# ORIN DP MST goes fail when two of same resolution&frame rate out

**URL:** <https://forums.developer.nvidia.com/t/orin-dp-mst-goes-fail-when-two-of-same-resolution-frame-rate-out/251025>\
**Category:** Jetson AGX Orin\
**Tags:** dp-display, nvbugs\
**Created:** [April 24, 2023, 2:42am UTC](https://forums.developer.nvidia.com/t/orin-dp-mst-goes-fail-when-two-of-same-resolution-frame-rate-out/251025 "2023-04-24T02:42:38Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![larson2](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@larson2](https://forums.developer.nvidia.com/u/larson2)\
**Post date:** [April 24, 2023, 2:42am UTC](https://forums.developer.nvidia.com/t/orin-dp-mst-goes-fail-when-two-of-same-resolution-frame-rate-out/251025/1 "2023-04-24T02:42:38Z")

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hi NVIDIA team

We have a issue with DP MST mode, same like topic below

> [@DP MST issue](https://forums.developer.nvidia.com/t/dp-mst-issue/243199):
>
> About ORIN using DP to display dual screens. 4k+4K not ok 4k + 2560x1440 ok Do you have any suggestions ?? As show bellow ORIN DP → Dell U2723QE 4k60p ok ORIN DP → Samsung S27A700NWC 4k60p ok ORIN DP → Dell U2723QE → Samsung S27A700NWC Dell U2723QE 4k60p ok Samsung S27A700NWC 4k60p not ok Dell U2723QE 4k30p ok Samsung S27A700NWC 4k30p not ok Dell U2723QE 4k60p ok Samsung S27A700NWC 2560x1440 ok

It happened when using the same resolution and same frame rate,display goes fail  
example: two monitor out ,1080P@60Hz and 1080P@60Hz–\>both monitor fail  
set different frame rate, 1080P@60Hz and 1080P@ **59.94Hz** that is OK  
1080P@60 and 1080P@ **50Hz** that is OK ,too

ORIN dmesg:  
" NVRM nvAssertFailedNoLog: Assertion failed: minRequiredIsoBandwidthKBPS \<= clientBwValues[DISPLAY\_ICC\_BW\_CLIENT\_EXT].minRequiredIsoBandwidthKBPS @ kern\_disp\_0402.c:111"

We use DP MST to two HDMI output

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**Author:** ![WayneWWW](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/waynewww/32/14043_2.png) [@WayneWWW](https://forums.developer.nvidia.com/u/WayneWWW)\
**Post date:** [April 24, 2023, 3:54am UTC](https://forums.developer.nvidia.com/t/orin-dp-mst-goes-fail-when-two-of-same-resolution-frame-rate-out/251025/3 "2023-04-24T03:54:41Z")

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Hi,

It looks like a known issue and we are still tracking this internally.

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**Author:** ![dan.madill](https://developer.download.nvidia.com/images/forums/profile-default-devtalk-84.png) [@dan.madill](https://forums.developer.nvidia.com/u/dan.madill)\
**Post date:** [September 18, 2023, 2:38pm UTC](https://forums.developer.nvidia.com/t/orin-dp-mst-goes-fail-when-two-of-same-resolution-frame-rate-out/251025/5 "2023-09-18T14:38:16Z")

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I’m seeing exactly the same assertion with an HDMI display connected to an Orin Nano on an AverMedia DL131L carrier board running JetPack 5.1.2. It does not appear to affect the display but it would be nice to get rid of it.

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**Author:** ![Jackdaws\_3](https://sea2.discourse-cdn.com/nvidia/user_avatar/forums.developer.nvidia.com/jackdaws_3/32/75607_2.png) [@Jackdaws\_3](https://forums.developer.nvidia.com/u/Jackdaws_3)\
**Post date:** [December 1, 2023, 3:52am UTC](https://forums.developer.nvidia.com/t/orin-dp-mst-goes-fail-when-two-of-same-resolution-frame-rate-out/251025/7 "2023-12-01T03:52:01Z")

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Hi Larson,

Are you using a hub that supports DP MST to dual-HDMI?  
May I know the model number of the hub? Thanks a lot!

B&R  
zzw