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Display Port problem with Dell Ultrasharp and Gigabyte MB

V0RT3X 4,568 978 August 7, 2012 at 04:32 PM
I have my Dell U2412M UltraSharp 24 LED Monitor plugged via DisplayPort to my graphic card, VisionTek 5870. When booting up the PC, the Gigabyte motherboard won't even get past POST. About 5-10 seconds into POST, the motherboard would shutdown then start back up automatically and keep doing that. The only way to get past POST is to remove the DisplayPort then let it restart itself. Once the PC is booted up, plugging the DP back in gives me back dual monitor

Also, if at anytime when the PC is running and it goes into standby and turn off the monitor, waking the PC up will only display the other monitors not on display port. The Dell Ultrasharp doesn't get any video signal and won't turn on. The only way to get signal back to it is to restart the whole PC

Tried looking through Google but no help. Any idea what I could do? Thx

Edit: Mobo is Gigabyte Z68xp-ud3

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#2
Try other ways of connecting the displays like using DVI or hdmi instead of DP or a DVI to DP cable. Verify you PSU output voltages and connection to the video card make sure all fans are spinning. Experiment with bios settings. Try a different video card if available.
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#3
Quote from jkee View Post :
Try other ways of connecting the displays like using DVI or hdmi instead of DP or a DVI to DP cable. Verify you PSU output voltages and connection to the video card make sure all fans are spinning. Experiment with bios settings. Try a different video card if available.
Absolutely no problem whatsoever connecting any monitor to DVI or VGA. This monitor is my only DP monitor so can't test it with a diff monitor. No other graphic card with DP to try either

PSU is 600W and max usage is only pushing 300 at most. It's not a problem with PSU since I can get all 3 monitors working once the PC gets pass POST or doesn't go into sleep mode
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I'm right 97% of the time. Who cares about the other 4%
#4
What outputs from the video card are you using?

You can get DP to DVI and DP to hdmi cables! They might be worth a try.
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#5
Quote from jkee View Post :
What outputs from the video card are you using?

You can get DP to DVI and DP to hdmi cables! They might be worth a try.
Video card has 4 outputs, I'm using 2 DVIs to power 2 other monitors and DP to power the ultrasharp

I'll see if I can find an active DP to DVI adaptor. Those things are quite expensive last I check Frown
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#6
Are you absolutely certain it always boots normally without the DisplayPort connection? I ask, because a hallmark "feature" of Gigabyte boards are not POSTing and just rebooting over and over. I've had several do this, and there are stories aplenty online of Gigabyte boards doing this sort of thing. I finally opened a ticket only to have Gigabyte close it summarily, with no explanation. That's it, no more Gigabyte boards for me.
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#7
Quote from redmaxx View Post :
Are you absolutely certain it always boots normally without the DisplayPort connection? I ask, because a hallmark "feature" of Gigabyte boards are not POSTing and just rebooting over and over. I've had several do this, and there are stories aplenty online of Gigabyte boards doing this sort of thing. I finally opened a ticket only to have Gigabyte close it summarily, with no explanation. That's it, no more Gigabyte boards for me.
Absolutely. It'll go on an infinite rebooting loop until I unplug the DP and the next start up would boot normally. I've been having this monitor for a few months now and it's been this way since. Just gotta leave the DP unplugged when booting up

I got fed up at 1 point and been running only 2 monitors via DVI and everything is fine. Only recently I needed to run 3 monitors again so figure I'd get to the bottom of this

I already opened a ticket with Gigabyte but haven't heard any reply back from them
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Quote from V0RT3X View Post :
Absolutely. It'll go on an infinite rebooting loop until I unplug the DP and the next start up would boot normally. I've been having this monitor for a few months now and it's been this way since. Just gotta leave the DP unplugged when booting up

I got fed up at 1 point and been running only 2 monitors via DVI and everything is fine. Only recently I needed to run 3 monitors again so figure I'd get to the bottom of this

I already opened a ticket with Gigabyte but haven't heard any reply back from them
Yeah it sounds like a different problem than mine.

There's no firmware updates for your video card by chance is there?
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#9
Quote from redmaxx View Post :
Yeah it sounds like a different problem than mine.

There's no firmware updates for your video card by chance is there?
I get something similar to this
http://en.community.dell.com/supp...ageIndex=3

Except mine is even worse that it's not even booting up

Graphic card is up to date with firmware. Not exactly sure about bios. I tried looking into bios but apparently they multiple versions of my same mobo so I wasn't sure which one to go for
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#10
http://www.meritline.com/6ft-disp...86023.aspx
http://www.monoprice.com/products...1&format=2

Take a very close look at IRQ and memory allocation information in the bios.
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#11
Quote from jkee View Post :
http://www.meritline.com/6ft-disp...86023.aspx
http://www.monoprice.com/products...1&format=2

Take a very close look at IRQ and memory allocation information in the bios.
Got myself a DP to DVI adapter, will try it out tonight
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#12
HDMI to DP (also possible to use DP to DVI + DVI to HDMI) may be more useful as you could try hooking up the hdmi output of your video card to this display.

Things to test: if the problem occurs any time this display is connected (try disconnecting all but the dp connected monitor), if the problem occurs when only two monitors are connected (including the dp one), if the problem persists when the dp monitor is connected by another interface (hdmi via adapters/ vga). Basically try every combination of things like this you can think of and see if the result differs.
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#13
Quote from jkee View Post :
HDMI to DP (also possible to use DP to DVI + DVI to HDMI) may be more useful as you could try hooking up the hdmi output of your video card to this display.

Things to test: if the problem occurs any time this display is connected (try disconnecting all but the dp connected monitor), if the problem occurs when only two monitors are connected (including the dp one), if the problem persists when the dp monitor is connected by another interface (hdmi via adapters/ vga). Basically try every combination of things like this you can think of and see if the result differs.
The adaptor works. Wonder why that is hmm
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#14
Quote from V0RT3X View Post :
The adaptor works. Wonder why that is hmm
So in this working state, are 2 or 3 monitors connected? For each monitor, what is the interface connected to the monitor and from the video card?

Do you have another DP to DP cable to test? To full iterate and test possibliities you may need at hdmi to dvi adapter or cable.
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Last edited by jkee August 8, 2012 at 03:52 PM
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Quote from V0RT3X View Post :
The adaptor works. Wonder why that is hmm
Because the DisplayPort signal isn't compatible with DVI, the design of DisplayPort requires that the graphics card sense when an adapter cable is plugged in, then reconfigure the pins to transmit the expected signal for DVI. This works because your card is a dual-mode DisplayPort compatible device.

This suggests that the graphics card's firmware is faulty in some way, causing a hardware interrupt that is handled badly by your board's BIOS. It might even be that your specific monitor is sending bad or unexpected data which just so happens to cause the firmware in the graphics card to trigger an interrupt which in this particular cases also causes a fault in the BIOS code for your model board. But when switched over to DVI, either the card handles the data appropriately, or the monitor never sends it at all.
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