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XPS 9560/9370, U2719DC, Daisy chain second resolution issue
I've connected my Dell XPS 9560 to my two new monitors (U2719DC) using USB C and DP (Daisy chained).
So this is the setup: XPS --> USB C --> Monitor 1 --> DP Out to DP IN --> Monitor 2
This works but the last screen can only have a max resolution of 2048x1080. I've already tried a lot of stuff. I’ve even connected a third U2719DC monitor which fixed my resolution on the second monitor. Problem is that this third monitor isn't mine so I had to disconnect it again. You advertise Daisy chaining as a feature for this screen but this doesn't even seem to work correctly. My XPS 9370 has the same problem so this problem isn’t specific to one device.
ReaperNo
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May 10th, 2019 20:00
Same question was asked and answered on this thread
Simia
2 Posts
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May 11th, 2019 02:00
I know, but there is no explanation to why this doesn't work?
PC TB3/USB Type-C out port --> U2719DC USB Type-C cable --> #1 U2719DC USB Type-C in port (2560x1440 60Hz)
#1 U2719DC DP out port --> U2719DC DP to DP cable --> #2 U2719DC DP in port (Menu- Display- MST Off) (2048x1080 60Hz)
If you read the specifications of daisy chain, it should be possible to at least connect two 2k screens.
jphughan
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October 14th, 2019 06:00
@Simia since this thread was just linked in this newer thread, so I'm just seeing this one. Over in that newer thread I just explained why your daisy chain setup isn't working when you use a USB-C to USB-C cable instead of USB-C to DisplayPort.
On a side note, referring to a resolution as "2k" is a dangerous thing to say because so many people use it incorrectly, including you in this case, and sometimes the difference can matter for technical reasons, as is the case here. 2K resolution is technically a film resolution of 2048x1080, but when used to refer to "consumer" resolutions, it actually refers to the nearest and slightly lower consumer equivalent, which is 1920x1080, aka Full HD or 1080p -- because 1920 is very close to 2000, i.e. 2K, horizontal pixels. Similarly, 4K is also technically a film resolution of 4096x2160 pixels, but when used in the consumer world refers to the slightly lower resolution of 3840x2160, aka Ultra HD or 2160p. The resolution you're referring to is rightfully called 1440p or QHD (or I guess you could call it 2.5K, but nobody does), and using either of those terms would make it much clearer to everyone what you're talking about. The reason it can matter is in situations like this, because the bandwidth difference between 1080p and 1440p displays affects available display configurations in certain setups. For example, if you had said "Why can't I run dual 2k displays?" here, if they were trying to use dual 1080p displays, then that should be possible -- but if they were trying to run dual 1440p displays as you meant to ask about, that would not be possible for the reason I explained in that thread I linked. But if someone says "2K" meaning one thing and someone else assumes they mean the other, you could end up going down the wrong path on troubleshooting for a while.
Jay M.
2 Posts
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March 8th, 2020 10:00
I had similar problem of u2717dc. I have two monitors - u3818dw, u2717dc - and them are connected like below:
rtx 2070 usb-c <> u2717dc usb-c <> u3818dw dp
And u2717dc had maximum resolution of 2048x1080.
The usb-c cable was the cable which is included in the package of u2717dc and the spec was usb 3.1 gen2.
I have changed the usb-c cable to the cable which is included in the package of u3818dw and the spec is usb 3.1 gen1.
And u2717dc has maximum resolut of 2560x1440.
I don't know why gen1 cable works but not gent2. Maybe it uses less bandwidth for data when it use gen1 cable?
Jay M.
2 Posts
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March 8th, 2020 20:00
I realized that the input color format of u3818dw is limited to YPbPr with 2nd settings - usb-c 3.1 gen1.
And the input color format of u2717dc is limitedto YPbPr with 1st settings - usb-c 3.1 gen2.
So it's reasonable and I decided to not use daisy chaining.