I understand you have been experiencing issues with audio through TV speakers.
Based on the description, it does not appear to be an issue with graphics controller or the graphics driver because you mentioned this is working when you replaced the cable.
When you load the latest video drivers (Intel) it loads HDMI codec, in fact, the configuration for audio output is set through different ways, and this is through Windows Sound control panel or using the software that comes with your integrated sound card.
Thank you for your reply
I have applied the latest driver (Win64_15338)
However, there was no change
I think cable is too long.
but, I have a layout constraints, I must in this way...
If I shorten the cable(1: 10m->3m), the problem does not occur.
So, I think also that there is no problem with the Intel driver.
However, the cable is long(1: 10m), the problem does not occur in Ubuntu
Therefore, I do not think also that there is a problem with the cable length.
because under the same conditions (PC, Cables, Adapters, TV), there is a difference in the Ubuntu and Windows.
As a minimum requirement, which appears as a Sound Playback Device, I think that the audio support is shown in the EDID.
is there any other conditions ?