Unsolved
This post is more than 5 years old
4 Posts
0
864
June 7th, 2019 01:00
U2715H, MST operation issue
Hi,
I am trying to bring up a Displayport MST link with U2715HC and a SST monitor connect in daisy chain.
I have configured the U2715HC correctly and enabled the DP1.2/MST mode.
While trying to capture the AUX log, I see that the AUX trace goes for a toss the moment I connect the SST monitor to it's DP out. Moreover, with AUX analyzer in place, I am not even able to train.
The same MST daisy chain does not work with Nvidia and AMD GPU's either.
If I replace U2715HC with U2713H, then everything works fine as expected (even with Aux Analyzer)
Is there anything special to be done to get U2715HC working?
0 events found
No Events found!
DELL-Chris M
Community Manager
•
56.9K Posts
•
232.1K Points
0
June 7th, 2019 08:00
There is no such model as U2715HC? Did you mean the U2715H? Click my DELL-name and private message me the monitor service tag number.
What specific second SST monitor model are you trying to use in Daisy Chain?
kapilu
4 Posts
0
June 9th, 2019 21:00
Hi,
I have PM'ed the service tag to you.
it does not matter on the make of the monitor. Even with other Dell monitors the Aux behaviour does not change.
DELL-Chris M
Community Manager
•
56.9K Posts
•
232.1K Points
0
June 10th, 2019 05:00
Check the private message I just sent you.
* What specific SST monitor model are you attaching to the U2715H?
* What specific "AUX analyzer" device?
* Explain "capture the AUX log"
kapilu
4 Posts
0
June 10th, 2019 22:00
It does not matter which monitor i connect as SST. I see same behaviour with Dell2713 or DellU3014 when connected as SST to U2715H.
The Aux analyzer we use is DPA-400, which i a standard equipment used.
The Aux analyzer captures all the AUX transactions that happen over the DP link. The moment i connect the AUX analyzer, the AUX transactions go for a toss. Meaning, none of the AUX transactions are executed properly. (either no ack/nack or the AUX transaction is not decoded properly)
DELL-Chris M
Community Manager
•
56.9K Posts
•
232.1K Points
0
June 11th, 2019 06:00
Which 2713? U2713H or U2713HM? If the U2713H, set the U2713H as the master and daisy chain to the slave U2715H. Does it work?
Using a Windows PC with DP out port, set the U2715H as the master and daisy chain to the slave U3014 and U2713. Do they work?
kapilu
4 Posts
0
June 12th, 2019 02:00
DELL-Chris M
Community Manager
•
56.9K Posts
•
232.1K Points
0
June 12th, 2019 05:00
We test/validate our monitors connected directly to a Windows PC. Which is what you must do to replicate and show us the issue.