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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

Madhav Garg
  • 21

1 Answers1

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

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

WinEunuuchs2Unix
  • 105,762