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1 Posts

12-17-2014

Danmark

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Re: Lenovo ThinkVision Pro2840m 4k monitor input lag

2014-12-17, 15:07 PM

i have the exact same problem with this monitor.

Mouse is terrible on it, but runs perfectly on my secondary cheap 24" monitor.

 

Think il try to send it back.

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30 Posts

06-05-2014

Helsinki Finland

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Re: Lenovo ThinkVision Pro2840m 4k monitor input lag

2015-02-04, 22:41 PM

Sigh. I still haven't managed to contact the support since every time I feel like doing so it has been when I've got home from work, touched the mouse and got depressed with the lag. Thought I'd contact support but there's no email support and the phone support isn't available after 5pm.

 

I guess I should try it from work some day finally...

 

I wonder why they still haven't released new firmware publicly if they have one. Though I have almost zero hope in that it actually fixes anything and that's probably why. The hardware is probably just utter you-know-what.

 

P.S. this monitor is is definitely the worst purchase I've made in my lifetime.

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21 Posts

04-30-2014

Sequim, WA

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Re: Lenovo ThinkVision Pro2840m 4k monitor input lag

2015-02-04, 23:37 PM

How are you determing the latency?  I've seen some use a test where they compare the montor with another, non-4k monitor.  But running the Lenovo in a lower resolution than its native 4K mode slows it down as it has to resample the input.

 

I have two of these monitors and love them.  I'm not a gamer, so I wouldn't notice the latency.

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30 Posts

06-05-2014

Helsinki Finland

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Re: Lenovo ThinkVision Pro2840m 4k monitor input lag

2015-02-04, 23:48 PM

I've described previously in this thread how it's noticeable, probably especially in the first post, but shortly put: by moving the mouse, even normally on the desktop is how I notice it. It just feels bad and wrong. And laggy.

 

But I've now got a few more people (like you) saying their units are just fine, so maybe it's just mine (and a big, biiiig bunch of other owners' too) that is (are)  either broken or of an old firmware version or something and they'll be able to fix this somewhere? I hope so.

 

I'm about to start using my home computer a bit more after a bit of a hiatus so maybe this is a good time to try to get this fixed finally...

 

 

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21 Posts

04-30-2014

Sequim, WA

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Re: Lenovo ThinkVision Pro2840m 4k monitor input lag

2015-02-05, 0:29 AM

I'll take a look when I get home to see what video card I'm running.  I am runng one display at 60 FPS, the other at 30 as there's something wrong with the video card's 2nd output.  It sometimes gliches at 60 FPS.  The monitor that is running at 30FPS is very laggy. 

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21 Posts

04-30-2014

Sequim, WA

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Re: Lenovo ThinkVision Pro2840m 4k monitor input lag

2015-02-05, 3:39 AM

I saw from a previous post of yours that you are running a GTX660, which looks like a better card than my HD7800.

I'm sure that you looked at the refresh rate under adapter properties.  Anyway, my display feels quite snappy, but maybe I just don't notice it.  Is there a way to see the monitor's firmeware revision?  Isn't the data rate something like 20 Gbps at 4K @ 60Hz?  If it has a latency of 50 mS, something is buffering a lot of data.

 

Clipboard01.jpg

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128 Posts

10-22-2008

United Kingdom of Great Britain and Northern Ireland

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Re: Lenovo ThinkVision Pro2840m 4k monitor input lag

2015-02-05, 7:04 AM

Driving more than one 4K@60Hz@30bpc display is a task for only very high end professional grade GPUs such as a few select FirePro's and Quadro's.

 

So no need to worry if you can't get your second display running at 60Hz. Common consumer GPU's can only supply one 4K display at 60Hz and a secondary 4K only at 30Hz.

 

In the display menu of the Pro2840m, tapping the second icon form right (Options) then the first icon from left (Information) will display the microcode version of your monitor.

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30 Posts

06-05-2014

Helsinki Finland

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Re: Lenovo ThinkVision Pro2840m 4k monitor input lag

2015-02-25, 17:57 PM

So I called Lenovo a few weeks ago and within a week from that I had a new similar monitor brought to my door by a courier. That was cool.

 

This one says it has Microcode LN3.07 and seems to have less lag than the old one but it's still not perfect. But I guess it's good enough since my blood pressure isn't in a steady ascent when I use this one.

 

When I boot into linux the input lag seems to be a bit worse. Not sure why is that though.

 

The (afaik) cheapest 4K from Samsung that I use at work with a pretty similar computer performance-wise than what I have at home doesn't have any noticeable input lag in any environment, linux or not. So I wish the lenovo was as good. The  Samsung doesn't have an adjustable stand though.

 

I guess this problem is as solved as it'll ever be.

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12005 Posts

09-04-2014

Slovakia

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Re: Lenovo ThinkVision Pro2840m 4k monitor input lag

2015-04-09, 13:53 PM
 

Andy

 

Community Administrator
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30 Posts

06-05-2014

Helsinki Finland

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Re: Lenovo ThinkVision Pro2840m 4k monitor input lag

2016-03-18, 22:09 PM

As an update, I eventually just bought an another 4k for home use because the input lag on this one was just too much, and no other 4k monitor I've tried has the same problem. The new one was a was cheaper than this one, is IPS, and has absolutely no input lag. I wonder how these are so bad.

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