xorg.conf.d/20-intel.conf and install then back again intel drivers by sudo apt-get install xserver-xorg-video-intel. This proposal works with the brightness adjustments of F5/F6 but complicates in Matlab here. Here we do not understand why it works, maybe some conflict is disabling the bug, particularly associated with intel_backlight

   # Joakim
   Section "Device"
      Identifier "Intel Graphics"
      Driver "intel"
      Option "AccelMethod" "sna"
      Option "TearFree" "true"
      Option "DRI" "3"
      Option "Backlight" "intel_backlight"
   EndSection
   

Best option is (2) by including all features (no flickering and adjustment possibility with 20-intel.conf for F5/F6 about brightness, …
However, we do not understand why (2) works.
Characteristics

• xdpyinfo|grep resolution returns resolution: 96x96 dots per inch so the pixel size is good for Xorg-server (here)

• lspci -k | grep -EA2 'VGA|3D' gives

  00:02.0 VGA compatible controller: Intel Corporation Sky Lake Integrated Graphics (rev 07)
      Subsystem: ASUSTeK Computer Inc. Skylake Integrated Graphics
      Kernel driver in use: i915_bpo
  

• I updated to Linux kernel 4.7 by wgetting generic packages of amd64 and headers (3 files) here. Output: the amount of flickering maybe decreased but still some flickering every 10-15 seconds.

• Internet browser specific in Chromium 51.x and Google Chrome 52.x because the problem does not reproduce in Firefox.

• Hardware-specific (Intel).
• Internet site specific because I can reproduce it only with the new Google Plus of Communities in Zenbook. I cannot reproduce it in Youtube, like in the other bug report of Ubuntu listed below.

Unsuccessful Resolution attempts

• Ticket in Chromium Ticket Tracker here with the issue number 640932.

• Joakim's answer unsuccessful. My /usr/share/X11/xorg.conf.d/20-intel.conf. Blinking/flickering stays the same after the reboot.

  # https://askubuntu.com/a/816703/25388
  Section "Device"
     Identifier "Intel Graphics"
     Driver "intel"
     Option "AccelMethod" "sna"
     Option "TearFree" "true"
     Option "DRI" "3"
  EndSection
  

• Joakim's second proposal unsuccesful. Relevant part of my /usr/share/X11/xorg.conf.d/20-intel.conf. Blinking/flickering stays the same after the reboot. I did not purge the proposel intel package.

  # https://askubuntu.com/a/816703/25388
  Section "Device"
          Identifier "card0"
          Driver "intel"
          Option "AccelMethod" "sna"
          Option "TearFree" "true"
          Option "DRI" "3"
          Option "Backlight" "intel_backlight"
          BusID "PCI:0:2:0"
   EndSection
  

Hardware: Asus Zenbook UX303UA R4028T
System: Ubuntu 16.04 64 bit
GPU: Intel integrated
Linux kernel: 4.4, 4.7.0-040700-generic
Internet browsers: Chromium 51.0.2704.79 64 bit, Google Chrome 52.0.2743.116 64-bit
Test site: the new version of Google Plus etc in any communities (green version)
Related bugs in Ubuntu: Major screen flickering in Chromium and Google Chrome
Hardware's Documentation: Ubuntu's AsusZenbook