Just as an update, in the Freedesktop issue, I found using a LOWER
specced/older cable to fix the problem.
I do not know how to debug it further but I suspect the bug is in the
support of later version of the HDMI standard.
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I have previously created an upstream bug report for this:
https://bugs.freedesktop.org/show_bug.cgi?id=107668
** Bug watch added: freedesktop.org Bugzilla #107668
https://bugs.freedesktop.org/show_bug.cgi?id=107668
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