Comment 4 for bug 1926755

After applying

ubuntu@ubuntu:~/workspace$ wget https://raw.githubusercontent.com/6by9/RPiTest/master/1080P50EDID.txt

ubuntu@ubuntu:~/workspace$ v4l2-ctl --set-edid=file=1080P50EDID.txt --fix-edid-checksums

CTA-861 Header
  IT Formats Underscanned: yes
  Audio: yes
  YCbCr 4:4:4: no
  YCbCr 4:2:2: no

HDMI Vendor-Specific Data Block
  Physical Address: 3.0.0.0
  YCbCr 4:4:4 Deep Color: no
  30-bit: no
  36-bit: no
  48-bit: no

CTA-861 Video Capability Descriptor
  RGB Quantization Range: yes
  YCC Quantization Range: no
  PT: Supports both over- and underscan
  IT: Supports both over- and underscan
  CE: Supports both over- and underscan

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it's working now.

@Juerg,

I already confirmed the https://lists.ubuntu.com/archives/kernel-team/2021-May/119706.html works.