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[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

Fix released in 3.19.0-47.53

** Changed in: linux (Ubuntu Vivid)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1526220

Title:
  [SKL] Disable display power well

Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Vivid:
  Fix Released
Status in linux source package in Wily:
  Triaged

Bug description:
  Display power well can cause issues like blank screen when logging in
  after resume from suspend, so it's best to disable it for now like
  upstream did in v4.4-rc1:

  commit 1b0e3a049efe471c399674fd954500ce97438d30
  Author: Imre Deak <imre.deak@xxxxxxxxx>
  Date:   Thu Nov 5 23:04:11 2015 +0200

      drm/i915/skl: disable display side power well support for now
      
      The display power well support on this platform is in a somewhat broken
      state atm, so disable it by default.
      
      This in effect will get rid of incorrect assert WARNs about the CSR/DMC
      firmware not being loaded during power well toggling. It also removes a
      problem during driver loading where a register is accessed while its
      backing power well is down, resulting in another WARN. Until we come up
      with the root cause of the second problem and the proper fix for both
      issues, keep all display side power wells on.
      
      Also clarify a bit the option description.
      
      Reported-by: Dave Airlie <airlied@xxxxxxxxxx>
      Reference: http://mid.gmane.org/CAPM=9tyjBQjSBTKa49cRr6SYkpNW7Pq-fUFznZZ8Y1snvvk7mA@xxxxxxxxxxxxxx
      Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
      Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
      Link: http://patchwork.freedesktop.org/patch/msgid/1446757451-2777-1-git-send-email-imre.deak@xxxxxxxxx
      Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>

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