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[GLK] Monitor suffers no signal by power off then on to monitor when HDMI output is 4K@60Hz

Test Environment

  • Ubuntu 18.04 with kernel drm-tip (1/6/2021, v5.11-rc2) or v5.10.
  • Symptom: Suffers screen blank in 4K@60Hz resolution by power-off monitor then power-on it. There is no this issue when HDMI's resolution is set with 1080p@60Hz for the same test steps.

It seems to not have fully modeset on 4K pipe (pipe-A for HDMI-A-1 from log) then lack edid's update & probing of connector's modes further... GLK-kern-02172021.log

Edited by Gary C Wang
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