Originally Posted by MMC57
Why do you say it will fail for all compressed 2.1 formats?
From the literature so far provided by RUIPRO, and given that Valens doesn’t even have full support for compressed formats yet, it doesn’t look like the RUIPRO will support compressed 2.1 formats. So, technically, The cable will fail these tests when AV Arrow performs them.
How it will act for the end user depends on how RUIPRO implemented their firmware.
Assuming the RUIPRO does not support compressed formats when used between HDMI 2.1 devices that support the full range of compressed and uncompressed formats:
Best case scenario: the RUIPRO doesn’t get confused by EDID information from display and source that lists support for compressed formats and, instead supplants its own EDID info stating more limited support (which will tell the source system not to try to send compressed formats). So in this case, the cable should work fine for all non-compressed formats and the user won’t even see an option on their source system to provide the higher-bandwidth signals.
Not-So-Great-Case: the RUIPRO passes the EDID information as-is between source and display so the source device believes it can safely transmit both uncompressed and compressed signals - also note that in this scenario, source devices will be eager to use compression because it will allow longer runs and/or cheaper cables to work now under compression whereas they wouldn’t before as uncompressed. Because the RUIPRO doesn’t know what to do with a compressed signal (and given that the source device thinks it can send compressed) any compressed signal that the source device sends will fail at the cable and not make it to the display. Because the source device will be operating on eager compression mode, some formats that may not be compressed today that would work will stop working with the RUIPRO on 2.1.
Worst-Case: the RUIPRO gets confused by the unknown EDID info and crashes, failing to work at all. (This was seen as recently as 2018 with Denon receivers that didn’t understand the VRR EDID being sent by 2018 Samsung displays). In this case the end user get no signal at all.
Now while all that was in reference specifically to RUIPRO, it applies equally to any active HDMI technology that’s currently on the market.