Intel WiDi low latency mode

I have a np900x3c and I downloaded the latest Intel WiDi 3.5 driver. When streaming WiDi to my TV the lag is huge, it feels like 2 seconds or so. I read that there's supposed to be a "low latency" or "low delay" mode but I don't see a checkbox for that in the WiDi application. The problem is I don't know where this option should even be, I don't see any screenshots or clear documentation on it.

Does anyone have this working? From what I read the supported hardware is the latest ivy bridge CPU along with the latest GPU, so it seems like the Series 9 should support it.

 

If I were you I'd try updating your Intel graphic driver or reinstall, if your laptop is WiDi capable. I have and use WiDi on a LG Tv and although there is a little lag some times, it mostly works fine.

I just checked your specs page and it doesn't look like your model is, but then again the Samsung page leave a lot to be desired

 

Where do you see a page that refers to the np900x3c and low latency mode? The version of WiDi I downloaded using SWUpdate refers to this mode somewhere in the readme.

Could you post a screenshot of your WiDi settings showing this "low latency" checkbox, so I can at least confirm where it should be?

Edit: also, I think Samsung advertises that with WiDi you can "enjoy content at 1080p". However when I use WiDi I can only use 720p, there doesn't seem to be a way to change the resolution to anything else.

By the way, does any of this depend on my TV? I also have an LG, the 47LM6400.

 

(Could you post a screenshot of your WiDi settings showing this "low latency" checkbox) no?




My Samsung is connecting to a LG 47LM6200

BTW I use the drivers I get from Intel® Driver Update Utility

Product version WiDi 3.5.40.0, the version for my model on the Samsung site is 3.0.12.0

 

And which laptop do you have?

 

Can't you see the signature >>>>>>Samsung Series 5 550P5C-S02AU 15.6" HD LED Display (1368 x 768), Anti-Reflective, 3rd Gen Intel Core i7-3610QM (2.3GHz), NVIDIA® GeForce® GT 650M Graphics, Optimus™ technolog 2GB/Intel HD 4000, 6GB of RAM, 1TB SATA III HDD 5400RPM

More importantly which version of WiDi do you have, if you're getting it from Samsung?

 

Nope, couldn't see your signature.

I have WiDi version 3.5.40.0 and Intel HD 4000 driver version 9.17.10.2932. I originally got them from Samsung and downloaded the latest ones from Intel today and I don't see any difference.

My "Behavior" tab is identical to yours, and my "Adapter" tab has only 3 things:
Device Name ("Digital Media Player"), Network Address, and the Test Audio button. I have none of that other info.

I guess my LG TV's DLNA player is different from yours, I wonder if that makes a difference.

The delay between my laptop screen and the TV is about 2 seconds.

 

That's strange, seeing that the WiDi software shouldn't be model or brand specific, in any case to try and get your system working right. May I ask if you have updated the firmware that came with your TV?

I would also try rebooting your TV, router & laptop.

 

Yep, TV has latest firmware, everything's been rebooted.

 

Well that's surprising, your laptop would seem on page to be better than mine, plus your LG is a newer model, if anyone should be having problems you'd think out of the two of us it would be me.

 

Ive had all 3 generations of widi with multiple adapters and never had "a low latancy mode"... gen 1 at 720p seemed to actually work the best for me so far

 

First off the newer low latency feature requires a new version 3 based adapter; lower latency requires changes in the PC software and the receiver software. I am not sure if the LG is capable of supporting lower latency.

Now if you are only getting 720p and have a latency of 2 seconds then you are connecting to the TV using the DLNA feature. You need to connect to the LG TV using its native Intel WiDi client. I would suggest unchecking the DLNA feature in the WiDi settings.

