<story><title>DisplayPort and 4K</title><url>https://etbe.coker.com.au/2020/02/16/displayport-4k/</url></story><parent_chain><item><author>dangus</author><text>This article does contain useful information especially since a lot of this is way less obvious than it should be to a non-technical end user.&lt;p&gt;My crappy Apple USB-C Multiport adapter simply refuses 60Hz 4K on an HDMI cable that works out of the box with Windows 10 on a GTX 1060. This is despite the fact that the product page says that this configuration with my particular Mac is supported (edit: it’s actually because I have an old adapter).&lt;p&gt;Then I use a cheap $8 USB-C to HDMI cable and it works fine on two MacBook Pro 15&amp;#x2F;16” computers (be careful here as a 2016 USB-C MacBook Pro 15” doesn’t support 4K 60Hz over HDMI but the identical-looking 2017 model and newer do).&lt;p&gt;Frustratingly, Apple doesn’t make a similar USB&amp;#x2F;power&amp;#x2F;video adapter for DisplayPort, just for HDMI. Nobody else seems to make one either unless you get into the world of expensive hubs.&lt;p&gt;For our older 2015 MacBook Pro, Thunderbolt 2&amp;#x2F;mini displayport to DisplayPort is the option.&lt;p&gt;What I’m getting at in a poorly organized fashion is that the world of single cable charge and display and device hub is definitely not here. There’s one display on the market that supports USB-C charging above 85W and it only works with newer Macs.&lt;p&gt;You can get basically the same display for $1000 less with an LG 27” 4K display and just use DisplayPort and HDMI with adapters. Saving yourself from plugging in a second thing isn’t worth $1000.&lt;p&gt;I can’t for the life of me figure out why the people who make displays with built in power supplies for USB-C charging didn’t just default it on the 100W maximum that the spec allows. What short-sighted design!&lt;p&gt;In any event, I think I don’t mind keeping that piece of hardware separate from my display, not just for reliability but for weight and bulk as well. I can easily hide a power brick under the table.</text></item></parent_chain><comment><author>paranoidrobot</author><text>The situation with HDMI is confusing enough without also introducting USB-C into the picture.&lt;p&gt;A lot of video cards and some monitors will negotiate a DisplayPort link over HDMI ports and HDMI cables.&lt;p&gt;For instance, my Intel NUC has only a single HDMI port, but plug a HDMI to DisplayPort cable in, and it&amp;#x27;ll negotiate a DisplayPort 1.2 connection to my Dell U2711 at 2560x1440@60hz.   Plug a HDMI to HDMI cable in, and plug into the HDMI port on the same monitor - no bueno, it&amp;#x27;s HDMI only and we&amp;#x27;re stuck at 1920x1200.&lt;p&gt;Another monitor, I forget the brand, was happy to negotiate DisplayPort over a HDMI port.&lt;p&gt;Introducing USB-C adapters into the mix and some adapters appear to support USB-C Alternate Mode to carry DisplayPort but only have HDMI connectors, others won&amp;#x27;t.&lt;p&gt;Then we run into potential issues where the video card&amp;#x27;s outputs may not have been wired into the USB-C controller. Though this afaict is mostly applicable to desktops with discrete GPUs.</text></comment>
<story><title>DisplayPort and 4K</title><url>https://etbe.coker.com.au/2020/02/16/displayport-4k/</url></story><parent_chain><item><author>dangus</author><text>This article does contain useful information especially since a lot of this is way less obvious than it should be to a non-technical end user.&lt;p&gt;My crappy Apple USB-C Multiport adapter simply refuses 60Hz 4K on an HDMI cable that works out of the box with Windows 10 on a GTX 1060. This is despite the fact that the product page says that this configuration with my particular Mac is supported (edit: it’s actually because I have an old adapter).&lt;p&gt;Then I use a cheap $8 USB-C to HDMI cable and it works fine on two MacBook Pro 15&amp;#x2F;16” computers (be careful here as a 2016 USB-C MacBook Pro 15” doesn’t support 4K 60Hz over HDMI but the identical-looking 2017 model and newer do).&lt;p&gt;Frustratingly, Apple doesn’t make a similar USB&amp;#x2F;power&amp;#x2F;video adapter for DisplayPort, just for HDMI. Nobody else seems to make one either unless you get into the world of expensive hubs.&lt;p&gt;For our older 2015 MacBook Pro, Thunderbolt 2&amp;#x2F;mini displayport to DisplayPort is the option.&lt;p&gt;What I’m getting at in a poorly organized fashion is that the world of single cable charge and display and device hub is definitely not here. There’s one display on the market that supports USB-C charging above 85W and it only works with newer Macs.&lt;p&gt;You can get basically the same display for $1000 less with an LG 27” 4K display and just use DisplayPort and HDMI with adapters. Saving yourself from plugging in a second thing isn’t worth $1000.&lt;p&gt;I can’t for the life of me figure out why the people who make displays with built in power supplies for USB-C charging didn’t just default it on the 100W maximum that the spec allows. What short-sighted design!&lt;p&gt;In any event, I think I don’t mind keeping that piece of hardware separate from my display, not just for reliability but for weight and bulk as well. I can easily hide a power brick under the table.</text></item></parent_chain><comment><author>lispm</author><text>&amp;gt; Apple USB-C Multiport adapter simply refuses 60Hz 4K&lt;p&gt;Don&amp;#x27;t know if it&amp;#x27;s the case for you: the older version of the adapter was limited to 30Hz @ 4K. Only the latest version supports 60Hz @ 4K.&lt;p&gt;I have both and unfortunately they look very similar. Only the fineprint gives a clue which is the newer version.&lt;p&gt;&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;support.apple.com&amp;#x2F;en-us&amp;#x2F;HT207806&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;support.apple.com&amp;#x2F;en-us&amp;#x2F;HT207806&lt;/a&gt;</text></comment>