PB278Q and y510p sli, horisontal line flickering

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MikArv

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Sep 18, 2013
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10,510
Hello all!

I recently bought the Asus PB278Q and have some issues with horisotal lines flickering from time to to time. My computer is the Lenovo y510p sli with the Nvidia 750M cards. And I connect the two via hdmi. The specs said it should work to get the native resolution of 2560x1440 60 hz via hdmi and it does. Its just the flickering problem I hope there´s a solution to.

This morning I have just seen mabey two lines the last hour or so but last night it was like a disco all over the screen. Ive tried diffrent cables both shilded and not with same result. Tried all diffrent settings on the screen and nothing changes. If I lower the resolution the problems dissapear. I have no other computer that can pump out that resolution so I cant test that unfortunally.

Could the fan on the graphicscard create such a disturbance?

All help is greatly appreciated, thanks!

// Mike

 
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eatmypie

eatmypie

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Sep 12, 2013
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The laptop's screen resolution is only an issue with display cloning. Otherwise:
Single-link DVI/HDMI: 1920*1200 (newer versions of HDMI can theoretically go higher, but that's not common)
Dual-link DVI: 2560*1600
VGA: 2048*1536
DisplayPort: 3840*2160 on newer versions; and I think 2560*1600 otherwise
 
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M

MikArv

Honorable
Sep 18, 2013
8
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10,510


Yes my laptops resolution is 1080 and if I clone that I realise that the same resolution is going to appear on the external screen. Im not sure what single-link means but my graphics card specs support 2560x1440, the hdmi on both computer and screen is 1.4 and should theoreticly support up to 4k 30hz if Im not misstaken and the screen spec tells me that 2560x1440 via hdmi should not be a problem. What I couldn´t find was Lenovos specs on max recomended output via hdmi for my computer.

The last couple of hours I´ve not seen any flickering at all when working. I even tried to play Portal 2 at 2560x1440 a while to see what happens but nothing. And ofcourse now that Im writing this flicker apperd on the screen :) Mabye I should mention that my computer does not have any display port nor dvi output. Just vga and hdmi.

It just seems like if I could work for hours without problem and the screen is really crystal clear and responsive. It should be some remedy for the flickering lines?
 
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eatmypie

eatmypie

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Sep 12, 2013
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well it's not so much a problem with the display or video card more of a problem with the cable being your bottleneck not allowing that much signal to travel through at once do you have a display port on your laptop and monitor?
 
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M

MikArv

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Sep 18, 2013
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10,510


No displayport, just hdmi and vga. On the Asus screen I have them all.
 
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eatmypie

eatmypie

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Sep 12, 2013
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Yeah sadly you probably need to tweak it down to the max res that I posted in order to avoid those lines, hdmi isn't to great for high res gaming so just knock it down to about 1920x1200 and play it like that for a while and tell me if you still get the issue
 
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M

MikArv

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Sep 18, 2013
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10,510


Its not for gaming I want the high resolution, its when Im programming and wants a lot of windows open at the same time. Would lowering the hz give me a more stable picture mabye? Whats bugging me is that it sometimes works like a charm for hours then all of a sudden just flipps out.
 
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eatmypie

eatmypie

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Sep 12, 2013
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well your hdmi cable is probably pushing out the performance for a while but then after a while it just can't handle it anymore because it's going above and beyond what it is capable of doing, So you can ether try and find a even more high end hdmi cable in hopes that it works or you can down the res of your monitor to what the hdmi cable is capable of doing. Like i clone my screen at work because at this business that I manage the network for, we just have a very large high res screen it goes up to 2560x1440 I use that res because I have a display port on my laptop but my co-workers when they come in they need to display it at 1920x1080p because their laptops only have HDMI, we knocked the hz down to like 45 and their hdmi still did not work it always bugged after about 30mins to an hour. hope that answers your question
 
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M

MikArv

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Sep 18, 2013
8
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10,510


Thanks for your input today anyway, and you´re probably right. But Im a stubbard man so I´ll keep banging my head at It a bit more :) My computer do have a ultrabay at its side where my second graphiccard now is. But you can change that to a dvdplayer or just a extra fan if u like. Maybe some friendly soul makes a card with a little more output possibilities like a displayport. Hope is the last thing that leaves you :)
 
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M

MikArv

Honorable
Sep 18, 2013
8
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10,510
I just realised that the lines appears at lower resolutions aswell both 1920x1200 and 1920x1080. At school i use another external screen at 1920x1080 with vga and then I see no flickering lines.
 
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M

MikArv

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Sep 18, 2013
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10,510
If I get an usb3 to displayportadapter then? Would that inprove my chanses for an flickerfree 2560x1440 picture? Or is videooutput via usb3 a bad idea somehow?
 
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M

MikArv

Honorable
Sep 18, 2013
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10,510
Well I lowered the hz to 30 and then 2560x1440 worked via hdmi. So its not really so much a resolutionproblem as it is pictures per second. I kind of thought that if 3840×2160 at 30hz was the maximum hdmi could handle then half the resolution at 60hz would be just the same but it didnt really add up in the end unfortunally. God I hate the right winged politics that enforces the crappy hdmi tecnology especially when displayport just lying there royalty free and for everyone to use. There should be a law against money and power!
 
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