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8 Posts

08-18-2021

Russian Federation

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Can`t send 4k@120hz at 444 10bit via hmdi 2.1 from Legion 5pro to LG CX

2021-08-28, 23:47 PM

I need an answer from the support team about HDMI specification in legion 5pro laptop.

 

I can`t send 4k@120hz at 444 10bit via HDMI 2.1 from Legion 5pro to LG CX, this needs a bandwidth of 40 Gb/s.

only 4k@120hz at 444 8bit or 4k@120hz at 420 10bit maximum is available with total bandwidth of 32Gb/s.

  • Lenovo Legion 5Pro Notebook with Nvidia 3070.

  • Using the certified HDMI 2.1 cable.

  • HDMI Ultra Deep Colour has been activated for the HDMI input.

  • Nvidia drivers updated.

L5pro manual has info about maximum resolution and refresh rate (7680x4320@60Hz), but no information about bit depth and chroma subsampling, all of them are 4 main video signal parameters.

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367 Posts

03-27-2020

Philippines

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Re:Can`t send 4k@120hz at 444 10bit via hmdi 2.1 from Legion 5pro to LG CX

2021-08-29, 14:43 PM

Hello there,

 

You may need to share the MTM from the sticker so support can be specific for them to check.

 

-Dbrix

- Apologies in advance for not getting back soon on regular days. Please proceed with any Community members that can share their ideas and experiences to help.
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5592 Posts

04-23-2019

United States of America

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Re:Can`t send 4k@120hz at 444 10bit via hmdi 2.1 from Legion 5pro to LG CX

2021-09-01, 20:49 PM

Hello @Antonggold ,

 

Sorry for the late reply.

 

Please provide more information about your device. The machine type-model number (MTM) (ex 90Q800AKMH) from the underside or under the battery is best if your machine is a laptop. However if you are using a desktop machine it should be on the sticker, but please do not post your serial number which is normally in the same location. Since the machine has multiple variants we will be able to find more information once the MTM is posted.

 

Regards,

Jack_Lenovo1



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8 Posts

08-18-2021

Russian Federation

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Re:Can`t send 4k@120hz at 444 10bit via hmdi 2.1 from Legion 5pro to LG CX

2021-09-03, 22:28 PM
Legion 5 Pro-16ACH6H Laptop (Lenovo) - Type 82JQ MTM 82JQ0015RK
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5592 Posts

04-23-2019

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Re:Can`t send 4k@120hz at 444 10bit via hmdi 2.1 from Legion 5pro to LG CX

2021-09-06, 13:26 PM

Hello @Antonggold ,

 

Thanks for the MTM.

 

Based on the PSREF page the machine is capable of supporting up to 4 independent displays via native display and 3 external monitors; supports external monitors via HDMI®
(up to 7680x4320@60Hz) or USB-C (up to 5120x3200@60Hz).

 

Here's what I was able to find in terms of port information.

 

USB 2.0: 480 Mbit/s;
USB 3.2 Gen 1 (SuperSpeed USB 5Gbps, formerly USB 3.0 / USB 3.1 Gen 1): 5 Gbit/s;
USB 3.2 Gen 2 (SuperSpeed USB 10Gbps, formerly USB 3.1 Gen 2): 10 Gbit/s;
USB 3.2 Gen 2x2 (SuperSpeed USB 20Gbps): 20 Gbit/s;
Thunderbolt™ 3: 40 Gbit/s;
FireWire 400: 400 Mbit/s;

FireWire 800: 800 Mbit/s 

 

Source: https://download.lenovo.com/consumer/mobiles_pub/legion5_pro_ach_ug_en.pdf?linkTrack=PSP:ProductInfo:UserGuide

Since you mentioned that the monitor requires 40GB/s would it be possible for you to try the USB-C or Thunderbolt port instead?

 

Regards,

Jack_Lenovo1

 



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8 Posts

08-18-2021

Russian Federation

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Re:Can`t send 4k@120hz at 444 10bit via hmdi 2.1 from Legion 5pro to LG CX

2021-09-06, 14:04 PM
I`ve mentioned at the top of the topic - that I've already got the information you provided. But I need information about bit depth and chroma subsampling at 7680x4320@60Hz
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5592 Posts

04-23-2019

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Re:Can`t send 4k@120hz at 444 10bit via hmdi 2.1 from Legion 5pro to LG CX

2021-09-07, 11:38 AM

Hello @Antonggold ,

 

Sorry for the late reply.

 

Unfortunately such information is not available in the included documents for the machine.

I can try digging deeper but that will take some time for proper research.

 

Hopefully you'll allow me some more time I'll make sure to update the topic once I do find that information.

 

Regards,
Jack_Lenovo1



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8 Posts

08-18-2021

Russian Federation

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  • Message 8 of 8

Re:Can`t send 4k@120hz at 444 10bit via hmdi 2.1 from Legion 5pro to LG CX

2021-09-08, 9:21 AM
Yes, please. I hope you will get this info.
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