Originally Posted by jdsmoothie
ALLM (like eARC, which will only be released to the X3500H/X4500H/X6500H and the 2017 models they replaced) 1) does not require HDMI 2.1.
Originally Posted by rgr
Thanks for the clarification. What was confusing me was as I was looking through posts to get an idea of what ALLM was, I saw this in post #6
for the firmware update for the 2500H: "If the product is connected to ALLM compatible TV (HDMI 2.1)" - which made me think 2.1 was required.
1) This is not accurate according to the official HDMI 2.1 website. Compliance with HDMI 2.1 is done feature-by-feature. ALLM and eARC are part of HDMI 2.1. Compliance with ALLM or eARC can't be claimed as a separate item, the claim should be HDMI 2.1 compliance, and then a list of the features for which compliance is claimed.
From the HDMI 2.1 website:
Q: Can I use “HDMI 2.1” in my marketing
A: You can only use version numbers when clearly associating the version number with a feature or function as defined in that version of the HDMI Specification. You cannot use version numbers by themselves to define your product or component capabilities or the functionality of the HDMI interface.
This method of listing compliance with HDMI 2.1 may seem a bit confusing, and it is. A package or advertisement for a product might (there are no actual examples as yet) say:
HDMI 2.1 Compliant
As time goes by manufacturers will certify HDMI 2.1 compliance with more features. Ultimately a product may say:
HDMI 1.2 Complaint
All features. (This would mean that this device can connect to another device and support any of the features of HDMI 2.1
Most everything that is publicly available on HDMI 2.1 is included on the HDMI 2.1 website. This website continues to evolve overtime.
If you have an interest in HDMI 2.1, then instead of wondering or guessing about HDMI 2.1 is it best to read the following website and you'll know as much anyone in the general public.
The manufacturers are being very secretive about their plans for HDMI 2.1, and when various features will be introduced. Likely worries about potential issues caused by the Osborne Effect is partly responsible for the secrecy.