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U2515H, Daisychain, 3rd has lower resolution
I have Geforce 770 GTX. I'm trying to connect 3 dells U2515h using daisy chain. I'm connecting 1 monitor using mini dp to graphic card (DP port). than 2 monitor also with mini dp to DP in first monitor. 3 monitor mini dp to DP in second one. The problem I'm having is that 3rd monitor has always lower resolution (2048x1152) instead of 2560x1440 liek monitor 1 and 2 has. When I connect 3rd monitor using separate cable hdmi to hdmi graphic card port all 3 than have full resolution. I'm not sure if it's my graphic card fault or it's some bug with mini dp daisy chaining?
DELL-Chris M
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March 30th, 2017 15:00
I was mistaken. The fault is not the video card. It is a limitation of the DP (DisplayPort) daisychain. The 3rd monitor cannot do 2560x1440.
DELL-Chris M
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March 23rd, 2017 08:00
This is the three U2515H daisychain setup you should test =
Geforce 770 GTX DP out port --> DP to mDP cable --> #1 U2515H mDP in port (DP 1.2/MST Enable)
#1 U2515H DP out port --> DP to mDP cable --> #2 U2515H mDP in port (DP 1.2/MST Enable)
#2 U2515H DP out port --> DP to mDP cable --> #3 U2515H mDP in port (DP 1.2/MST Disable)
If the #3 is still 2048x1152, then the limitation is the video card. Go back to your workaround of using HDMI.
reallukx
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March 23rd, 2017 21:00
I tested your solution but even when I turn off DP 1.2 in last monitor it's still lower resolution. I contacted EVGA my graphic card manufacturer and they said there shouldn't be a problem. I will also test DP DP cable instead of DP miniDP for last monitor.
DELL-Chris M
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March 24th, 2017 07:00
If you swap the three U2515H and test in pairs, and if all three work as both the primary and secondary in a daisychain, then the U2515H are fine. The culprit has to be the video card not being able to do all three at once in the chain.