problem does NOT occur with Gnome 3.27.92 and a different Intel graphics:
mao@mao-p6-bb:~$ inxi -Fx
System:    Host: mao-p6-bb Kernel: 4.15.0-10-generic x86_64 bits: 64 gcc: 7.3.0
           Desktop: Gnome 3.27.92 (Gtk 3.22.28-1ubuntu3)
           Distro: Ubuntu Bionic Beaver (development branch)
Machine:   Device: desktop Mobo: Gigabyte model: H87M-D3H v: x.x serial: N/A
           UEFI: American Megatrends v: F3 date: 04/24/2013
CPU:       Dual core Intel Core i3-4130 (-MT-MCP-) arch: Haswell rev.3 cache: 
3072 KB
           flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 13569
           clock speeds: max: 3400 MHz 1: 915 MHz 2: 1260 MHz 3: 1224 MHz 4: 
1259 MHz
Graphics:  Card: Intel 4th Generation Core Integrated Graphics Controller 
bus-ID: 00:02.0
           Display Server: x11 (X.Org 1.19.6 ) driver: i915 Resolution: 
           OpenGL: renderer: Mesa DRI Intel Haswell
           version: 4.5 Mesa 18.0.0-rc4 Direct Render: Yes
Audio:     Card-1 Intel 8 Series/C220 Series High Def. Audio Controller
           driver: snd_hda_intel bus-ID: 00:1b.0
           Card-2 Intel Xeon E3-1200 v3/4th Gen Core Processor HD Audio 
           driver: snd_hda_intel bus-ID: 00:03.0
           Sound: Advanced Linux Sound Architecture v: k4.15.0-10-generic
Network:   Card: Realtek RTL8111/8168/8411 PCIE Gigabit Ethernet Controller
           driver: r8169 v: 2.3LK-NAPI port: e000 bus-ID: 02:00.0
           IF: enp2s0 state: up speed: 100 Mbps duplex: full mac: 
Drives:    HDD Total Size: 1000.2GB (1.2% used)
           ID-1: /dev/sda model: ST1000DM003 size: 1000.2GB
Partition: ID-1: / size: 32G used: 4.0G (14%) fs: ext4 dev: /dev/sda6
           ID-2: swap-1 size: 8.59GB used: 0.00GB (0%) fs: swap dev: /dev/sda2
RAID:      No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors:   System Temperatures: cpu: 29.8C mobo: 27.8C
           Fan Speeds (in rpm): cpu: N/A
Info:      Processes: 237 Uptime: 7 min Memory: 1431.8/7856.5MB
           Init: systemd runlevel: 5 Gcc sys: N/A Client: Shell (bash 4.4.181) 
inxi: 2.3.56

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  After login the screen pixelates for few seconds on GNOME on X

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