 

First off I know little about the technical details how this works, but I do read "stuff" like what's on the WI-FI DONGLE URL which does state >> The AN-WF100 Wi-Fi Dongle gives your LG TV a wireless connection to your home network. This enables wireless DLNA streaming from your home computer, as well as an internet connection for LG Smart TV features.<< Doesn't this kind of contradict what you've posted, have the persons who inserted this text not taken something into account, could you please elaborate?

When I connect to the LG using the WiDi I don't see any other options, I have tried the connecting using LG's version of allshare and that didn't work at all, is that "allshare" software what you mean by a DLNA connection?"

 

I'm definitely using DLNA to display the WiDi on the TV, I didn't know there was another option. By other software, you mean on the TV itself there should be another "module" or another way of using display sharing other than DLNA, or my laptop should be running something else than the WiDi software? LG offers this:
LG 47LM6400 Support: Find Manuals & Warranty Info | LG Hong kong
SmartShare PC SW(DLNA) : points to Nero
SmartShare PC SW(MediaLink): Points to Plex Media Server

 

I unchecked the DLNA field in my behavior tab and it didn't make a difference, the connection didn't behave any differently.

You don't need to use any other software in conjunction with the WiDi

If you get the smatshare to work with either of the two other software's you posted (which I couldn't) it's not the same as WiDi , you'll only be about to stream media files. e.g. music, pictures & videos. That's what I understand from reading the instructions + that's what the salesman at the electronics counter told me while window shopping before getting the LG, because LG are/were the only manufacturer with WiDi. With WiDi it's just like you have a cable connection to an external monitor.

Can I ask if you if in screen resolution you have it set to show desktop only on 2 or duplicate these display, because if I have duplicate these display I don't get FHD (1920 x 1080), plus finally the WiDi doesn't work if I have a HDMI cable connected to my laptop.

 

Sorry where is this tab, in the WiFi software or on the TV?

That's what I figured. I currently use Windows Media Player for my WiDi server so I haven't tried either of those.

I thought that might be the problem so I tried changing the display to only the WiDi, but it makes no difference. As long as my TV is connected to my WiDi the resolution is pegged at 1280x720 in both Windows settings and in the Intel display driver settings, even when the TV is the only active display.

 

It's in one of the pictures I posted before of the WiDi software, when you click properties.

I don't know what that means, don't you activate the WiDi software from here?


Sorry for the multiple pics I inserted the wrong first pic and when I tried to replace that pic, it went happy on me.

 

Sorry, I use Media Player as DLNA server for playing my videos on the TV, not for screen sharing.

So I'm really not sure what I need to do to get the "close to real-time" latency. By the way, what I'm talking about is this:

Intel

"Version 3.5 of Intel's WiDi technology ups the ante with a 10x reduction in latency, though you'll need an Ivy Bridge system paired with the latest adapters to see that kind of improvement."

As far as I can tell I have an Ivy Bridge and the HD 4000 is "the latest adapter".

 

Have you tried Change Your Wi-Fi Router Channel to Optimize Your Wireless Signal to see if a different channel makes a difference.

 

It's not the WiFi signal.

By the way, when I untick the "enable WiDi for DLNA" checkbox I can't find any other way to use WiDi on the TV, it seems like that's the only supported method. For you guys with LG TVs, how do you use WiDi or display sharing without using DLNA? When I disable that checkbox, my laptop disappears from the list of inputs on the LG TV.

 

I can't even check what it shows in input devices, if I try I automatically get disconnected from the TV. It seems to me that either your WiDi software or the firmware on your TV is completely different from what I have. Because it makes no difference to my connection to the LG if the View attachment 90898 is selected or not.

 

So what does your LG menu look like on your TV where you go to activate the PC output? I've got so much crap and LG apps on my TV that I could have missed an alternate way.

 

The pic I've posted shows the 5 steps it takes to connect my laptop to the TV.
(1) I select the WiDi from the programs list,
(2) the software opens and starts scanning for an adapter (which ever that might be, in this case it's the LG TV).
(3) Once it finds the TV,
(4) it then goes into automatically connects mode.
(5) after a couple of seconds a dialog box appears on the TV and says " The new device is requesting a connection. Do you want to watch on TV?" I then hit OK and I'm connected.



