topic Re: Extremely Laggy HDMI and Dex Problem in Tablets

Extremely Laggy HDMI and Dex Problem

EmirTA — Wed, 01 Nov 2023 12:19:00 GMT

Hello, I am having an extremely bad experience when I connect my Galaxy Tab S9 Plus and Tab S8 Ultra devices to an external display with a high-resolution adapter. The screen refresh rate of tablets suddenly drops and becomes truly unusable after connecting. I thought that the adapter might consume too much energy, so I tried while charging it, but nothing changed and there was no improvement. When I first bought my Galaxy tab S8 Ultra, I never had such a problem. But after an update, this problem occurred by itself. I am experiencing the same problem even with the Galaxy Tab S9 plus device that was released this year, and I would like to be informed about this issue and also I need to fix them as soon as possible

Re: Extremely Laggy HDMI and Dex Problem

LongHiker — Wed, 01 Nov 2023 14:03:55 GMT

@EmirTA Can you provide more information on the "high-resolution adapter"? Is it just a high quality cable or some type of device?

Re: Extremely Laggy HDMI and Dex Problem

Ecto — Fri, 12 Jan 2024 00:10:01 GMT

Happening to my new Tab S8+ and Monoprice USB Hub with HDMI that I got for Christmas as well. HDMI output is super low frame rate and very high latency, and tablet screen itself turns super low frame rate and high latency as well, making both unuseable. Hub is the Monoprice 6-in-1 usb-c multiport adapter. It does not require power to function.

Re: Extremely Laggy HDMI and Dex Problem

bill-e — Fri, 12 Jan 2024 15:12:50 GMT

Reproduce the issue and then open the Samsung Members app, click on Support (Lower right)->Feedback->Send Error Report, Remember to check on "Send System Data Log"

Re: Extremely Laggy HDMI and Dex Problem

bill-e — Fri, 12 Jan 2024 15:20:28 GMT

Did anything change recently, the hub or the cable?

I use a direct USB-C connection to my monitor and don't havr any issues. Does your monitor have a USB-C input that you can try?

Also in Developer Settings you can turn on a framerate/resolution monitor. Open Settings from the display that you want to watch and search on GPU. It should return a GPUWatch setting in Developer Options. Turn that on and a display will appear with the live video information.

Re: Extremely Laggy HDMI and Dex Problem

Ecto — Sat, 10 Feb 2024 01:25:01 GMT

I just sent an error report as you suggested. Per your other comment, I do not have a way to connect my monitor via USBC. I guess I could get a USB c to HDMI cable but I shouldn't have to do that, a hub should work like they used to for lots of people before they stopped working.

I also turned on the frame rate monitor in the corner, and even while the monitor and tablet were laggy the frame rate didn't change so it wasn't properly representing what was happening on screen.

Re: Extremely Laggy HDMI and Dex Problem

bill-e — Sat, 10 Feb 2024 19:54:17 GMT

What resolution/framerate were you getting out of that hub before the issue popped up?

Re: Extremely Laggy HDMI and Dex Problem

Ecto — Mon, 12 Feb 2024 17:16:54 GMT

I was never able to get smooth display out of the hub. It happened since the beginning of trying it. The resolution seems to be the full 4K of my TV, but the framerate on both displays drops to 10-15 it seems, with maybe 300-500ms of latency of touches.

Re: Re: Extremely Laggy HDMI and Dex Problem

bill-e — Mon, 12 Feb 2024 17:52:58 GMT

TVs tend to upscale to 4k. With a working hub I was able to get 2560x1440p and 1gE out of my Tab S8U vua the hubs hdmi port.

Everything plugged into the hub affects the video bandwith as neither thr tab 8 or 9 have enough out of the port to support 4k hdmi on the less expensive hubs and it yours is just doing hdmi with nothing else plugged into it then I'd wager that there is something wrong with it or it's a **bleep**. Neither of my working.hubs.were more.than 25$.

try a different hub and hope for 2560x1440p 60hz out of it using DeX or native resolution using mirroring.

Re: Re: Extremely Laggy HDMI and Dex Problem

Ecto — Mon, 12 Feb 2024 20:57:04 GMT

I just tried plugging into my computer monitor through HDMI with the hub and it still had the same issue. My monitor said it was receiving a 3840x2160 signal, though 1440p is the res of the monitor. I looked through all the settings on my tablet and didn't see an option for resolution.

So I guess I'll see if I can return this hub and try out a different one. Can you share the brand of the ones you have that work for you?

Re: Re: Extremely Laggy HDMI and Dex Problem

bill-e — Mon, 12 Feb 2024 22:02:31 GMT

First, boot to DeX on the external monitor. Then from the external monitor open Settings->Samsung DeX->Display Resolution. If your monitor supports 4k you will see it listed as an option but selecting it may not change the resolution. Your hub, at best will do 4k30. I would suggest trying one of the available 2560x1440 display options and see how that goes.

Both of my hubs are now discontinued and no longer on Amazon. Virtually any multiport hub with power pass through should work and you don't need to spend a lot on one.

Re: Re: Extremely Laggy HDMI and Dex Problem

Ecto — Mon, 12 Feb 2024 23:31:00 GMT

Cool, I got a bit closer this time, but still not great. I guess since I was in the new Dex mode, I could only mirror, so switching back to the Classic allowed for me to have the extended display with Dex on it. It worked well on my computer monitor, and could choose the proper resolution for the display and the tablet still worked mostly smooth.

But when I tried the same thing on my TV again, it made my tablet laggy, though not as laggy as before. Also there was no 4K option in the settings to choose, only 1080 and HD+. It seemed to be pretty smooth on the TV, but the tablet control and virtual mouse pad was iffy. It would register drags as touches sometimes, clicking on unwanted things, and there was a bit more latency on the tablet side of function as well. I guess I'll probably just give up on trying to use it on my TV, but if I change my mind on that, I'll just pick up another hub of some kind.

Thanks for your help!

Re: Re: Re: Extremely Laggy HDMI and Dex Problem

bill-e — Tue, 13 Feb 2024 00:47:29 GMT

Download Good Lock from. the Galaxy Store, from within it enable Multistar. Open Multistar and click on I Love DeX and enable Hi Res on an e ternL monitor. then reboot and try DeX Classic again.