Hi!
Ubuntu Version:
Kubuntu 25.04 and
Ubuntu Studio 24.04.3 LTS
Desktop Environment (if applicable):
Plasma Desktop (by KDE)
Problem Description:
I tried out Kubuntu and Ubuntu Studio from a Live-Stick and freshly installed. With the official .iso from the website, sha256 checked. When my dGPU (AMD Radeon X580) was plugged in and I booted normally I always had problems, the screen was a bright mess. With the dGPU inside I had to either use safe graphics mode for the live environment or “nomodeset” in GRUB for the installed version. With “nomodeset” the screen resolution is very low (1024x768) and cannot be changed.
If I unplugged the dGPU and used the iGPU (Intel), everything was fine. But not using the dGPU is not the long term solution I’m looking for.
I’m sure the dGPU is not defect, as it worked just fine yesterday, when I had Fedora installed. It also worked normal with Windows 10 and Linux Mint before.
Relevant System Information:
This is with the dGPU unplugged:
cat /var/log/gpu-manager.log
log_file: /var/log/gpu-manager.log
last_boot_file: /var/lib/ubuntu-drivers-common/last_gfx_boot
new_boot_file: /var/lib/ubuntu-drivers-common/last_gfx_boot
can't access /run/u-d-c-nvidia-was-loaded file
can't access /opt/amdgpu-pro/bin/amdgpu-pro-px
Looking for nvidia modules in /lib/modules/6.14.0-32-generic/kernel
Looking for nvidia modules in /lib/modules/6.14.0-32-generic/updates/dkms
Looking for amdgpu modules in /lib/modules/6.14.0-32-generic/kernel
Looking for amdgpu modules in /lib/modules/6.14.0-32-generic/updates/dkms
Is nvidia loaded? no
Was nvidia unloaded? no
Is nvidia blacklisted? no
Is intel loaded? yes
Is radeon loaded? no
Is radeon blacklisted? no
Is amdgpu loaded? no
Is amdgpu blacklisted? no
Is amdgpu versioned? no
Is amdgpu pro stack? no
Is nouveau loaded? no
Is nouveau blacklisted? no
Is nvidia kernel module available? no
Is amdgpu kernel module available? no
Vendor/Device Id: 8086:412
BusID "PCI:0@0:2:0"
Is boot vga? yes
Skipping "/dev/dri/card1", driven by "i915"
Skipping "/dev/dri/card1", driven by "i915"
Skipping "/dev/dri/card1", driven by "i915"
Found "/dev/dri/card1", driven by "i915"
output 0:
card1-HDMI-A-1
Number of connected outputs for /dev/dri/card1: 1
can't access /etc/prime-discrete
No prime-settings found. Assuming prime is not set to ON (ONDEMAND could be on).
Does it require offloading? no
last cards number = 1
Has amd? no
Has intel? yes
Has nvidia? no
How many cards? 1
Has the system changed? No
Single card detected
Nothing to do
Is amdgpu kernel module available? no
This seems strange to me, as to my knowledge, it should be part of the kernel and available. But maybe that’s because there is no AMD hardware in the computer at the moment.
What I’ve Tried:
Anything I could find, honestly.
apt-get update & upgrade
I tried looking for driver.deb packages, found some, installed them, but it did not help.
I looked if the driver is blacklisted, it was not.
I added some entries to GRUB, e.g.
GRUB_CMDLINE_LINUX_DEFAULT="amdgpu.cik_support=1 amdgpu.dc=1"
or
“nomodeset”
It did not help.
Edit: I researched what those additions even do. amdgpu.cik_support=1 refers to Caribbean Islands GPUs, so the Radeon 300 series. For Sea Islands GPUs (Radeon 200 series) it would be amdgpu.si_support=1. Both aren’t what I have, my card is from the 500 series, Polaris, which does not need a kernel parameter. So, no wonder it didn’t work.
Does anyone have any more ideas?