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09-08-2020

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Slim 7 - flickering horizontal lines @ 2160p60 over HDMI 2.0b

2020-09-08, 18:23 PM

When connecting a Sony BRAVIA 4K TV to the HDMI 2.0b port of the Lenovo, there are lots of flickering horizontal lines at a 4K 60Hz resolution (2160p60). An Apple TV 4K is perfectly fine connected to the same port of the BRAVIA with the same cable at 2160p60 4:4:4.

 

I just bought the Slim 7 with AMD Ryzen 5 4500U in August. BIOS is up to date. I installed latest AMD Adrenalin software version 20.8.3.

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Re:Slim 7 - flickering horizontal lines @ 2160p60 over HDMI 2.0b

2020-09-21, 9:11 AM

Support seems to be a bit of a sad story. I tried a HDMI Premium certified cable which did not solve the problem. I also tried the Lenovo AMD VGA driver and latest AMD Adrenalin driver. Issue is always the same.

 

Here are two videos demonstrating the problem...

 

(1) BRAVIA bei 2160p60 (8-Bit 4:2:0) in extended desktop operation

 

The problem is very pronounced when extending desktop on a 4K display @ 2160p60.

 

(2) BRAVIA bei 2160p60 (8-Bit 4:2:0) in single display operation

 

You can spot single flickering lines in single display operation when there is movement on screen. Looks like tearing. Probable a timing or bandwidth problem.

 

Also other YouTube reviewers spotted issues with the HDMI, see this video.

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5 Posts

09-08-2020

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Re:Slim 7 - flickering horizontal lines @ 2160p60 over HDMI 2.0b

2020-09-23, 15:20 PM

I am giving up on this. I wouldn't say that Lenovo has the worst support I have ever dealt with as there is hardly any good support in the field of CE devices nowadays, but Lenovo is certainly up there with the worst. No answer in this forum and only BS questions over mail, not being able to open videos or save attached screenshots, in the end blaming Sony. Ticket closed.

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3 Posts

09-25-2020

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Slim 7 - flickering horizontal lines @ 2160p60 over HDMI 2.0b

2020-09-25, 19:30 PM
I have the exact same issue happening to me. It's fixed only if you revert to the older Microsoft Windows updates provided graphics driver, but that one has other issues (like stuttery video streaming and playback in general, it drops frames oftentimes). Right now I am using the laptop for the times I want it connected to a TV with a 4k30 output, still waiting on a possible fix. I guess this is less an AMD issue and more of a Lenovo one at this point though?
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5 Posts

09-08-2020

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Re:Slim 7 - flickering horizontal lines @ 2160p60 over HDMI 2.0b

2020-09-29, 5:23 AM

Thanks for your feedback. It is indeed a real problem. Also some YouTube reviewers are reporting about it.

 

So lets keep our fingers crossed that Lenovo will finally achnowledge the problem instead of talking people off and blaming other parties. Same story with all technical support departments nowadays. So sad. Guess that's society we are living in. People want to get away as cheap as possible so support is where those companies start to cut down.

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3 Posts

09-25-2020

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Re:Slim 7 - flickering horizontal lines @ 2160p60 over HDMI 2.0b

2020-10-06, 10:01 AM

Hey, it seems to have been fixed. Or, rather than fixed, Lenovo has released updated graphics drivers that are not a whole year old now.

The new build uses 20.10.32 and the drivers are dated to the 11th of August 2020.

Both stuttering in 4k60 videos as well as 4k60 output have been fixed. Performance seems unaffected and now I can use the good old radeon settings lite once more.

Great to know it's finally been fixed!

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Re:Slim 7 - flickering horizontal lines @ 2160p60 over HDMI 2.0b

2020-10-06, 18:05 PM

Thanks for the info. New AMD driver indeed fixes the issue. I can however only go up to 2160p60 10-bit 4:2:0 which equals to 11.14Gbps. 4:2:2 is missing at 10-bit (17.82Gbps). Full HDMI 2.0 bandwidth is however supported as I can go up to 4:4:4 at 8-bit which also equals 17.82Gbps.

 

I also tried to play some 2160p60 VP9 content via YouTube inside the Chrome browser. Works pretty flawlessly. There are some rare framedrops though.

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1 Posts

11-17-2020

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  • Message 8 of 8

Re:Slim 7 - flickering horizontal lines @ 2160p60 over HDMI 2.0b

2020-11-17, 18:33 PM

Hi,

I have the same problem with 2k monitor at 144Hz and 120Hz but not at 60Hz and on 4k TV. Unfortunately the bios and video driver update didn't fix it.

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