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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - I7-8700 onboard HDMI port does not support 4K resolution"
href="https://bugs.freedesktop.org/show_bug.cgi?id=112018#c7">Comment # 7</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - I7-8700 onboard HDMI port does not support 4K resolution"
href="https://bugs.freedesktop.org/show_bug.cgi?id=112018">bug 112018</a>
from <span class="vcard"><a class="email" href="mailto:jian-hong@endlessm.com" title="jian-hong@endlessm.com">jian-hong@endlessm.com</a>
</span></b>
<pre>After contact the Acer desktop's ODM, they said the onboard HDMI port is HDMI
1.4.
According to Table 4-1 Relation of the Cable category and the Supported
functions (except Type B) of High-Definition Multimedia Interface Specification
Version 1.4 [1], the maximum TMDS clock frequency can go up to 340MHz, if it is
Category 2 cable.
Wikipedia also arranges the HDMI versions comparison - Main specifications [2].
HDMI Version's Max. TMDS Character Rate
1.0–1.2a 165 MHz
1.3–1.3a 340 MHz
1.4–1.4b 340 MHz
2.0–2.0b 600 MHz
Maybe we can find some place to know the HDMI's subversion in
somewhere/registers?
[1]
<a href="http://bfiles.chinaaet.com/whpt/blog/20170919/1000008562-6364143185282736974850538.pdf">http://bfiles.chinaaet.com/whpt/blog/20170919/1000008562-6364143185282736974850538.pdf</a>
[2] <a href="https://en.wikipedia.org/wiki/HDMI#Main_specifications">https://en.wikipedia.org/wiki/HDMI#Main_specifications</a></pre>
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