[GTALUG] Intel GPU support for HDMI 2.0 (UltraHD)

[Nicholas Krause]

On 2/10/20 12:37 PM, Lennart Sorensen wrote:
> On Mon, Feb 10, 2020 at 11:50:32AM -0500, Nicholas Krause via talk wrote:
>> If I recall HDMI 2.0 like USB 3.2 and PCI 4.0 does not require a hardware
>> upgrade. The protocol changed but older hardware should use it depending
>> on if it can handle the new requirements. This was one of the reasons
>> AMD did allow for awhile, PCI 4.0 on older Ryzen chipsets.
>>
>> If HDMI for the last two versions is like this it really doesn't make sense
>> to not allow it on certain older computers. Probably just a way for Intel
>> to sell more chips maybe.
>>
>> I could be mistaken but from memory this is what I recall,
>> Nick
> HDMI 1.0 through 1.2 had 4.95Gbps bandwidth (like DVI).  HDMI 1.3 and
> 1.4 had 10.2Gbps bandwidth.  HDMI 2.0 had 18Gbps bandwidth.  HDMI 2.1
> has 48Gbps bandwidth.
>
> So hardware changes are required to increase those link speeds.
Probably but PCI 4.0 doubled its speed without wire changes
or additions just a protocol change. Maybe HDMI can't do
that or only for minor version changes. That was from just
under 16GBs to just under 32GBs in a x16 lane.

Nick
>
> Now 2.0a and 2.0b are just small additions to the protocol of 2.0.
>
> The reason people want HDMI 2.0 and 2.1 is to get 4K resolution at a
> decent frame rate, which HDMI 1.4 ports (like what intel still puts in
> their graphics core) can't do.  30Hz doesn't cut it.
>
> 2.0 can do 4K 60Hz, but if you want HDR (so more than 24bit color) you
> have to use chroma sub sampling and then text can start to look bad.
> 2.1 can do 120Hz and has the bandwidth for HDR as well.
>