*** This bug is a duplicate of bug 1751414 ***
    https://bugs.launchpad.net/bugs/1751414

I'm facing huge difficulties after this upgrade. All games I'm running
with wine stopped working. I did not test others. They start, but I
either get a black or purple window, no image. Can somebody point me the
right way to debug and solve this?

I have an AMD Radeon HD 7850 installed.

Making a basic test, it seems to perform better with software
rendering... ?!?

$ glxgears -info
GL_RENDERER   = AMD PITCAIRN (DRM 2.50.0 / 4.15.0-11-generic, LLVM 5.0.1)
GL_VERSION    = 3.0 Mesa 18.0.0-rc4
GL_VENDOR     = X.Org
(...)
VisualID 1064, 0x428
355 frames in 5.0 seconds = 70.940 FPS
300 frames in 5.0 seconds = 59.997 FPS

$ LIBGL_ALWAYS_SOFTWARE=1 glxgears -info
GL_RENDERER   = llvmpipe (LLVM 5.0, 128 bits)
GL_VERSION    = 3.0 Mesa 18.0.0-rc4
GL_VENDOR     = VMware, Inc.
(...)
VisualID 1064, 0x428
6604 frames in 5.0 seconds = 1320.753 FPS
6758 frames in 5.0 seconds = 1351.475 FPS

Further details:
$ lspci -nn | grep -E 'VGA|Display'
01:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. 
[AMD/ATI] Pitcairn PRO [Radeon HD 7850 / R7 265 / R9 270 1024SP] [1002:6819]

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https://bugs.launchpad.net/bugs/1752938

Title:
  Upgrading Ubuntu 18.04 disables GPU hardware acceleration

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