AMD Radeon only for ubuntu 20.04

[slamelov]

Is this a bug unique to 20.10? Or the new kernel? Previous versions did not require passing on any boot parameters for such an old card.

From what I've seen, it's a bug in 20.10 with RX580. Previous versions already have amdgpu.dc=0 and not 1.

https://bugzilla.kernel.org/show_bug.cgi?id=200695

https://www.reddit.com/r/linuxquesti...l_modesetting/

Claydoh

https://es.aliexpress.com/item/1005002181171652.html

[claydoh]

Is this a bug unique to 20.10? Or the new kernel? Previous versions did not require passing on any boot parameters for such an old card.

Probably unique to the particular GPU or mainboard, or a combination of the two. I have never have to do anything on my slightly older RX 480, which is even the same brand as yours. The bug report you linked to above is for kernels older than your 5.8, and not specific to Ubuntu.
I think it even boils down to slight revisions in the hardware, or its firmware.

I am just glad I bought my GPU last March, just before The Great GPU Shortage of 2020/21 happened. I have looked at upgrading, but even a minor upgrade to an rx580 goes
for just south of 350-400 dollars. Used.

[mr_raider]

Is this a bug unique to 20.10? Or the new kernel? Previous versions did not require passing on any boot parameters for such an old card.

[slamelov]

Thanks for all the answers.

[claydoh]

Cool beans, you found it before I could sit down and look at it

[oshunluvr]

That looks like a boot parameter. Edit /etc/default/grub and add that after "quiet splash" inside the quotes, like:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash amdgpu.cd=0"

Then save and run "sudo update-grub" then reboot

[slamelov]

Yes! Solved.

Thanks a lot.

I edited the /etc/default/grub file and added:

GRUB_CMDLINE_LINUX="amdgpu.dc=0"

[slamelov]

I think that I have found the solution:

https://bugzilla.kernel.org/show_bug.cgi?id=200695

But I don't know how to set this value:

amdgpu.dc=0

[slamelov]

May be not for this kernel...

Remember I had to enter in recovery mode:

lspci -nnk | grep -i vga -A3

04:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] [1002:67df] (rev e7)
      Subsystem: XFX Pine Group Inc. Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] [1682:c580]
      Kernel modules: amdgpu
04:00.1 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere HDMI Audio [Radeon RX 470/480 / 570/580/590] [1002:aaf0]

sudo dmesg | grep amd

[    1.536797] [drm:amdgpu_init [amdgpu]] *ERROR* VGACON disables amdgpu kernel modesetting.

Thanks!

[claydoh]

Again, your video card is fully supported and fully performant in Linux without any extra driver to install.

There is something wrong on your system, but determining what it is may take some work.

The OS install could be borked
The mainboard may be mis-configured
Or the mainboard may need some kernel parameter added to grub
May need to disable secure boot (if it is enabled)


So lets get info about the video card an what driver it is actually using:

[FONT=monospace][COLOR=#000000]lspci -nnk | grep -i vga -A3[/COLOR][/FONT]

here is mine:

[FONT=monospace][COLOR=#54ff54][B]claydoh@hp[/B][/COLOR][COLOR=#000000]:[/COLOR][COLOR=#5454ff][B]~[/B][/COLOR][COLOR=#000000]$ lspci -nnk | grep -i vga -A3 [/COLOR]
01:00.0 [COLOR=#ff5454][B]VGA[/B][/COLOR][COLOR=#000000] compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480/570/5[/COLOR]
70X/580/580X/590] [1002:67df] (rev c7) 
Subsystem: XFX Pine Group Inc. Radeon RX 480 [1682:9480] 
Kernel driver in use: amdgpu 
Kernel modules: amdgpu
[/FONT]

My rx480 here is the exact same graphics chip as an RX 580, the 580 just has a small bump in clock speeds.



Also, we can look for any log messages relating to the stock amdgpu driver, maybe showing error messages:

dmesg | grep amd

[Don B. Cilly]

Or try KDE neon, which is "conservative" in terms of kernels - and apps - . and "ahead" in terms of Plasma.
Otherwise it's pretty much the same as Kubuntu.

[slamelov]

Nothing wrong, I simply installed the latest version that was available on kubuntu.org . I may have to install 20.04 or wait for AMD support.

[Don B. Cilly]

If I may ask... why 20.10? What's wrong with 20.04? It's LTS and all...

[Snowhog]

From what I'm finding on the 'Net, AMD doesn't have support for the Radeon RX 580 beyond Ubuntu 20.04 (yet), and that would imply that the Kernel for 20.10 doesn't have a suitable driver for this GPU either.

[slamelov]

These boards are also sold on amazon, they are reliable, judging by the information that can be found on the internet.

Here the problem is with Kubuntu, something happens with some parameter that prevents booting in normal graphical mode. It doesn't happen to me with other Linux distributions.

I could install another distro, or Windows, but I wanted to use Kubuntu, I really like this distro.