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[Bug 1568211] Re: no UMS support in radeon module


I have a computer with AMD A8-6600K APU processor with a module Radeon
HD Graphics (HD 8570D)

Booting a  new Ubuntu 16.04 from a LiveDVD the monitor receives no
signal and apparently nothing happens, except the running of the DVD-

However, booting with the option Nomodeset is successful, only a message
shows up that no UMS support is present in the Radeon module.

I am not sure this IS a bug, reading http://www.phoronix.com/scan.php?page=news_item&px=MTI2ODA
(if I am not expected to provide links, please excuse me)

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  no UMS support in radeon module

Status in linux package in Ubuntu:

Bug description:
  I upgraded overnight from Wily to Xenial. The system will not boot.
  Only a blank screen after grub loads the kernel.

  The recovery kernel loads fine and I was able to find the following

  [drm] VGACON disable radeon kernel modesetting
  [drm:radeon_init [radeon]] *ERROR* no UMS support in radeon module!

  The recovery kernel command line had a nomodeset parameter that was
  not in the main kernel command line.

  Adding the nomodeset parameter the main kernel command line finally
  booted the system. It's kind of ugly but it seems to work.

  Note: For what it's worth I reported a similar issue against several
  Utopic kernels (bug #1407505). There was a back and forth with
  jsalisbury until a kernel finally worked. I have had no problems until

  Hope that helps.

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