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[TGL-H] Noise/color screen pops up before login to Linux (after grub)

On TGL-H platform, noise/color screen pops up before login to Linux (after grub).

Isolation:

  • "intel_iommu=igfx_off" would workaround this issue.
  • Only reproduce under enbabling secure-boot.
  • Intel drm-tip kernel also can reproduce issue.

Analysis: Maybe driver needs to do some improvement for TGL-H because the iommu on igfx should be default off according to [1].

[1] https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html

Edited by Tiffany Wang
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