On March 24, 2018 9:53:59 AM EDT, Russell Reiter <[email protected]> wrote: >On 24 March 2018 at 08:08, Giles Orr via talk <[email protected]> wrote: >> 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-fhd-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? > >lspci -d ::0c03 -k will display the vendors controller and kernel >driver in use. > >> - (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?
Oops. No usb-c display context for this monitor. This test used the display link binary and a USB 2 adapter on Ubuntu LTS. https://www.phoronix.com/scan.php?page=article&item=asus-mb16ac-zenscreen&num=2 > >I think the short answer is yes. If you can hard wire a DisplayPort to >HDMI adapter >cable you must surely be able to sink to the host connections logically >as well. > >Has somebody done this yet, I don't know. > >Since kernel 4.12 there has been development on a state machine for >hosting sinks. > >https://www.phoronix.com/scan.php?page=news_item&px=USB-Type-C-Promotion-Linux-4.15 > >Power management and signalling are all represented, soft-jacking is >another issue. > >https://superuser.com/questions/1192638/whats-up-with-hdmi-and-displayport-over-usb-c > >*Alternate mode data* > >https://github.com/torvalds/linux/blob/master/drivers/usb/typec/tcpm.c > >HTH >> >> -- >> Giles >> https://www.gilesorr.com/ >> [email protected] >> >> --- >> Talk Mailing List >> [email protected] >> https://gtalug.org/mailman/listinfo/talk >> -- Russell --- Talk Mailing List [email protected] https://gtalug.org/mailman/listinfo/talk
