21–30 of 53 posts
So there were two different ways to run DP over a cable with a USB-C connector.
Sounds like it’s good it’s dead.
USB Type-C is such a mistake for video connectivity. It just doesn’t work most of the time and when it works, any tiny move of the USB Type-C cable breaks it down.
It depends much more on the combination of monitor, source, and cable, than on native DP vs USB-C, in my experience.
HDMI Alt Mode was basically dead on arrival. The computer world pretty much standardized on DisplayPort already, so USB-C devices would already have to support DisplayPort Alt Mode anyways. Why add support for yet another Alt Mode when DP-to-HDMI converter chips are dirt cheap, and pretty much all USB-C-to-HDMI cables will be using those anyways due to the aforementioned DP ubiquity. One thing which really bothers me…
Do you know why that is? I live in the Apple world do I didn’t follow the changes.
Last time I had a PC it was VGA and DVI, which gives you a sense of the timeline. Then it seems to have been HDMI for a while (?) and now seems to be moving to DisplayPort.
Is there a reason DisplayPort over Thunderbolt didn’t catch on? Maybe something about how common add-in GPUs are making implementing TB harder?
Is there anything interesting here or is this just the spec that we have been using on laptops for ages now?
You probably haven't been using it for ages, because virtually nobody bothered to implement it. Everyone is using DisplayPort Alt Mode instead - even for C-to-HDMI adapters.
not a lot of details in this but I'm curious how the AC-coupled USB-C interface works with the DC-coupled HDMI. typically there would be a DP-to-HDMI convertor in the cable plug and just use DP alt-mode but this specifically says: "This allows native HDMI features and capabilities to be utilized in a source device and to be directly connected to any HDMI display. Other Alt Mode solutions do not enable HDMI-specific f…
Please tell me that this is not marketing speak for HDCP! What other "native HDMI" features are there that DisplayPort does not already support?
USB Type-C is such a mistake for video connectivity. It just doesn’t work most of the time and when it works, any tiny move of the USB Type-C cable breaks it down.
This is my “universal” cable;
https://www.amazon.com/dp/B093YVRHMB
- USB A and USB C on one end.
- USB C, micro USB and lightning on the other end.
- 100 W charging support
- 10Gbps data transfer
- supports video over USB-C
HDMI Alt Mode was basically dead on arrival. The computer world pretty much standardized on DisplayPort already, so USB-C devices would already have to support DisplayPort Alt Mode anyways. Why add support for yet another Alt Mode when DP-to-HDMI converter chips are dirt cheap, and pretty much all USB-C-to-HDMI cables will be using those anyways due to the aforementioned DP ubiquity. One thing which really bothers me…
> The computer world pretty much standardized on DisplayPort already Do you know why that is? I live in the Apple world do I didn’t follow the changes. Last time I had a PC it was VGA and DVI, which gives you a sense of the timeline. Then it seems to have been HDMI for a while (?) and now seems to be moving to DisplayPort. Is there a reason DisplayPort over Thunderbolt didn’t catch on? Maybe something about how commo…
Not really. HDMI is basically DVI++ but it's first and foremost a TV and video interface.
Once DVI started to be limiting, both PCs and high-end monitors adopted DP. HDMI came to PCs and monitors later, sometimes with limitations, for instance my Dell U2711 couldn't run at its native resolution over HDMI. A few years later UHD 4:4:4 was literally impossible from a PC GPU before HDMI 2.0, while not a problem even on older DP 1.2.
not a lot of details in this but I'm curious how the AC-coupled USB-C interface works with the DC-coupled HDMI. typically there would be a DP-to-HDMI convertor in the cable plug and just use DP alt-mode but this specifically says: "This allows native HDMI features and capabilities to be utilized in a source device and to be directly connected to any HDMI display. Other Alt Mode solutions do not enable HDMI-specific f…
I'd suspect "simple" is doing a lot of work here.
There is a similar situation with DP++ to HDMI adapters; they need to only shift voltage levels (3.3V for DP vs. 5V for HDMI) since the DP++ port can output “HDMI on DP wires”, but actual DP to HDMI conversion involves actually translating things at the pixel level.
How is this relevant considering DisplayPort alt mode has been a thing for a while?
It's relevant because the display just needs an HDMI port. You can plug a HDMI-to-USC-C cable into a computer and a TV or projector and it'll work using this. If your device doesn't do displayport then displayport support is moot.
HDMI Alt Mode was basically dead on arrival. The computer world pretty much standardized on DisplayPort already, so USB-C devices would already have to support DisplayPort Alt Mode anyways. Why add support for yet another Alt Mode when DP-to-HDMI converter chips are dirt cheap, and pretty much all USB-C-to-HDMI cables will be using those anyways due to the aforementioned DP ubiquity. One thing which really bothers me…
> The computer world pretty much standardized on DisplayPort already Do you know why that is? I live in the Apple world do I didn’t follow the changes. Last time I had a PC it was VGA and DVI, which gives you a sense of the timeline. Then it seems to have been HDMI for a while (?) and now seems to be moving to DisplayPort. Is there a reason DisplayPort over Thunderbolt didn’t catch on? Maybe something about how commo…
* Display turnaround time is significant. Displays can survive a decade comfortably. A few people brag about their 10000K display with 10000Hz refresh rates, but many people just keep their display until it drops or until they buy a new system. So DP took a long time to be universally supported and that hampered adoption for a long time.