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[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1473319

Title:
  CONFIG_DRM_I915_PRELIMINARY_HW_SUPPORT should be disabled

Status in linux package in Ubuntu:
  Triaged

Bug description:
  CONFIG_DRM_I915_PRELIMINARY_HW_SUPPORT is currently enabled, probably
  so that testing prerelease hardware is more convenient.

  But it has it's downsides too, the most important being that a release
  might ship with a kernel that has limited driver support for the new
  hardware, causing issues like the installer booting to a blank screen
  or crashing halfway through. In these cases it's best to rely on the
  fallback gfx driver so that the system can be installed and also used
  with limited functionality, until a proper (and possibly a 3rd party)
  kernel can be installed.

  This is also what upstream suggests for us to do. The setting can be
  overriden on kernel cmdline, so it allows testing said hw with
  i915.preliminary_hw_support=1.

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