Unable to match the requested resolution

[Dany4you]

We have a problem here on one of our computers which we cannot get solved. The Sender is a Z840 with no Monitors connected on a NVIDIA QUADRO K6000. The first time you log in via Remote Boost, everything runs without any problems. However, if I log out and reconnect a second time, I get the following message:

https://abload.de/img/unbenannttekf7.jpg 

The Senders Desktop is then frozen and only a restart of the computer will help. A normal RDP connection works without any problems.. Three other identical computers do not have this problem.

Sender

Z840

CPU 2 x Intel(R) Xeon(R) CPU E5-2667 v3 @ 3.20GHz
65GB RAM

nVidia Quadro K6000

Win10 1909 x64

nVidia Driver 27.21.14.5257 (20.10.2020)

RGS / ZCentral Sender 20.1.0

Receiver

Win10 1909

RGS / ZCentral Receiver 20.1.0.26348
2 x 24" Samsung  Display

Cu

Dany

[freesbee]

...looks like this is a quite common issue:

https://h30434.www3.hp.com/t5/HP-ZCentral-Remote-Boost-and-Connect/Unable-to-match-the-requested-res...

[Dany4you]

Will there be any reaction from HP`s side?

cu

Dany

[Argonon_Tech]

Hi Freesbee,

Just checking have you tried below?

To enable automatic EDID loading on headless workstations with Nvidia GPU:1.In rgsenderconfig, set:

Rgsender.Compatibility.Displays.ForceEdidOnHeadless to 1.

Taken from page 42 of the manual http://h10032.www1.hp.com/ctg/Manual/c06615612

Cheers,

Alasdair

[freesbee]

Of course I tried it, but I was attempting a 2xWQHD resolution (2x 2560x1440) which is NOT among the supported resolutions emulated by the RGS virtual display.

Nevertheless my understanding of the system is now much better, and I will post my findings when the issue will be completely addressed (apparently GeForge and QUADRO behave differently, but this is something I am currently validating).

To be continued...

I am a CAD specialist, I am NOT an HP employee

[Argonon_Tech]

To speed up this process please can you state all the troubleshooting steps you've done so we don't start with the obvious steps?

[freesbee]

...here a summarize of all my findings.

[GeForce]

"Senders with GeForce cards need to have at least as much physically connected display as the receiver, and the sender's displays MUST support the resolution desired at the receiver's side" (so senders cannot be "pure headless").

Physical display can be obtained with real monitors or with dongles, that does not matter, but as soon as nothing is connected to the sender card, nothing will be sent out any more.

[QUADRO]

My attempts were happening with WQHD resolution on the receiver (2560x1440) which is by Murphy's law, not (yet) included in the standard EDID file supplied by HP in RGS. Once the sender is instructed of WQHD resolution everything started working properly in all scenarios (headless and not). In order to instruct the sender about a specific resolution there are 2 possibilities:

1. connect the "still unknown display" to the sender. This will instruct it about the resolution and whatever will be done afterwards (RGS 20.1 user guide, pages 41 & 42)
2. add the missing resolution to the configuration on one sender, export the EDID file (only possible with QUADRO cards and drivers) and import your new EDID file to the other senders. After that everything will work properly.

Be aware that if your sender is NOT headless, any attempt to match a receiver with a higher resolution than the sender's attached displays will fail, so be accurate in selecting your dongles.

My experiments confirm this as well.

Thank you KellyRGS, very valuable support!

I am a CAD specialist, and I am NOT an HP employee