Your server apparently crashed during my edits to the above posting.
Here is the try again:
Problem solved.
I needed to plug the cable into to the back port (port 4
labeled HDMI 4k) The 3 side HDMI ports appear to all be eARC/ARC though only
port 2 is labeled specifically such. Or side port 1 may be defective. I
originally had cable plugged into side port HDMI 1.
For the back port: At 3840 x 2160 resolution the Mac Studio
will occasionally lose communication with the LG unit but at 1920 X 1080
communication is stable. However the 120Hz option is available for both
resolution settings as it should be.
Cable manufacturer is Rocketfish.
Certified Ultra High Speed label.
Is in-wall rated.
Length - 4ft,
Rated at 48Gbit, 4K at 120Hz, 8K at 60Hz, up to 10K, Dynamic
HDR.
Price at Best Buy brick and mortar store - $40.
Perhaps subject to too much crosstalk between video channels
at "4K" ( 3840 x 2160) resolution?
Better cables start at $100 up to $500 (most not seen in
stock during today's visit to Best Buy, July 24).
Note:
Apple Store at Crabtree Mall, Raleigh NC, said to call LG.
Went then immediately to close by Best Buy to confirm or
rule out the Rocketfish cable but found no qualified technical help there so I
kept the cable.
That's the condensed version of the story.
Note: UPS courtesy of Teamsters Union may be going on strike
July 31. Amazon depends on UPS. Plan your peripheral purchases accordingly.
Will keep the resolution at "2K" 120Hz due to
eyesight issues and 4k communication issues with cable - for now anyway.
Update:
Re: the Energy Saver put Studio to sleep feature - when it
kicks in it is difficult to re-establish communications between Studio and TV.
On for 2 seconds off for 2 seconds alternating after hitting the spacebar key
to get the login prompt.
Most likely an operating system issue with Ventura per 120Hz
setting?
Secondarily an issue with the cable?
Anyone with a better cable having my issue? If no then what brand of cable are you using,
length, price and from whom?