I have found that if I change the U2721DE Menu- Display- USB-C Prioritization from High Resolution to High Speed Data (see page 45), I get full speed through the U2721DE via USB Type-C to my home network.
Not sure how much of an impact his will make on the display image quality, but willing to try for the sake of better network performance.
I am surprised that USB Type-C can't support both simultaneously? I believe it is cable on 10Gbps speeds when using a short, quality cable.
@geralds34 The settings change won’t affect image quality. It determines whether the display configures the USB-C link to allocate all 4 high speed lanes to video, which only allows USB 2.0 data (which is why your Ethernet adapter bottlenecked), or configures the USB-C link to allocate 2 lanes for video and 2 for USB 3.x data. The latter setup still offers enough video bandwidth to run a QHD 60 Hz display, so you’re fine there. The former choice can be useful for people who want to run a daisy chain of dual QHD 60 Hz displays from an initial USB-C connection to the first display. Systems that only support DisplayPort 1.2/HBR2 over USB-C can’t provide enough video bandwidth for dual QHD 60 Hz over only 2 lanes, but they can do it with 4. Systems that support DP 1.4/HBR3 can run dual QHD 60 Hz and USB 3.x simultaneously. That’s why that choice exists.
In terms of 10 Gbps, your understanding lacks some details. First, the 10 Gbps capability refers only to support for the USB 3.x Gen 2 standard. It’s not a bandwidth limit on the cabling itself. That USB-C cable can actually carry significantly more bandwidth when it’s carrying DisplayPort traffic. And second, as I just alluded to above, you have to look at more than total bandwidth requirements, because USB-C currently requires allocating lanes to either video or USB 3.x data. It can’t multiplex those signals, so you can’t just think of the combined bandwidth requirements of your overall setup — although USB4 will be changing this. I wrote an explainer post on the various operating modes of USB-C and TB3 with specific focus on the impact on possible display setups here if you’re curious. And on a side note, the USB-C cable you have might not even support USB 3.x Gen 2 (10 Gbps). With passive cables right now, that standard is only achievable on 3-foot cables. Cables meant to be used with displays tend to be 6 feet, where you’d either be limited to USB 3.x Gen 1 (5 Gbps) or would need an active cable to run longer distances — at least based on current passive cable manufacturing technology. But if the display doesn’t have USB ports that support higher bandwidth or any other accessories that would benefit from it, then having 10 Gbps support within the cable doesn’t add anything.
In my case it did not help. I have an U2722DE and Latitude 7490 with ASUS PB248Q 24.1" 1920x1200 monitor as second. If i set USB-C prioritization to High Speed instead of High Resolution U2722DE gets capped at 2048x1080 resolution, PB248Q resolution remains uneffected. So i have to use High Resolution and either forget about Ethernet port or live with the fact that is bottlenecked at about 300Mbps. I guess my Latitude 7490 does not support High Speed for 2 external displays.
So in that case, what's the default setting for the U2722DE then? USB-C prioritization for High Resolution? Or High Data Speed? The option is greyed out in the OSD, and I noticed that sometimes I'll get full 1Gbps through the ethernet port on the monitor, but sometimes it'll dip to 80Mbps (which was not caused by my internet service because reconnecting the ethernet cable to another device showed 1Gbps speeds as well).
What can I do in case of the P2721Q monitor which does not have the usb prioritization option itself? Connecting the ether net adapter to usb get me a max speed of 300 mbps. Is there a way to enable this option ?
geralds34
7 Posts
0
December 23rd, 2020 10:00
I have found that if I change the U2721DE Menu- Display- USB-C Prioritization from High Resolution to High Speed Data (see page 45), I get full speed through the U2721DE via USB Type-C to my home network.
Not sure how much of an impact his will make on the display image quality, but willing to try for the sake of better network performance.
I am surprised that USB Type-C can't support both simultaneously? I believe it is cable on 10Gbps speeds when using a short, quality cable.
jphughan
9 Legend
•
14K Posts
1
December 23rd, 2020 11:00
@geralds34 The settings change won’t affect image quality. It determines whether the display configures the USB-C link to allocate all 4 high speed lanes to video, which only allows USB 2.0 data (which is why your Ethernet adapter bottlenecked), or configures the USB-C link to allocate 2 lanes for video and 2 for USB 3.x data. The latter setup still offers enough video bandwidth to run a QHD 60 Hz display, so you’re fine there. The former choice can be useful for people who want to run a daisy chain of dual QHD 60 Hz displays from an initial USB-C connection to the first display. Systems that only support DisplayPort 1.2/HBR2 over USB-C can’t provide enough video bandwidth for dual QHD 60 Hz over only 2 lanes, but they can do it with 4. Systems that support DP 1.4/HBR3 can run dual QHD 60 Hz and USB 3.x simultaneously. That’s why that choice exists.
In terms of 10 Gbps, your understanding lacks some details. First, the 10 Gbps capability refers only to support for the USB 3.x Gen 2 standard. It’s not a bandwidth limit on the cabling itself. That USB-C cable can actually carry significantly more bandwidth when it’s carrying DisplayPort traffic. And second, as I just alluded to above, you have to look at more than total bandwidth requirements, because USB-C currently requires allocating lanes to either video or USB 3.x data. It can’t multiplex those signals, so you can’t just think of the combined bandwidth requirements of your overall setup — although USB4 will be changing this. I wrote an explainer post on the various operating modes of USB-C and TB3 with specific focus on the impact on possible display setups here if you’re curious. And on a side note, the USB-C cable you have might not even support USB 3.x Gen 2 (10 Gbps). With passive cables right now, that standard is only achievable on 3-foot cables. Cables meant to be used with displays tend to be 6 feet, where you’d either be limited to USB 3.x Gen 1 (5 Gbps) or would need an active cable to run longer distances — at least based on current passive cable manufacturing technology. But if the display doesn’t have USB ports that support higher bandwidth or any other accessories that would benefit from it, then having 10 Gbps support within the cable doesn’t add anything.
DaneThorson
1 Rookie
•
7 Posts
0
February 21st, 2022 04:00
In my case it did not help. I have an U2722DE and Latitude 7490 with ASUS PB248Q 24.1" 1920x1200 monitor as second.
If i set USB-C prioritization to High Speed instead of High Resolution U2722DE gets capped at 2048x1080 resolution, PB248Q resolution remains uneffected. So i have to use High Resolution and either forget about Ethernet port or live with the fact that is bottlenecked at about 300Mbps.
I guess my Latitude 7490 does not support High Speed for 2 external displays.
Jules Lee
1 Message
0
September 30th, 2022 13:00
So in that case, what's the default setting for the U2722DE then? USB-C prioritization for High Resolution? Or High Data Speed? The option is greyed out in the OSD, and I noticed that sometimes I'll get full 1Gbps through the ethernet port on the monitor, but sometimes it'll dip to 80Mbps (which was not caused by my internet service because reconnecting the ethernet cable to another device showed 1Gbps speeds as well).
Navigates
1 Message
0
January 28th, 2024 05:26
What can I do in case of the P2721Q monitor which does not have the usb prioritization option itself? Connecting the ether net adapter to usb get me a max speed of 300 mbps. Is there a way to enable this option ?