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Hi I updated my laptop(specs in the bottom) from ubuntu 19 to ubuntu 20.04 then I there were issues with the amd gpu which I fixed with replacing quiet splash with radeon.modeset=0 (My computer boots to a black screen, what options do I have to fix it?)

After getting through that; while its booting I see the ERROR message rcu_sched detected stalls on CPUs/tasks and its stuck there for about 20 minutes and not going ahead

I see the same title for other questions in askubuntu but either they older versions of ubuntu or a different hardware/GPU or there are no suggested solutions

Issue

I see the same issue when I try to boot up ubuntu 20.04 from my thumb-drive as well

My laptop Link to the product

My hardware specs

Graphics -- AMD Radeon Video MemoryInfo 2000 megabytes
Processor-- Processor Brand Intel Processor Speed (Base)Info
1.8 gigahertz
Processor ModelInfo
Intel 8th Generation Core i7
Processor Model Number
i7-8550U

MotherBoard Info

$$>wmic baseboard get product,Manufacturer,version,serialnumber
Manufacturer                   Product         SerialNumber    Version
SAMSUNG ELECTRONICS CO., LTD.  NP940X5N-X01US  123490EN400015  SGL9887A03-C01-G001-S0002+10.0.17763

wmic bios get smbiosbiosversion
SMBIOSBIOSVersion
P05AGQ.033.181123.PS


Getting SMBIOS data from sysfs.
SMBIOS 3.0.0 present.


Handle 0x0002, DMI type 2, 15 bytes
Base Board Information
    Manufacturer: SAMSUNG ELECTRONICS CO., LTD.
    Product Name: NP940X5N-X01US
    Version: SGL9887A03-C01-G001-S0002+10.0.17763
    Serial Number: 123490EN400015
    Asset Tag: No Asset Tag
    Features:
        Board is a hosting board
        Board is replaceable
    Location In Chassis: Middle
    Chassis Handle: 0x0003
    Type: Motherboard
    Contained Object Handles: 0


Handle 0x0008, DMI type 10, 10 bytes
On Board Device 1 Information
    Type: Video
    Status: Enabled
    Description: Onboard GFx
On Board Device 2 Information
    Type: Ethernet
    Status: Enabled
    Description: Onboard WLAN
On Board Device 3 Information
    Type: Other
    Status: Enabled
    Description: Onboard SATA


Handle 0x0012, DMI type 41, 11 bytes
Onboard Device
    Reference Designation:  Onboard IGD
    Type: Video
    Status: Enabled
    Type Instance: 1
    Bus Address: 0000:00:02.0
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