News: 0180355645

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HDMI Forum Continues To Block HDMI 2.1 For Linux, Valve Says (heise.de)

(Wednesday December 10, 2025 @05:50PM (msmash) from the stranger-things dept.)


New submitter [1]emangwiro shares a report:

> The HDMI Forum, responsible for the HDMI specification, [2]continues to stonewall open source . Valve's Steam Machine theoretically supports HDMI 2.1, but the mini-PC is software-limited to HDMI 2.0. As a result, more than 60 frames per second at 4K resolution are only possible with limitations. In a statement to Ars Technica, a Valve spokesperson confirmed that HDMI 2.1 support is "still a work-in-progress on the software side." "We've been working on trying to unblock things there."

>

> The Steam Machine uses an AMD Ryzen APU with a Radeon graphics unit. Valve strictly adheres to open-source drivers, but the HDMI Forum is unwilling to disclose the 2.1 specification. According to Valve, they have validated the HDMI 2.1 hardware under Windows to ensure basic functionality.



[1] https://slashdot.org/~emangwiro

[2] https://www.heise.de/en/news/Valve-HDMI-Forum-Continues-to-Block-HDMI-2-1-for-Linux-11107440.html



Re: (Score:3)

by Valgrus Thunderaxe ( 8769977 )

But this is a console meant for a TV where you're not likely to have DP.

Re: (Score:2)

by karmawarrior ( 311177 )

There are plenty of dongles around that convert it, I'm kinda surprised they just didn't bundle one rather than add the port directly.

Here's one: [1]https://www.amazon.com/CalDigi... [amazon.com]

[1] https://www.amazon.com/CalDigit-DisplayPort-Adapter-Refresh-Eyefinity/dp/B0BY3SW376?th=1

Re:Use DisplayPort (Score:4, Informative)

by darkain ( 749283 )

From TFA:

These adapters don't support VRR. So you get the bandwidth, but not the full feature set of HDMI 2.1

Re: (Score:2)

by BadDreamer ( 196188 )

That dongle says it's not intended for gaming consoles, for good reason. They add latency, as conversion is active and not passive, and they do not support VRR. Nor will they allow HDR at over 60 Hz. At least not any I have found.

Re: (Score:2)

by ChunderDownunder ( 709234 )

The 'legacy' DP connection on a TV, no.

HDMI ports have inertia but the future is USB-C. The latest USB spec incorporates various bits of Thunderbolt from Intel including support for the Displayport protocol.

That said I haven't been shopping for TVs lately,

Re: (Score:2)

by ZERO1ZERO ( 948669 )

I think the HP OMEN BFD have display port. but I don't know if they are TVs.

Re: (Score:2)

by jacks smirking reven ( 909048 )

Commercial signage monitors tend to include it, as an example this [1]Sharp PN-M752 has a DP1.4 port built in. [sharpusa.com] Great! Downside is most of these screens are limited to 60Hz so you don't get a ton of benefit over a bog standard HDMI2.0. Oh and they'll be twice the price.

Dongle city is gonna be the best bet for most people. Luckily DP1.4 to HDMI2.1 adapters are pretty available now.

[1] https://business.sharpusa.com/large-format-displays/models/details/PN-M752

Re:Use DisplayPort (Score:5, Interesting)

by bartoku ( 922448 )

I fear that most DisplayPort to HDMI 2.1 dongles are not active adapters but instead passive physical connection switches. The HDMI 2.1 electrical signaling is still handled in base computer hardware when the HDMI adapter and a HDMI device is detected. That means that the base computer hardware still needs to know how to do HDMI 2.1 to supply the correct electrical signal. Although to my frustration it has never worked the other way around with a HDMI ports being simply physical convertible to a DisplayPort.

I would really love to see televisions with DisplayPort, but it seems the connector never caught on with consumer devices; the HDMI connector momentum is pretty strong sadly. I wish HDMI would go away all together. Television, GPU, and computer manufacturers just stopped playing with the HDMI Forum. Or maybe at least we will get USBC ports on televisions support DisplayPort as the protocol instead.

