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30 Posts

06-05-2014

Helsinki Finland

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  • Message 11 of 40

Re: Lenovo ThinkVision Pro2840m 4k monitor input lag

2014-09-02, 16:50 PM

The "vertical ripple" is ~70% of the time there after I reboot. However, if I go to the PBP Setup in the monitor settings (the ones accessible using the buttons on the monitor) and select single mode (even though it's already selected) and the monitor kind of reboots or flashes or whatever, the vertical tear disappears.

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3 Posts

06-13-2014

Frankfurt, Germany

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  • Message 12 of 40

Re: Lenovo ThinkVision Pro2840m 4k monitor input lag

2014-09-02, 16:57 PM
I used to have that lag, in OS X it was very apparent. But then I found a tool called SmoothMouse, which totally fixed the issue (at least on perception level). In W8 the lag wasn’t that apparent from the very beginning. 

I have a new Mac Pro, which has AMD GPUs. I don’t know why, but AMD have some with 4K output. Apple is making things better with every OS X update (no distortions anymore, now windows keep their position and size after sleep), so maybe on Windows Microsoft or AMD aren’t that concerned. 

Right now, I would say, I have no issues with my Pro2840m, neither on OS X, nor Windows 8 (GeForce 780 via DP).

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21 Posts

04-30-2014

Sequim, WA

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  • Message 13 of 40

Re: Lenovo ThinkVision Pro2840m 4k monitor input lag

2014-09-02, 16:57 PM

Wow, you're right, it's gone.  THis is the 1st time I've seen this.  This appeared after setting the monitor's resoultion to match my 2nd display, to perform the lag test.

 

Another slight annoyance, when my monitor awakes from sleep, the USB is dead.  I have to turn the monitor on/off to get it working.  This happens on a Lenovo Carbon or my desktop PC.

 

Thanks for the tip.

-Robert

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30 Posts

06-05-2014

Helsinki Finland

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  • Message 14 of 40

Re: Lenovo ThinkVision Pro2840m 4k monitor input lag

2014-09-02, 17:05 PM
Well, I definitely wouldn't say Windows doesn't have the lag issue. Since it's a huge issue for me and I use Windows.
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128 Posts

10-22-2008

United Kingdom of Great Britain and Northern Ireland

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  • Message 15 of 40

Re: Lenovo ThinkVision Pro2840m 4k monitor input lag

2014-09-02, 21:28 PM

This vertical separation on reboot you talk about which splits the screen in half, with one half being non-visible happens only 1 in the 20 times I reboot the PC if the connection between the GPU and monitor is anything other than DP-DP. So yes I have experienced it too and indeed clicking the PBP menu fixes it.

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30 Posts

06-05-2014

Helsinki Finland

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  • Message 16 of 40

Re: Lenovo ThinkVision Pro2840m 4k monitor input lag

2014-09-02, 21:35 PM

I don't know if you mean completely black or something with "one half being non-visible", but at least for me, both sides work, just out of sync or something, which then looks like a tear when something runs on both sides simultaneously.

 

EDIT: Oh and yeah I'm using DP-DP and it happens something like 70% of the time

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128 Posts

10-22-2008

United Kingdom of Great Britain and Northern Ireland

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  • Message 17 of 40

Re: Lenovo ThinkVision Pro2840m 4k monitor input lag

2014-09-02, 21:38 PM

wrote:
I used to have that lag, in OS X it was very apparent. But then I found a tool called SmoothMouse, which totally fixed the issue (at least on perception level). In W8 the lag wasn’t that apparent from the very beginning. 

I have a new Mac Pro, which has AMD GPUs. I don’t know why, but AMD have some with 4K output. Apple is making things better with every OS X update (no distortions anymore, now windows keep their position and size after sleep), so maybe on Windows Microsoft or AMD aren’t that concerned. 

Right now, I would say, I have no issues with my Pro2840m, neither on OS X, nor Windows 8 (GeForce 780 via DP).


 

 

 

May I ask you if you are encoutering either this or this issue on your Pro2840m when on Windows 8? For the no signal on POST test you should have only the Pro2840m hooked to the GPU on DP, so have all other screens disconnected, plus you should be doing a startup, not a reboot.

 

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30 Posts

06-05-2014

Helsinki Finland

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  • Message 18 of 40

Re: Lenovo ThinkVision Pro2840m 4k monitor input lag

2014-09-02, 21:44 PM
I've heard about the resizing problem from owners of other monitors too, so I think the problem is not in the lenovo. I'm not completely sure but yeah the POST stuff shows in one of my other monitors at boot. Like I said somewhere in this thread I think I maybe once managed to get it to show up on the lenovo, but I'm not 100% sure. And I will not be testing this POST stuff further at least for now since playing with the cables is a bit difficult for me at the moment. Sorry.
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128 Posts

10-22-2008

United Kingdom of Great Britain and Northern Ireland

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  • Message 19 of 40

Re: Lenovo ThinkVision Pro2840m 4k monitor input lag

2014-09-02, 21:47 PM

wrote:

I don't know if you mean completely black or something with "one half being non-visible", but at least for me, both sides work, just out of sync or something, which then looks like a tear when something runs on both sides simultaneously.

 

EDIT: Oh and yeah I'm using DP-DP and it happens something like 70% of the time


Could it be your 660Ti you think? Cause I don't have the tearing/mis-sync on my GTX670 on DP. And btw doess this mean that you get always video signal if the Lenovo is the only connected monitor on DP during POST? Either reboot or startup?

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30 Posts

06-05-2014

Helsinki Finland

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  • Message 20 of 40

Re: Lenovo ThinkVision Pro2840m 4k monitor input lag

2014-09-02, 21:49 PM
Rubear has some ATI GPU which he told about in the previous page of this thread and he reported the same tearing problem, so I'm pretty sure the problem is not in 660ti specifically.
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