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[Bug 1595803] Re: [i915_bpo][SKL] Display core init/uninit updates


I experienced the bug with the following kernel:
Linux XPS-13-9350 3.19.0-64-generic #72~14.04.1-Ubuntu SMP Fri Jun 24 17:59:48 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

I downloaded all the deb files from your link and tried to install them, see http://paste.ubuntu.com/18442758/ but linux-tools failed. I did not understand why and rebooted anyway to try. After rebooting I think I still had the old kernel and standby got more broken. Closing the lid and then opening it did not switch the screen back on and I had to use the power button to switch the laptop off and on.

It seems like the package manager could resolve these issues, see

After that I tested with the new kernel
Linux XPS-13-9350 3.19.0-64-generic #72 SMP Thu Jun 30 18:23:54 CST 2016 x86_64 x86_64 x86_64 GNU/Linux
and I closed/opened the lid a few (4) times. The sound still works fine, but at least once the mouse pointer disappeared for me. I could still use the touchpad to move the cursor and click things, but the cursor was invisible so I did not know where the cursor was located.

I will test more to see if that happens more often.

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  [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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