james, 6by9, thank you for your replies and explanations.
The cost difference for micro HDMI to HDMI leads vs standard HDMI isn't huge. A quick search on Ebay shows leads from £1.70. The lead we sell is £4 (+VAT), which still isn't that expensive. Any sensible distributor selling the Pi will also be selling the leads to go with it, so lack of availability is a bit of an odd claim.
The micro-HDMI are the right size, are robust (I've been plugging in and out for months with no problems), cheap, and we now sell very cost effective cables (or use an adapter) to go with them.
About the availability of Micro HDMI accessories: You can go into any almost place that sells electronics, worldwide, be it a large store or small store or bazaar, and buy HDMI cables.
For Micro HDMI, not so much. Yes large central stores and international mail-order are options. But many local places are not, especially in less developed countries. Using Micro HDMI requires planning ahead. HDMI is ubiquitous. USB-C is well on its way to ubiquity. This does place considerable additional burden on users in poor and less developed countries, including having to buy extra Micro HDMI equipment to prepare for future/unforeseen situations, or accidental breakage.
About the flimsiness of Micro HDMI, this is what I read from other users who posted about the topic. I have only ever owned one such device, an Amazon Kindle Fire HD 7 (tate), and I rarely used the Micro HDMI, but the physical connection seemed indeed less stable than HDMI. But I will wait for Pi 4 user reports before I make further comments on that.
People complained over the mini-HDMI on the PiZero too, but again it's not that big a deal.
I think the Pi Zero is much more of a niche device for fixed installations, and not so much a personal computing device. So the Mini HDMI isn't an issue for most users I imagine (if they connect displays at all).
With regards to dual height connectors, they would apply too much torque to the attachment point
6by9 wrote:All the dual-deck HDMI images that show up in that search have noticeable screw mounts next to the upper connector
There are ones who don't, like this one from Aliexpress
I understand that the mechanical stress situation on dual deck and upright connectors is worse. But OTOH they are still quite popular where horizontal space is tight, in the case of upright connectors even in very low-cost devices.
There's no facility in the SoC for display over USB, so that is a non-starter.
Output via USB-C is not supported by the SoC, therefore not an option.
I think almost no SoCs support output of display directly via USB-C, that is why Alternate mode switches are in use that mux the display and USB signals. But yes, these cost money...
And the design of the Pi is very cost sensitive.
...and that is why I guessed it was not an option, at least for now. But if the BCM2711 supports DisplayPort output (I haven't found an answer to this yet) it would at least be possible in a future revision.
The design of the Pi4 is as it is. What happens in future will happen.
Sure. I'm not holding my breath. Certainly you will need to evaluate feedback from Pi 4 users first before evaluating the next steps, and see if Micro HDMI troubles are even a blip on the radar.
6by9 wrote: ↑
Wed Jun 26, 2019 2:48 pm
Coming back to the OP's post, I'm bemused by the claim that
The problem I see with the Micro HDMI is that it is a relatively obscure connector,
It is an HDMI standard connector, and looking at many of the tablets that have HDMI, the majority have micro HDMI, with a couple having mini HDMI.
Yes, it is part of the HDMI standard. Yet it is rarely used, mostly on tablets where people don't usually connect external displays. And it has been almost completely replaced by USB-C in new devices.
You know what was part of the DVI standard? Mini-DVI. But almost nobody except Apple used it... Micro HDMI is not quite as obscure as Mini-DVI, but not far away either.
6by9 wrote: ↑
Wed Jun 26, 2019 2:48 pm
USB-C for video is the newcomer here, and requires a fair amount of support within the chipset.
It is quite new, but the trajectory if you look at smartphones and even ultra-cheap Chromebooks is clear. It may not be as ubiquitous as HDMI and won't be for some time, but still lots of places will have USB-C infrastructure in the future.