Re: (Score:3)

by rogoshen1 ( 2922505 )

I believe the reason for this is due to HDCP cuntery baked into HDMI, but absent from DP. So your home theater equipment including tv's and receivers will not use DP due to hollywood being a gaggle of cunts.

It makes getting proper 5.1 audio on a PC more difficult than need be. Windows doesn't help in this regard either, as the OS for whatever insane reason treats all hdmi connections as a video connection, even if you're just wanting it for audio -- so you wind up with janky phantom displays that never see

Re:Use DisplayPort (Score:5, Informative)

by bartoku ( 922448 )

I worried it might be a copy protection, but according to Wikipedia, [1]https://en.wikipedia.org/wiki/... [wikipedia.org], DisplayPort has had HDCP since version 1.1.

However, HDMI had HDCP in 2003, DisplayPort 1.1 did not get it until 2006 and it still was no universal.

In addition audio return (ARC/eARC), remote control via HDMI-CEC, and generally better over longer cable runs give HDMI some advantages in the living room.

Overall it seems HDMI benefit from being first to the living room and carrying that momentum.

Our best hope is that USBC will come for HDMI on the back of the television someday...then we can throw those HDMI cables in the bin with serial, parallel, PS/2, FireWire, proprietary phone chargers, camera connectors...

[1] https://en.wikipedia.org/wiki/DisplayPort

Re: (Score:2)

by rogoshen1 ( 2922505 )

DisplayPort has had HDCP since version 1.1.

Okay, I stand corrected. (Hollywood is still collectively a gaggle of cunts though. I stand by that statement, it's a hill I'll die on.)

Dongles (Score:2)

by DrYak ( 748999 )

> I fear that most DisplayPort to HDMI 2.1 dongles are not active adapters but instead passive physical connection switches.

Most, but not all. I litterally have a DisplayProt to HDMI + DVI + VGA combo dongle on my workstation at home.

But they tend to by a tiny bit more expensive (think 10 bucks instead of 1 bucks on AliExpress. Or 50 bucks at your local TV shop), because they require a dedicated chip inside the dongle.

> Although to my frustration it has never worked the other way around with a HDMI ports being simply physical convertible to a DisplayPort.

Depends on the device. Can happen in some professional projectors: some enterprise-grade projectors can litteraly support " any protocol over any wiring with enough pins ", i.e.: the presence of a HDMI, DP, DVI or VG

Re: (Score:2)

by bartoku ( 922448 )

I could see an active DisplayPort to HDMI 2.1 dongle with a chip inside that actually converts DisplayPort signals to HDMI 2.1 signals being possible. However I suspect it would be a bit more than $10 today. Worse yet, such a setup would most certainly add latency to an application, gaming, that is sensitive already to any delays. Gaming is what drives the 120Hz and above refresh rates...

Cheap (Score:3)

by DrYak ( 748999 )

> However I suspect it would be a bit more than $10 today.

A bit, but not much. ( [1]random example off AliExpress [aliexpress.com], that use [2]this synaptic chip [synaptics.com])

> Worse yet, such a setup would most certainly add latency to an application, gaming, that is sensitive already to any delays. Gaming is what drives the 120Hz and above refresh rates...

There's no real reason why latency should be more than a couple of "scan-lines" (well, at least the DSC's equivalent horizontal-lines, if the signal needs conversion between compression variants). And there's a big incentive: less on-chip built-in RAM - it's litteraly cheaper to make the chip only keep the most recent relevant data and immediately start streaming out the HDMI 2.1 signal as soon as possible, rather than keeping

[1] https://aliexpress.com/item/1005009885569342.html

[2] https://connect.synaptics.com/synaptics-vmm7100

SteamDeck (Score:2)

by DrYak ( 748999 )

> You can use DisplayPort instead. Is it possible to convert DP to HDMI 2.1?

Yes, that's litteraly how the SteamDeck handles this.

The SteamDeck can output DisplayPort on its USB-C connector (similar to tons of laptops and some smartphones), and the SeamDeck's Dock has a dedicated hardware chip that does the translation into HDMI signal.

