Unable to support signal

[Joabarca]

Hello guys!

I had several spark room kits working just fine, and after they got this update "RoomOS 10.9.1.1 fb66b80147e" the hdmi cable to share content stopped working on all of them. It says "Unable to support signal. The cable may be too long or the quality could be compromised." I tried with different cables, changing the hdmi transmitters, decreasing the quality, etc. and I cannot make it work. Any ideas or solutions?

Thank you!

[ThiagoNeryPaulino]

HI Team, 
We have the same issue here, but we figured out all the Lenovo Laptop Intel Vpro is not able to share screen only thru extended mode, the solution here was using the Lenovo AMD, this model is working totally fine. 

Lenovo Intel VPro connected via hdmi cable:

• Extended mode works; In different resolutions and scales;
• Duplicate mode does not work; In different resolutions and scales;

With Laptops AMD, there is no issue.

Thank you

With Lenovo Intel Vpro

 With Lenovo AMD

 

[stuart.cole]

In my case there was a small break in the HDMI cable and once we replaced the cable everything was fine. That never did make sense to me as I would think a break would impact all equipment/display modes the same. It didn't in my case which caused me to believe the issue wasn't the cable initially.

[stuart.cole · Accepted solution]

FYI, We noted this on our newer laptops only. Sharing with HDMI worked fine without older laptops but the only way to get HDMI sharing to work with the newer ones was to change the display settings on the laptop to "Extend Display" instead of "duplicate display".

I did add a short HDMI to the 2nd input and I was able to share fine with the new laptops when using duplicate display.

Still not a fix but a work around.

[wesley geary]

Were you ever able to get further information for this issue?

I have a few units/touchpads where this issue comes up. Most, but not all, have cord retractors so I initially blamed that. Recently I have noticed a few without the retractors having the same issue. Switching cables has worked but doesn't seem to be a legit fix.

[stuart.cole]

We are in the process of purchasing a 50 foot long HDMI to test with. If that works, we'll replace the one in the wall with it. I think the newer laptops transmit a higher quality image requiring more bandwidth than the older cable can support over that distance.

https://community.cisco.com/t5/telepresence-and-video/cisco-spark-room-kit-hdmi-connections-issues-over-10-15ft-source/td-p/3748150

I'll provide an update once I have a chance to test.

We have also just joined a webex meeting with our boardroom system to share the screen wirelessly even when we are in the same room. We just don't use the computer audio so there is no echo. There's a bit of a lag but it's usable.

[Nithin Eluvathingal]

I think you need to reach out to TAC, Possibly a bug in the versions.