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Re: Advice on laptop with USB-C port and USB-Type C Multipoint Adapter (and VGA)

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On Sb, 28 nov 20, 09:07:14, Rh Kramer wrote:
> Advice on laptop with USB-C port and USB-Type C Multipoint Adapter
> 
> Background: a few months ago, I bought a generic / inexpensive USB-Type C 
> Multipoint Adapter (with VGA output) and around the same time ordered a laptop 
> that advertised a USB-C port.  When I received the laptop, I saw that it did 
> not have the USB-C port, so I returned it.  I kept the USB-Type C Multipoint 
> Adapter.  I also started digging into the USB-Type C port and learned that 
> there are several variations -- some that support video and some that do not.

It's useful to remember that Type C refers only to the shape of a 
connector, whereas USB (in it's various versions) refers to a bus that 
can be used to connect various external devices to a computer.

The Type C connector may or may not be used for (a combination of) USB
(usually 3.0 or higher) _and/or_ power delivery _and/or_ *digital* 
display output (and possibly more I don't know about).

> (I guess a key thing is USB-C "alternate mode" which, iiuc, under some 
> variations, can support video -- I strongly suspect that not all 
> implementations of alternate-mode support video, and even less so, all 
> variations of video.)

Regarding video output you have to consider that VGA is analog whereas 
DisplayPort and HDMI are digital.

As far as I understand, a USB to VGA adapter is basically just a video 
card that just happens to connect via USB (instead of PCI-E or so), 
while USB to HDMI (or DisplayPort) adapters could be either an external 
video adaptor connected via USB or using "alternate mode" to route the 
digital video signal directly from the internal video adapter to the 
display (only possible with a Type C connector).

Hope this helps,
Andrei
-- 
http://wiki.debian.org/FAQsFromDebianUser

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Thread

Advice on laptop with USB-C port and USB-Type C Multipoint Adapter (and VGA) Rh Kramer <rhkramer.s31@gmail.com> - 2020-11-28 15:10 +0100
  Re: Advice on laptop with USB-C port and USB-Type C Multipoint  Adapter (and VGA) Dan Ritter <dsr@randomstring.org> - 2020-11-28 18:00 +0100
  Re: Advice on laptop with USB-C port and USB-Type C Multipoint  Adapter (and VGA) Andrei POPESCU <andreimpopescu@gmail.com> - 2020-11-29 07:30 +0100
    Re: Advice on laptop with USB-C port and USB-Type C Multipoint Adapter (and VGA) Stefan Monnier <monnier@iro.umontreal.ca> - 2020-11-29 18:30 +0100
    Re: Advice on laptop with USB-C port and USB-Type C Multipoint Adapter (and VGA) rhkramer@gmail.com - 2020-12-02 16:30 +0100
      Re: Advice on laptop with USB-C port and USB-Type C Multipoint  Adapter (and VGA) Andrei POPESCU <andreimpopescu@gmail.com> - 2020-12-02 17:00 +0100
        Re: Advice on laptop with USB-C port and USB-Type C Multipoint Adapter (and VGA) rhkramer@gmail.com - 2020-12-02 17:50 +0100
      Re: Advice on laptop with USB-C port and USB-Type C Multipoint  Adapter (and VGA) David <bouncingcats@gmail.com> - 2020-12-03 10:40 +0100
        Re: Advice on laptop with USB-C port and USB-Type C Multipoint  Adapter (and VGA) <tomas@tuxteam.de> - 2020-12-03 11:20 +0100
          Re: Advice on laptop with USB-C port and USB-Type C Multipoint  Adapter (and VGA) David <bouncingcats@gmail.com> - 2020-12-03 11:40 +0100
            Re: Advice on laptop with USB-C port and USB-Type C Multipoint  Adapter (and VGA) <tomas@tuxteam.de> - 2020-12-03 11:50 +0100
              Re: Advice on laptop with USB-C port and USB-Type C Multipoint  Adapter (and VGA) David <bouncingcats@gmail.com> - 2020-12-03 22:10 +0100
            Re: Advice on laptop with USB-C port and USB-Type C Multipoint Adapter (and VGA) rhkramer@gmail.com - 2020-12-03 15:00 +0100
              Re: Advice on laptop with USB-C port and USB-Type C Multipoint  Adapter (and VGA) David <bouncingcats@gmail.com> - 2020-12-03 22:10 +0100
          Re: Advice on laptop with USB-C port and USB-Type C Multipoint Adapter (and VGA) rhkramer@gmail.com - 2020-12-03 15:00 +0100
        Re: Advice on laptop with USB-C port and USB-Type C Multipoint Adapter (and VGA) rhkramer@gmail.com - 2020-12-03 15:00 +0100
          Re: Advice on laptop with USB-C port and USB-Type C Multipoint  Adapter (and VGA) Andrei POPESCU <andreimpopescu@gmail.com> - 2020-12-04 11:10 +0100

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