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[Tim Peeters <1595803@xxxxxxxxxxxxxxxxxx>]

I found this bug via a link in http://en.community.dell.com/techcenter
/os-applications/f/4613/t/19682246?pi22229=2

If it is the same bug, then I am experiencing it on trusty with kernel
3.19.0-61-generic #69~14.04.1-Ubuntu SMP Thu Jun 9 09:09:13 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux so it would need to be fixed there too.

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https://bugs.launchpad.net/bugs/1595803

Title:
  [i915_bpo][SKL] Display core init/uninit updates

Status in linux package in Ubuntu:
  In Progress

Bug description:
  At the moment, our i915_bpo driver on Vivid (kernel version:
  Ubuntu-3.19.0-62.70) lacks certain patches which fix the display core
  init/uninit sequence esp. handling dmc firmware loading and runtime-
  pm. Following patches from v4.5-rc1 address these issues on SKL.

  * e8ca932 drm/i915: Extract a intel_power_well_enable() function
  * dcddab3 drm/i915: Extract a intel_power_well_disable() function
  * 0a9d2be drm/i915/skl: Making DC6 entry is the last call in suspend flow.
  * 18a04a7 drm/i915: Kill intel_runtime_pm_disable()
  * ebae38d drm/i915/gen9: csr_init after runtime pm enable
  * 01a6908 drm/i915: use correct power domain for csr loading
  * bffbcd9 drm/i915/gen9: Don't try to load garbage dmc firmware on resume
  * ca1283d drm/i915/skl: Removed assert for csr-fw-loading check during disabling dc6
  * 56fcfd6 drm/i915: fix the power well ID for always on wells
  * fc17f22 drm/i915: fix lookup_power_well for power wells without any domain
  * 2f693e2 drm/i915: Make turning on/off PW1 and Misc I/O part of the init/fini sequences

  These patches also fix OEM bug related to audio not working after
  suspend by close/open lid.

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