7

I built a new computer and am now getting weird graphics glitches when browsing the web or streaming video in a browser.

https://i.imgur.com/hJJm5aY.png

https://i.imgur.com/X74isqn.png

https://i.imgur.com/2ka12zm.mp4 (this one isn't mine, but similar to what is happening to me)

My setup:

Ryzen 5 3400G processor with integrated graphics

Gigabyte B450M DS3H motherboard (BIOS is updated with latest firmware), 16GB (2x8GB) DDR4 3200

Connected to Samsung Q70R QLED Smart 4K TV (old computer and HDMI cable worked fine with this TV)

I have tried many of the fixes that I found searching online, but none of them seem to completely fix the problem. I have tried fresh installs of the latest Ubuntu 18.04 and 20.04 versions. I have tried a couple methods of updating or changing the kernel versions. Changing resolutions, refresh rates, or scaling does not fix the issue.

Current configuration after fresh 20.04 install:

lsb_release -a

Distributor ID: Ubuntu
Description:    Ubuntu 20.04 LTS
Release:    20.04
Codename:   focal

uname -a

Linux media-server 5.4.0-29-generic #33-Ubuntu SMP Wed Apr 29 14:32:27 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

lspci | grep VGA

07:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Picasso (rev c8)

sudo lshw -c video

*-display                 
       description: VGA compatible controller
       product: Picasso
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]
       physical id: 0
       bus info: pci@0000:07:00.0
       version: c8
       width: 64 bits
       clock: 33MHz
       capabilities: pm pciexpress msi msix vga_controller bus_master cap_list rom
       configuration: driver=amdgpu latency=0
       resources: irq:101 memory:e0000000-efffffff memory:f0000000-f01fffff ioport:e000(size=256) memory:fcb00000-fcb7ffff memory:c0000-dffff
James
  • 186

3 Answers3

6

Same problems can be observed with Ubuntu 20.04 LTS / Ryzen 3 3200G / Gigabyte B450M S2H / 16GB (2x8GB) DDR4 3200.

Workaround 1:

Disable IOMMU in BIOS.

Workaround 2:

Add iommu=pt to command line in /etc/default/grub following the steps below.

  1. Run

    sudo nano /etc/default/grub

  2. Make the GRUB_CMDLINE_LINUX_DEFAULT line look like this

    GRUB_CMDLINE_LINUX_DEFAULT="quiet splash iommu=pt"

  3. Update grub by

    sudo update-grub

  4. Reboot with

    sudo reboot
Community
  • 1
panariga
  • 156
2

Is there a third workaround ?

The prompt is displayed ok (same picture on both screen) Then my display is sliced horizontally Each slice is shifted

I disabled IOMMU in the bios, changed the grub conf Activated dual screen in bios too.

HDMI monitor on HDMI (full hd) VGA monitor on HDMI>VGA on a DP>HDMI passive adapter (1650x ???) This is not a hardware issue or bios setting issue as I have dual screen working

Fresh ubuntu 20.04 install with kernel 5.4

Found a 3rd workaround with this video https://www.youtube.com/watch?v=WWg8q_f7nI4

Jerome_B
  • 151
2

I'm currently using Ubuntu 20.10

While support for these devices has been in the kernel for a while, I've found I've had missing firmware when I see an update-initramfs. I also saw some AMDGPU-specific commits to upstream linux-firmware a little while ago, and tried the latest available deb package for Hirsute - it fixed all of my weird issues with the system, including requiring software IOMMU

YMMV, but try the 1.191 deb package under https://launchpad.net/ubuntu/+source/linux-firmware

Edit: step by step instructions as requested!

  1. Navigate to https://launchpad.net/ubuntu/+source/linux-firmware
  2. Expand the 1.191 arrow, under The Hirsute Hippo branch
  3. Download linux-firmware_1.191_all.deb
  4. Install the new firmware
    sudo apt install /path/to/linux-firmware_1.191_all.deb
  5. Reboot

Edit2: For reference, I have two AMD systems this really helped with. One is a Dell Inspiron 5585 w/ AMD Ryzen 3500U, the other is one I built with an AMD Ryzen 3400G.

Lyndon
  • 21