I'm new to Ubuntu. I just bought a new PC for my son and we want to dual-boot Windows 10 and Ubuntu 20.04.

The PC has an Athlon 3000G with a MSI B450 and a m.2 SSD.

When I log in to Ubuntu, there is a problem with the desktop. I also can't seem to get amdgpu-pro from AMD's page, so I'm a bit lost.

It is almost impossible to navigate on the Ubuntu desktop due to the graphics issue.

I have also tried change the screen resolution with xrandr -s 800x600 but this did not solve the problem, and might have made it worse: The native resolution for the screen is 1440x900.

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2 Answers

My previous answer prevents the amdgpu driver to load .
On my Lenovo Ideapad L340-17API , it freeze desktop after a few minutes.
Correct answer is from Failed to put a second screen Xubuntu 20.04 and ArchWiki: Ryzen

• Edit again grub.conf to remove previously added "nomodeset" parameter, then run sudo update-grub
• Edit /usr/share/X11/xorg.conf.d/xx-amdgpu.conf
• Add the line Option "TearFree" "true" just before the last line:

Section "Device" Identifier "AMD" Driver "amdgpu" Option "TearFree" "true"
EndSection

Save and reboot.

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I recently had the same problem with Xubuntu 20.04 on a Lenovo Ideapad L340-17API, which have AMD gpu.

You need to set "nomodeset" parameter at boot , as described here:
Edit /etc/default/grub :
sudo nano /etc/default/grub

Add "nomodeset" to line GRUB_CMDLINE_LINUX_DEFAULT . This line becomes :
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset"
Save by hitting Ctrl+O, then exit nano with Ctrl+X, then run:
sudo update-grub
Reboot

(Not related, but the desktop had random freeze , so i had to revert to Xubuntu 18.04 . The amdgpu driver is installed but not loaded in 20.04, I guess its the problem )

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