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[Bug 1503548] Re: [i915_bpo] Sync to v4.2.2


the hang was due to

introduced in -31.35, fixed in -31.36. I'll build another test kernel.

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  [i915_bpo] Sync to v4.2.2

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Vivid:
  In Progress

Bug description:
  There are a few bugfixes upstream that our backport lacks:

   drm/i915: Fix CSR MMIO address check
   drm/i915: Limit the number of loops for reading a split 64bit register
   drm/i915: Always mark the object as dirty when used by the GPU
   drm/i915: Allow DSI dual link to be configured on any pipe
   drm/i915: Preserve SSC earlier
   drm/i915: Check DP link status on long hpd too

  the bottom one fixes one OEM bug which also got a BIOS workaround, but
  a code fix would be in order for other platforms.

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