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igt@kms_plane@pixel-format-pipe-[a-d]-planes(-source-clamping)? are agonizingly slow on all platforms

These tests are responsible for a significant amount of the overall reported time of a CI FULL run:

  • shard-skl: 1% (~2.5 minutes)
  • shard-kbl: 1.5% (~2 minutes)
  • shard-apl: 1.4% (~2.5 minutes)
  • shard-glk: 2% (~4.5 minutes)
  • shard-icl: 2.7% (~5.5 minutes)
  • shard-tgl: 2.3% (~4.5 minutes)

One could imagine that the bump in execution time on ICL+ is related to the increase in plane count. Regardless, all platforms need a serious speed improvement to make these tests more applicable to pre-merge testing.

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