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First of all, I'm new to the Linux world with graphical UIs and I only have some experience in using "headless" terminal only unix varieties.

I'm unsuccessfully trying to run an older intel i5-750 computer with an AMD Radeon HD 7870 XT Tahiti PCIE graphics card.

I installed a fresh copy of Ubuntu 20.04 LTS with kernel

anni@APOLLON:~$ uname -a
Linux APOLLON 5.8.0-53-generic #60~20.04.1-Ubuntu SMP Thu May 6 09:52:46 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

and on bootup of the computer, after seeing the ubuntu boot logo the screen just shows this weird pattern as shown in the photo below

Weird garbled pattern on bootup

I tested all of the video cards outputs, HDMI, DVI, DisplayPort 1, DisplayPort 2 with the same results.

I'm currently running ubuntu in recovery mode without any loaded video drivers without any other problems. The output of lspci is

anni@APOLLON:~$ lspci
...
07:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Tahiti LE [Radeon HD 7870 XT]
...

The hardware is OK as it is running perfectly fine under Windows 10 so it must be a driver/configuration issue I cannot fathom.

Does anybody have any clues on what to do to get opengl/mesa grahpics acceleration working? I want to use the computer for some custom accelerated 3D visualization work.

1 Answer 1

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Try kernel parameters "nomodeset" or "radeon.modeset=0"

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    Welcome to the site, and thank you for your contribution. Currently, your post looks like a comment rather than a complete answer. Please edit your post to include an explanation on why you think this solves the OPs problem, and how you came to the conclusion what the OPs problem is.
    – AdminBee
    Jun 23, 2021 at 14:19

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