In addition

To me by this part of your last post

it sound like you're trying to connect your TV to your laptop. When it should be the other way around, I'm connecting my laptop to the TV, I don't use the WiFi dongle input.

 

Ok, so for me, in step 2, if I have the TV turned on (usually currently on input HDMI 1 because that's the only other one I use) and then I load the WiDi utility on the laptop, it starts scanning for devices, but doesn't find anything.

The TV never automatically prompts me for anything like yours. While the WiDi utility is on, I have to go to the inputs list, select the laptop, then select the WiDi, and then on the PC I get a request to connect a new device using DLNA, and if I click Yes then the TV starts streaming the screen.

I'm not sure what I'm missing. Yesterday instead of going to the inputs list I went to my settings. I set the TV to accept connections automatically. While the PC WiDi utility is scanning for devices, my TV can see it in the Display Sharing devices list. But if I click on "Connect" on the TV nothing happens, I don't get prompted on the PC or on the TV or anything. I disabled the firewall to see if that helps but no.

By the way, I use the LAN connection on my TV instead of WiFi, but IMO that shouldn't anything... I guess I can try as a last resort. Of course your LM6200 could have a different WiDi implementation than my LM6400... You can also go to the inputs list and use DLNA to stream your laptop, in that case do you get the 2 sec delay?

 

I can't see any PC/laptop input device the input device list, I'm guessing that the way you connect to your cable service is via HDMI? Because the TV here is connect to the cable service via AV and there is no input icon showing a PC/laptop.

In the input list here there are 4 icons showing a connection, 1 antenna ( the coaxial cable plugged into the wall), 2 AV (cable TV) and 3 HDMI (which is the DVD player, but that only lights up when the DVD player is on, which is only while playing DVD's) 4 is a USB device icon.

Can I ask what happens if you unplug your HDMI cable and try connecting the way I do?

OK I just tried having the DVD player turned on to see if it made a difference to the connect and it didn't, I was still able to connect to the TV via WiDi and it was work as normal good connection.

Man I'm stumped, I have no idea why you can't connect as I do seeing that the way it should work. This YouTube video should more or less how I connect.

If I were you I'd find a friend with a smart TV & adapter or take your laptop to the store where you bought the TV from and try connecting, if you get a good connection like I do or like that YouTube video, you know that your TV is the problem. Because there are a lot of YouTube videos and they all show the connecting of a laptop via WiDi as easy, without having to go into the input menu.

 

Ok, so when I do "scan for available adapters" on my WiDi utility, I never see the TV. On the LG TV I made I sure I have "share my TV" and "auto play" enabled, like here:



So why isn't my WiDi utility seeing the darn TV? This happens no matter if I have the TV connected by wired or wireless, whether I have the Windows 8 firewall on or off on the laptop. I have the latest firmware on the TV.

 

Yea the firmware on this LG is similar but it's not the same & I've never used that ever to connect. In any case I believe it should make little difference if you could connect using the method like that video shows.

I really don't know what to tell you, I know I'd be really pi$$ed off if I were you seeing how much you must have shelled out for both TV & laptop. Can I suggest you reset the factory setting in Settings >> Options >> Factory reset, maybe there is something we're missing which a reset might remedy.

I don't know if this is of any use to you Enabling Wireless Display (WiDi) on Windows 8 RTM I would try this first before the reset if you haven't got your PC to these specs.

 

Go get the latest drivers from Intel for your wireless card (mine are at 15.6.1.6) and make sure Widi app is 3.5.41 (not 40). You should be able to connect with those drivers.

 

There is latency. I'm using thinkpad T420. but there is lag. It will not so many problem if not missing any frames. But it does. I am using widi software version 3.5.34.0 and wifi driver 15.6.1.6.