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Kaapiii/fix-vgacon-disable-amdgpu.md

Created April 16, 2020 13:58
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Ubuntu 19.10 and Ubuntu 20.04 (beta) - "Unknown display" / Unable to detect multiple displays with Radeon rx570 gpu
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fix-vgacon-disable-amdgpu.md

Ubuntu is not able to detect multipble displays when using an gpu from AMD. Error "VGACON disables amdgpu ..."

When searching for graphics card with "sudo lshw -c video" on Ubuntu 19.10 or 20.04 (beta) the following error is shown:

# list graphics/video cards
sudo lshw -c video
#[drm:amdgpu_init [amdgpu]] *ERROR* VGACON disables amdgpu kernel mode setting.

Grup setting on my system "nomodeset" prevented the graphics card driver from loading properly. Ubuntu 19.10 and also 20.04 (beta) was not able to detect multiple displays.

By removing the value from grup, and rebooting the client the issue was gone.

sudo vim /etc/default/grub

# remove "nomodeset" and safe the file
#GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset"

sudo update-grup
sudo reboot
@shanduur
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Should be update-grub instead update-grup.

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