On Jo, 03 dec 20, 08:49:58, rhkramer@gmail.com wrote: > On Thursday, December 03, 2020 04:35:37 AM David wrote: > > On Thu, 3 Dec 2020 at 02:27, <rhkramer@gmail.com> wrote: > > > I did find out that a USB-C cable / connector has 24 conductors -- so it > > > is conceivable (with my lack of knowledge) that some laptop > > > manufacturers actually put out an (analog) VGA signal on the USB-C > > > cable. > > > > Is this just wishful thinking or do you have evidence? > > Well, I guess it could be called wishful thinking, but I tried to be pretty > clear where I was coming from: "it is conceivable (with my lack of knowledge) > that some laptop manufacturers actually put out an (analog) VGA signal on the > USB-C cable. > > But I don't know what those 24 conductors are for, and I thought it was > possible some were reserved for future use (or with the alternate modes) -- I > guess your answer clarifies that there aren't any such "spare" conductors. I know from experience what a difference it makes to use a better (typically thicker) VGA cable, especially over longer distances. Even the high quality USB-C cables with support for power delivery are thinner than a VGA cable. There's no "room" for analog signals there. Similar for the connector. > > Because it's inconceivable, as far as I'm aware. Everything I have read > > about USB-C indicates that it is purely digital. Even though it seems > > to be the USB way to have countless variations of every physical and > > electrical specification, VGA is a standard from 1987, forget finding > > it on any USB-C connector. Those pins are all used for other things. Display devices manufactured in the last (10? 20?) years are using digital technology (LCD, OLED, etc.) and have a digital input port (DVI, HDMI or DisplayPort[1]). Conversion to (video card to VGA output) and from analog (VGA input to digital display) is wasting money for the DAC/ADC and signal quality[2]. It wouldn't make sense to "hold back" a new connector like Type C with support for analog signals (besides the size requirements). These USB to VGA adapters are meant for older devices without a digital input that are still worth keeping around (e.g. projectors). [1] DVI, HDMI and DisplayPort are signal compatible, conversion is done with passive adaptors or cables. [2] do yourself a favour and use a digital connection between computer and display device whenever possible. Kind regards, Andrei -- http://wiki.debian.org/FAQsFromDebianUser
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