On 23 March 2018 at 20:01, Scott Sullivan via talk <[email protected]> wrote:
> On 2018-03-23 12:50 PM, Giles Orr via talk wrote: > >> A couple days ago I got a Best Buy flyer, and they have this item: >> >> https://www.bestbuy.ca/en-ca/product/asus-zenscreen-15-6-fhd >> -60hz-5ms-gtg-ips-lcd-monitor-mb16ac-dark-grey/10737845.aspx < >> https://www.bestbuy.ca/en-ca/product/asus-zenscreen-15-6-fh >> d-60hz-5ms-gtg-ips-lcd-monitor-mb16ac-dark-grey/10737845.aspx>? >> >> It's a portable IPS LCD screen from Asus. I have a similar item from >> about three years ago that has two connectors, one for USB power-only and >> the other for VGA/HDMI. There were other models at the time that used only >> one connector, USB for both data and power - but that required a driver >> (and would have been painfully slow if it was USB2). >> >> But now here's this new model: it's one connector only, USB-C. And >> presumably USB3.1. And USB3.1 can carry video. But at this point I get >> lost among the standards and their implementations and which one supports >> what. I have an Asus Zenbook (it's Linux-only at this point) that has a >> USB-C connector, but I suspect it's USB3.0. So the first question is: how >> do I check that? Second, does Linux support video-over-USB3.1? Do I need >> a special cable? Is this "Thunderbolt?" How can I check if my machine >> would support this? >> > > The Spec you linked say it's DisplayLink, which is the software based > video solution that requires a driver. > > https://en.wikipedia.org/wiki/DisplayLink > > USB-C is only a specification for a cable and connector, and somewhat > agnostic about the data communications spec used across it. The cables are > of high enough quality that they can support multiple data communications > specs, generally referred to as alt-modes. > > https://en.wikipedia.org/wiki/USB-C#Alternate_Mode_partner_specifications > > Thunderbolt 3 for example co-oped the USB-C cable spec for it's cables, > much like in the previous generations it co-oped the mini-displayport cable > spec. > > Intel makes a point that a port carrying Thunderbolt 3 should also be > cross wired with USB 3.X and Display Port hardware to output those signals > as well. > > So if you want a monitor that uses a Type-C connector, your looking for a > display-port monitor. Which your not likely to find in the portable market > yet. > > Now that I knew what to look for, re-examination of the text and pictures shows a couple interesting things: "USB Type-C connectivity with hybrid signal solution for Type-C and Type-A source compatibility (requires a DisplayLink driver for Type-A connection)." So it's implying that it doesn't need a driver for Type-C. And looking at the pictures, there's a "DisplayPort" icon next to one of the buttons on the front. So ... My other questions stand: - how can I figure out what USB protocol (3.0 or 3.1) the type-C connector on my Linux computer supports? - (clearer understanding leads to a clearer question here, although I'm still not sure I'm saying it right) does Linux support DisplayPort video over USB-C? -- Giles https://www.gilesorr.com/ [email protected]
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