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I successfully installed Bionic Beaver, working around the KMS problem with "nomodeset" appended to the GRUB2 options when installing. However, or perhaps as a consequence, Ubuntu installed the graphics system as this, without 3D acceleration: glxinfo | grep OpenGL gives:

OpenGL renderer string: llvmpipe (LLVM 6.0, 128 bits)

Whereas lspci | grep -E 'VGA|Display' gives:

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RV730/M96-XT [Mobility Radeon HD 4670]

...which according to other info available here is well supported by the "radeon" driver built into the kernel.

If I look in the Gnome system for additional drivers it says "no additional drivers available", which is fine, since the kernel should handle this anyway. But how do I switch to the "radeon" driver? Of course I should not fall back into the black screen problem caused by unspported KMS...

Some articles address parts of this problem, but most are too different, addressing issues in Unity and older versions of Ubuntu.

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  • A suggestion in this forum that works for Ubuntu 14.04 also makes the boot process smoother in my case for 18.04. However, the driver in use is still llvmpipe... how can I change to the "radeon" driver?
    – Molemi
    Jun 22, 2018 at 10:07
  • So where is the best way to force Ubuntu 18.04 into the "radeon" driver: in grub2, in xorg.conf or in gnome? I cannot find any meaningful xorg.conf file in 18.04. Where does gnome get this information?
    – Molemi
    Jun 22, 2018 at 12:34

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