This way no need to tweak any support into opensource GPL'd drivers inside the SteamDeck and then risking running afoul of HDMI's licensing restrictions.

Re: (Score:3)

by Z00L00K ( 682162 )

There are TVs with DisplayPort connectors, but they are expensive and sold more as presentation screens for computers.

Please can't someone kill HDMI, it's just causing headaches with no benefits when we have the DisplayPort now.

Sherman act? (Score:3, Insightful)

by coats ( 1068 )

This needs an anti-trust lawsuit.

Re: (Score:1)

by BeepBoopBeep ( 7930446 )

anti-law suit doesnt apply to forcing anyone to hand over specifications for free. Open source = give us free shit, we give it away for free. You gonna sue apple for not giving up the specs to operate a M chip ecosystem?

Re: Sherman act? (Score:2)

by rpnx ( 8338853 )

Sounds like a valid antitrust suit... or would be but for the insane court system which ignores most anticompetitive actions.

Re: (Score:2)

by BeepBoopBeep ( 7930446 )

Valve dont have to sue, cheaper to just pay the license fee and be on their selling their product to make a buck

Open source drivers (Score:5, Informative)

by DrYak ( 748999 )

> cheaper to just pay the license fee

The problem is that unlike Nintendo, Sony and Microsoft, Valve isn't selling a closed box with proprietary blob.

Their hardware runs Linux with a close-to-upstream kernel(*).

Among other, they are using the FOSS stack: Linux kernel driver, user space Mesa libraries, etc.

All this is GPL meaning that the code is released (or at least pull requests with the latest are wainting to be eventually upstreamed)

And the HDMI's licencing currently prohibits making that code available (or conversly, GPL means that every body should be able to read and modify the code that does HDMI 2.1 shit even people who haven't paid the license).

(*): except for the dock. The Steam Deck's dock has a dedicated chip that does the USB-C DisplayPort to HDMI conversion, so no need to tweak anything on the drivers running inside the SteamDeck.

Re: (Score:2)

by tlhIngan ( 30335 )

Funny thing - you don't need to license HDMI . You need it if you want to use the logo and advertise it as a HDMI port. But the port connector and such are freely available.

There are tons of devices with "HDMI" ports that aren't certified devices. Maybe you have a few of them plugged in right now without you knowing.

All certification gets you is a few extra things. But it isn't needed to ship a product. You could call it "Digital Video Output Port" or even "HDMI compatible digital port".

Of course, without ce

Re: (Score:2)

by higuita ( 129722 )

Valve can complain to the European commission, while HDMI group can make money, they can't limit competition and must be open to talk

Re: Sherman act? (Score:2)

by drinkypoo ( 153816 )

This isn't about a trademark. It's about a patented specification.

HDMI was born to DRM (Score:5, Insightful)

by BrendaEM ( 871664 )

Well, let's see, before HDMI, we had DVI, which worked for both analog and digital, and we had displayport which works. The problem is: the MPA has money and therefor political clout. Oddly, most of the ports on my RTX 4070 are DVI: "1x HDMI 2.1, 3x DisplayPort 1.4a"

Re: (Score:3)

by WolfWings ( 266521 )

...that's not DVI, that's DisplayPort.

DVI is the prequel to HDMI, that single HDMI port on your GPU is also putting out DVI signalling at the lower bitrates. It's also how the various RP2350 "HDMI" boards work, is the DVI protocol is a very simple subset that the early generations of HDMI was built on top of with additional data structures.

HDMI is anti-consumer (Score:3)

by OrangeTide ( 124937 )

I used to certify HDMI equipment, and the standards for HDMI were always there to protect IP rights even if it made the devices less reliable and harder to use. End-users just know that sometimes when they bought a new Blu-ray player or settop streamer that it didn't want to work at full resolution with their TV or their A/V switch or the various incompatibilities that exist between revisions.

Re: (Score:2)

by smoot123 ( 1027084 )

> The problem is: the MPA has money and therefor political clout.

Y'know, back in the day of $30 BluRay movies, I could see why the MPA would fight tooth and nail to encrypt HDMI to prevent piracy.

