Ubuntu
xserver-xorg-video-amdgpu package

  1. Bug #1888088
  2. Comment #6

Comment 6 for bug 1888088

Revision history for this message
John Gilmore (gnu-gilmore) wrote : Re: [amdgpu] [Lenovo IdeaPad Flex 5 14ARE05] Display won't rotate, nor do fractional scaling

I found a way to enable the amdgpu support for this hardware in the standard LTS kernel! Based on this comment on a YouTube video reviewing this laptop:

  https://www.youtube.com/watch?v=FjegdWtHuOE&lc=UgzbtkQw4vuk6ls-6vF4AaABAg

Add "amdgpu.exp_hw_support=1" to the kernel command line in /etc/default/grub, run
update-grub, and reboot. This FIXES ALL THE ISSUES that I encountered in this bug. I am running linux-image-5.4.0-42-generic:amd64 (5.4.0-42.46) which is the current LTS kernel.

The same poster also recommended turning on this Firefox about:config setting, to avoid screen tearing while playing YouTube videos: layers.acceleration.force-enabled.

I have seen reports (comments below that same YouTube video, and elsewhere) that there are small kernel patches in the 5.7 kernels that also fix the screen brightness settings on this hardware. Perhaps a future Ubuntu kernel update can cherry-pick those fixes, and automatically enable the experimental hardware support for this integrated AMD Ryzen 5 4500U CPU/GPU? Would be good for these fixes to get into the Ubuntu 20.04.1 point release, too; these laptops are very fast and cost $600 so they are selling very well.