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May 13th, 2026 20:11
U4025QW and daisy chaining issues
Hello. I've got the following:
- U4025QW
- U2722DE
- U2719D
- A desktop PC with an RTX 3070 running Windows 11
- A Dell Pro Max 14 laptop (the variant with the Intel GPU)
The connections are as follows:
Laptop (TB4) -> 4025 (TB out) -> 2722 (DP out) -> 2719
Desktop (DP) -> 4025
Couple of questions:
1) With the laptop connected, I'm only able to get full resolution and full refresh rate when I disable the laptop's built in display; if I enable it, the 4025 drops to 60 Hz max. Is there a way around this or is it a limitation of the GPU? Same limitation seems to apply if I connect the 2722 separately to the laptop as well. I'm not missing screen real estate, but I'm considering keeping the laptop open because I sometimes want to use the fingerprint sensor, the webcam and so on, so might as well use the screen too.
2) With the desktop, I couldn't get the daisy chain to work this way - i.e. with just the 4025 connected via DP, the 2722 and the 2719 don't get recognised at all. Is there a setting that I might be missing or is it a hardware limitation? On the 2722 and 2719 MST is enabled, the 4025 doesn't have that setting at all. I still got the setup to work by hooking up the 2722 separately via DP directly to the desktop, but I would prefer the simplicity of just one interface cable and the convenience of also using the 2722's USB ports (the 2722's USB doesn't seem to work even though I selected the Thunderbolt for USB in the menu; it works with the laptop).
3) Can I daisy chain a DP only monitor? If I disregard the 2722 from my example and I want to connect the 2719 (or another display without USB-C/TB) daisy chained, what kind of cable or adapter do I need? I previously had a DA310 and I suppose it would've worked, but I sold it, plus in this case I would only care about the DP out.
Any suggestions are welcome, thanks in advance.
DELL-ChrisM2
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May 14th, 2026 14:11
The U4025QW does not have a DP out port. So no, you cannot daisy chain from the U4025QW when connecting to the U4025QW DP in port.
Desktop RTX 3070 DP out port --> U4025QW DP to DP cable --> U4025QW #4 DP in port
Desktop RTX 3070 #2 DP out port --> U2722DE DP to DP cable --> U2722DE #4 DP in port (MST On)
U2722DE #5 DP out port --> U2719D DP to DP cable --> U2719D #3 DP in port
I am very confused as to your Laptop setup.
According to the U4025QW User's Guide, it only allows TB4 daisy chain in this setup =
Computer TB4/USB-C video port --> U4025QW 1.5 M TB4 cable --> U4025QW #6 TB4 upstream port
U4025QW #5 TB4 downstream port --> retail 1.5 M TB4 cable --> second Thunderbolt monitor TB4 upstream port
Unless I just missed it, the U4025QW User's Guide never shows using a daisy chained second monitor DP in?
The U4025QW Menu --> Display even specifies Thunderbolt Daisy Chain = Optimized or Standard
kminkov
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May 14th, 2026 18:06
What's confusing about the laptop setup? Let me know and I'll try to clarify.
It's a work laptop and private desktop, I'm on the laptop during work hours and use the desktop the rest of the time. My aim is to be able to easily switch between the two; no simultaneous use needed (besides maybe occasionally leaving the laptop plugged in and powered on while using the desktop). In general I'm trying to optimise the switching process, i.e. the least cable plugging in and out and the least button presses needed.
What I was confused about is the following:
I.e. the daisy chain works with just the TB 4 cable from the laptop to the 4025, but I'm only able to get 120 Hz on the U4025QW when the laptop screen is off - and I could be wrong, but my understanding is that the laptop's built in screen doesn't take up any of the Thunderbolt bandwidth, so this is a GPU, not interface bandwidth limitation.
Ideally I'd want laptop screen on and 5120x2160@120 + 2560x1440@60 + 2560x1440@60, not sure if it's possible.
As for the desktop, I'm looking at this page, and according to the Daisy chain connection matrix table, the "DP in, TB out" scenario should be possible (second row of the table). I think I have gotten it to work a couple of times, but it seems unreliable, and the 2722 doesn't seem to pass the DP signal to its DP out (so if it ever works, I'm only seeing the 4025 and the 2722, but not the 2719).
I'm also a bit confused about the Power button sync feature. I've set it up, but if I turn off the laptop while it's still connected, I'm unable to make the monitor wake up at all when turning on/waking up my desktop afterwards. If I turn on/wake up the desktop before turning off the laptop, it seems to work, but I feel this shouldn't be required (it makes things less flexible). Ideally I'd expect the monitor power button to only double the laptop's when that is the selected input, and function normally with the rest of the inputs.
(edited)