Color me skeptical that's nearly as important as it used to be. When's the last time you bought a BluRay? Since the vast majority of video watching is streaming now, there's so much less incentive to rip and re-distribute movies. Bigger problems are probably people sharing accounts or using VPNs to circumvent geographic restrictions.

Same thing seems to have happened to music. Si

So, why has nobody reverse engineered it? (Score:1)

by Anonymous Coward

C'mon hacker people, do your thing and jailbreak this shit!

Re: (Score:3)

by karmawarrior ( 311177 )

It's not a matter of the knowledge not existing, it's that in order to make an HDMI port you need to license a package of patents and agree to them. Random hacker might not care, but Valve, unfortunately, would be sued up the wazoo if it didn't license the package or broke the agreement that goes with it.

A DisplayPort to HDMI 2.1 dongle is the way to go, and honestly I'd either put it in the box, or if it's not legal to do that, advise people to order one at the same time, preferably using language along th

Re: (Score:2)

by Rujiel ( 1632063 )

Mod parent up

Re: (Score:3)

by ctilsie242 ( 4841247 )

That has been done, but the difference between a HDMI splitter soldered together, and being allowed to use the protocol as a mass-market company without getting sued into the ground is a different thing. HDMI is heavily patent encumbered. Ideally we move from it to DisplayPort or something a bit more open, but that doesn't seem to be the case, because almost every TV has HDMI.

Re: (Score:2)

by JustNiz ( 692889 )

> because almost every TV has HDMI.

from a quick look only, most also have displayport.

Re: (Score:2)

by ukoda ( 537183 )

One problem is the supply chain control. If you don't play ball then you can't buy the chips you need to make your product. About a decade ago I made a fast HDMI switcher for use in a retail store game display. We were able to get sample chips for product development but the supplier would not sell us chips for volume production until our hardware was HDMI certified. I think the core issue was the chip we used was stripping the HDCP as part of it operation, so was only allowed in displays, not switches

Why? (Score:1)

by PPH ( 736903 )

My laptop looks like crap compared to a TV monitor. Even an older generation TV set.

> but the HDMI Forum is unwilling to disclose the 2.1 specification.

Really? The Chinese have it*. And I bought a Chinese converter to rescue a few older but still good plasma and even CRT TV sets.

*Probably due to the fact that this is where our Windows machines come from.

Re:Why? (Score:4, Informative)

by alexru ( 997870 )

Valve has it too, but they can't make support public in the drivers until the spec is pubic. If they were working with proprietary drivers, there would not be an issue, but Valve are not assholes, and they also can't violate NDAs.

Re: (Score:2)

by Himmy32 ( 650060 )

> ... until the spec is pubic. ...but Valve are not assholes...

Yeah, that would a dick move.

Re: (Score:2)

by jacks smirking reven ( 909048 )

HDMI forum requires a license so while I bet Valve is able to get a hold of everything technical to make it work I'm thinking they'll risk lawsuit if they just make it work, might be something Chinese companies are less concerned about?

why HDMI? (Score:2)

by ne0n ( 884282 )

DisplayPort has been better than HDMI at everything since it began. Why fixate on proprietary shit?

Re:why HDMI? (Score:5, Informative)

by BeepBoopBeep ( 7930446 )

Its a steam machine, aint no TV have display port.

Re: (Score:2)

by OrangeTide ( 124937 )

Because consumers keep buying HDMI, even though it sucks.

Please use displayport (Score:2)

by rpnx ( 8338853 )

Of everything uses displayport, hdmi will die off. Consoles are the main driver, so the steam machine going displayport will create a massive incentive for TVs to use displayport. Displayport to HDMI can be bundled with the machine.

Re: (Score:2)

by flink ( 18449 )

Steam is such a tiny player in the handheld/console space, I doubt it will move the needle for most TV manufacturers. Certainly Sony would be in no rush to make things easier for them.

