Public bug reported:

Immediately after login (I enter the password and hit enter) the screen 
"crumbles" for few seconds, then all becomes normal and the system works fine. 
I have done apt update+upgrade many times, also with proposed enabled, I have 
also installed a new ISO (now i'm using the Alpha dated 20180305) but the 
problem remains. The problem happens with the x11 session but not with wayland. 
Also problem does not show with different hardware. 

corrado@corrado-p7-bb-0305:~$ inxi -Fx
System:    Host: corrado-p7-bb-0305 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: ASRock model: H110M-G/M.2 serial: N/A UEFI: 
American Megatrends v: P1.10 date: 05/11/2017
CPU:       Dual core Intel Core i3-7100 (-MT-MCP-) arch: Skylake rev.9 cache: 
3072 KB
           flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 15648
           clock speeds: max: 3900 MHz 1: 1018 MHz 2: 3150 MHz 3: 3153 MHz 4: 
3081 MHz
Graphics:  Card: Intel HD Graphics 630 bus-ID: 00:02.0
           Display Server: x11 (X.Org 1.19.6 ) driver: i915 Resolution: 
1920x1080@60.00hz
           OpenGL: renderer: Mesa DRI Intel HD Graphics 630 (Kaby Lake GT2)
           version: 4.5 Mesa 18.0.0-rc4 Direct Render: Yes
Audio:     Card Intel Sunrise Point-H HD Audio driver: snd_hda_intel bus-ID: 
00:1f.3
           Sound: Advanced Linux Sound Architecture v: k4.15.0-10-generic
Network:   Card: Intel Ethernet Connection (2) I219-V driver: e1000e v: 3.2.6-k 
bus-ID: 00:1f.6
           IF: enp0s31f6 state: up speed: 100 Mbps duplex: full mac: 
70:85:c2:44:7b:86
Drives:    HDD Total Size: 1000.2GB (1.3% used)
           ID-1: /dev/sda model: TOSHIBA_DT01ACA1 size: 1000.2GB
Partition: ID-1: / size: 32G used: 4.3G (15%) fs: ext4 dev: /dev/sda7
           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: 38.5C mobo: N/A
           Fan Speeds (in rpm): cpu: N/A
Info:      Processes: 234 Uptime: 11 min Memory: 1144.7/7680.8MB Init: systemd 
runlevel: 5 Gcc sys: N/A
           Client: Shell (bash 4.4.181) inxi: 2.3.56 
corrado@corrado-p7-bb-0305:~$

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu5
ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3
Uname: Linux 4.15.0-10-generic x86_64
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Tue Mar  6 15:47:50 2018
DistUpgraded: Fresh install
DistroCodename: bionic
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation HD Graphics 630 [8086:5912] (rev 04) (prog-if 00 [VGA 
controller])
   Subsystem: ASRock Incorporation HD Graphics 630 [1849:5912]
InstallationDate: Installed on 2018-03-05 (0 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180305)
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 003: ID 046d:c016 Logitech, Inc. Optical Wheel Mouse
 Bus 001 Device 002: ID 058f:6377 Alcor Micro Corp. AU6375 4-LUN card reader
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-10-generic.efi.signed 
root=UUID=9a36b498-59f5-4a36-81db-3046ff6bdeaa ro quiet splash
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/11/2017
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P1.10
dmi.board.name: H110M-G/M.2
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP1.10:bd05/11/2017:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnH110M-G/M.2:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: To Be Filled By O.E.M.
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.90-1
version.libgl1-mesa-dri: libgl1-mesa-dri 18.0.0~rc4-1ubuntu3
version.libgl1-mesa-glx: libgl1-mesa-glx 18.0.0~rc4-1ubuntu3
version.xserver-xorg-core: xserver-xorg-core 2:1.19.6-1ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.10.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20171229-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2

** Affects: gnome-shell (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Affects: mutter (Ubuntu)
     Importance: Undecided
         Status: Confirmed

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 bionic corruption reproducible ubuntu xorg

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https://bugs.launchpad.net/bugs/1753776

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

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