Whenever I launch Ubuntu my screen of PC starts flashing continuously

Question

Hi I just installed Ubuntu 20.04 on my HP desktop PC and it’s dual boot with windows 10. Windows 10 runs fine but whenever I launch Ubuntu my screen of PC starts flashing continuously and it’s very difficult to use I can still use it but it’s really difficult plz help.

My system info : PC : hp desktop
                 Processor : Intel petinum(R) GPU G620 @2.60GHz x 2
                 Graphics : Intel HD Graphics 2000 (SNB GT1)
                 OS name : Ubuntu 20.04 LTS
                 OS type : 64-bit
                 GNOME Version : 3.36.2
                 Windowing System : X11
                 Memory : 3.8 GiB
                 Disk space : 1.0 TB

Video on the error while using live usb same happens using normal installation

Go to Settings, Displays, and try and select a different resolution for the display. Also, show me sudo dmidecode -s bios-version and tell me the exact model # of your computer. — heynnema, Jun 14 '20 at 17:50
Yea thanks for that but I’m trying to install a older version and I deleted the previous one if it does not resolve I will surely send — Madhav Garg, Jun 14 '20 at 17:51
If you send me the BIOS version, and the model #, I can at least check if there's a newer version available for you. — heynnema, Jun 14 '20 at 18:55
Hey I tried the thing after entering the code gives : LEO_702 — Madhav Garg, Jun 15 '20 at 10:06
And my PC product name is 120-1020in do o also give my serial number? — Madhav Garg, Jun 15 '20 at 10:09
To be clear you haven't just installed Ubuntu but are booting the Live USB? — WinEunuuchs2Unix, Jun 15 '20 at 10:43
??? What do you mean? I installed it before then I deleted it and installed a older version on my drive buti have not installed it fully because I want it to be fixed first I’m not a doofus — Madhav Garg, Jun 15 '20 at 12:18
I couldn't find anything about BIOS updates at support.hp.com for your HP Omni 120-1020in. Do you have Windows installed? Is there an app called HP Support Assistant, or similar there? — heynnema, Jun 15 '20 at 14:03

score 1 · Answer 1 · answered Jun 14 '20 at 20:13

From this Bug Report (You should read the entire bug report from start to finish):

Intel 8550U with 620UHD GPU screen flashing

This solution:

Add kernel parameter: drm.debug=0x1e log_buf_len=4M

To add a kernel parameter use sudo -H gedit /etc/default/grub and locate the line:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

change it to:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash drm.debug=0x1e log_buf_len=4M"

Save the file and exit gedit then run

sudo update-grub

Now reboot and see if the flickering is gone.

In my own /etc/default/grub file I keep random notes I've collected over the years about kernel parameters. I've extracted these old notes that may help you:

# i915.enable_rc6=0 Fix screen flickering Kernel's > 4.12 https://bbs.archlinux.org/viewtopic.php?id=211399

# i915.enable_psr=0 screen flickering kernel's > 4.6 https://wiki.archlinux.org/index.php/intel_graphics#Skylake_support

Okk I hope this will work thank you for typing so long stuff — Madhav Garg, Jun 14 '20 at 20:24
@MadhavGarg I hope it works too. Let me know how it works out after you try it. — WinEunuuchs2Unix, Jun 14 '20 at 20:26

Whenever I launch Ubuntu my screen of PC starts flashing continuously

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