At This Point (Score:2)

by organgtool ( 966989 )

At this point, I think I'm over HDMI. While I haven't used any devices with DisplayPort, I'm inclined to switch to it with the purchase of my next monitor. For computing, I have a lot of issues with HDMI and I'm suspicious of HDCP being the culprit. Also, the latest versions of DisplayPort almost always have superior bandwidth compared to the latest versions of HDMI.

For home theater, I hate the fact that HDMI couples audio and video together. I understand why other people like that, but for people wi

Re: (Score:2)

by BeepBoopBeep ( 7930446 )

You just too cheap to upgrade your reciever, 4k video/audio codecs havent changed in over a decade. 4K Dolby Vision/TrueHD Audio are so old now, which means, just buy a modern receiver. Aint no one want 2 cables.

Re: (Score:2)

by organgtool ( 966989 )

> You just too cheap to upgrade your reciever

This post may be a troll, but I'll respond in the event that you're serious. At the time that I bought the Playstation 5, it came with HDMI 2.1 which was recently released and I had just purchased a television that supported HDMI 2.1 as well. However, there were no AV receivers for about a year after that which supported HDMI 2.1, let alone contained all of the sonic qualities and other features that I wanted. And that brand new TV didn't support several Dolby

Perpetuating piracy, then (Score:3)

by RUs1729 ( 10049396 )

Nothing like artificially constraining people's options to guarantee that piracy will thrive. Is it that they can't learn, or that they won't learn?

Re: (Score:2)

by ukoda ( 537183 )

It is they won't learn. They have someone telling them what they want to hear, so won't listen to people who are saying what they don't want to hear. Wishful thinking make life so much easier than facing reality.

Leave HDMI behind (Score:2)

by pcjunky ( 517872 )

Hardware designers should switch to the much more capable Display Port.

Re: (Score:2)

by ukoda ( 537183 )

Won't happen, companies don't like bad feedback and products returns. The best option is to have both Display Port and HDMI ports. People who understand the difference can then use the Display Port. Remember a typical consumer has a TV with a spare HDMI port and a HDMI cable so they expect to plug that cable into a HDMI port on the new device they brought. When they can't they return product to the store and write a scathing review about how the product didn't work.

Asking people to learn about Displa

Re: (Score:1)

by luther349 ( 645380 )

yep not like tvs just when to only hdmi. most had hdmi and component for a long time before the anlong tuner where phased out entirely

Not HDMI for the future. (Score:2)

by malvcr ( 2932649 )

What this says to me is that the future must be something open and not HDMI.

Anyway, HDMI is not a forever technology ... soon or later something better will take that place. To stay with a technology controlled by "some" is not a good idea.

Re: (Score:1)

by luther349 ( 645380 )

hdmi sticks because because it has drm so movie types make sure to keep pushing it. otherwise we would all be on display port now.

Re: (Score:2)

by JustNiz ( 692889 )

> soon or later something better will take that place.

I am under the impression that Displayport already did.

Re: (Score:1)

by luther349 ( 645380 )

there marketing it as something that can connect to a tv.

Can't Europe (Score:3)

by kwerle ( 39371 )

Can't Europe solve this for us? I expect this kind of crap in the US, but Europe tends to lean a little more toward consumers than copyright holders, right?

I wonder if pursuing this in Europe would be more fruitful than doing it here.

Done with HDMI (Score:2)

by StormReaver ( 59959 )

I will be actively seeking out DisplayPort-compatible devices for all future A/V purchases, and will recommend the same for anyone who asks. I have just become a DisplayPort evangelist.

Might have to ... (Score:2)

by PPH ( 736903 )

... give a little ground on the opensource drivers.

> Valve strictly adheres to open-source drivers, but the HDMI Forum is unwilling to disclose the 2.1 specification. According to Valve, they have validated the HDMI 2.1 hardware under Windows to ensure basic functionality.

In my experience, some Linux systems still need binary drivers for stuff like WiFi or cellular. Just hold your nose while you download the Windows driver and load it with NDISWrapper.

Another own-goal by the HDMI consortium (Score:2)

by JustNiz ( 692889 )

Congratulations on making the HDMI interface even more irrelevant compared to Displayport.

White dwarf seeks red giant for binary relationship.