[Bug 1910861] [NEW] Screen Keeps Blinking/Flickering after waking up from lock

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Description: Ubuntu 20.04.1 LTS
Release: 20.04

What you expected to happen?
After waking up from lock it should show the enter password screen and then after entering password it should show desktop

What happened instead?
After waking up the machine from lock , its starts flickering/blinking with black backlight for some times (from 20 seconds to 5 mins) and then shows enter password screen to login.

Following is my hardware information along with a short video what
happens

Hardware Information :
System: Kernel: 5.8.0-36-generic x86_64 bits: 64 compiler: N/A Desktop: Gnome 3.36.3
           Distro: Ubuntu 20.04.1 LTS (Focal Fossa)
Machine: Type: Laptop System: Dell product: Vostro 15-3568 v: N/A serial: <filter>
           Mobo: Dell model: 01Y1RD v: A00 serial: <filter> UEFI: Dell v: 01.08.00 date: 03/23/2017

CPU: Topology: Dual Core model: Intel Core i5-7200U bits: 64 type: MT MCP arch: Amber Lake rev: 9 L2 cache: 3072 KiB
           flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 21599
           Speed: 800 MHz min/max: 400/3100 MHz Core speeds (MHz): 1: 802 2: 800 3: 800 4: 800
Graphics: Device-1: Intel HD Graphics 620 vendor: Dell driver: i915 v: kernel bus ID: 00:02.0
           Display: wayland server: X.Org 1.20.8 driver: i915 resolution: 1366x768~48Hz
           OpenGL: renderer: Mesa Intel HD Graphics 620 (KBL GT2) v: 4.6 Mesa 20.0.8 direct render: Yes

Video Link : hhttps://youtu.be/XPfYNbduPig

** Affects: linux (Ubuntu)
Importance: Undecided
Status: New


** Tags: ubuntu20.04 unity
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Screen Keeps Blinking/Flickering after waking up from lock
https://bugs.launchpad.net/bugs/1910861
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