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DisplayPort flicker on monitors

post #1 of 40
Thread Starter 
Hey all

I have two R6950's in crossfire connected to three monitors:

2 Dell U2412M's via DisplayPort
1 Samsumg P2350 via DVI

It is important to note that before this I only had the two Dell's attached, and they were both using DVI. I had this set up for about a week of constant sleeping/resuming and the issue never occurred.

What happens is, either of the Dell's just flicker on/off constantly and only a system reboot fixes it. During reboot the flicker does not occur (i.e. POST, BIOS screens are OK, Windows boot screen is OK).

Has anyone heard of this issue?
It sounds like something specific to DisplayPort...
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post #2 of 40
My guess is that your video card is not applying the correct clocks after resuming from it's standby mode, but applies them correctly at boot... You could check that with a program (afterburner does this i'm pretty sure) if you can manage to see anything lol
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post #3 of 40
Thread Starter 
Well I've got three screens so I should be able to see on at least one!


That would not explain why the issue didn't occur when connected via DVI though, however I will check it out wink.gif
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post #4 of 40
Thread Starter 
Update: Nope, correct clocks are being applied.
Update 2: Plugging out and in again the DP cable from the GPU fixes the issue.

Does DP really suck that bad?

I'mj also using mini DP to DP adapters on the cards because that's the only way... could these be causing issues?

If I can't fix it, I might just put them back on DVI and use HDMI to DVI for the third monitor... *sigh*

I'm also using the Catalyst 12.1 preview drivers... but I'm pretty sure I had those when connected via DVI.... might be worth rolling back?
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post #5 of 40
Dang, the clocks were a longshot anyways tongue.gif. That should cause tearing, but not an all out flicker.

Now that I think back, I had a 5870 that would cut out the picture on it's display port, but it's DVI worked fine. Since I was crossfiring and the card worked fine otherwise, I just switched which card I plugged everything into. I don't remember having any problems after that.

Since it looks like you are running crossfire as well, you could try switching everything to the other card. If it still does it, I would say it's a software issue somehow... if it doesn't do it, you're probably looking at a hardware issue on that specific card.
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post #6 of 40
Thread Starter 
Can I connect monitors to both cards and eliminate DP altogether? (e.g. Two DVI on the top card, other DVI on the bottom card)

I could do this with SLI...
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post #7 of 40
Unless something changed with the 6 series, they all need to be on the same card still. As a side note I haven't had any issues with DP and my 6970/zr30w combo. I don't think the issue you are experiencing is an inherit issue with the 6series or DP in general.

DVI does seem to have less problems though, I can see why you would want to stick with it.
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post #8 of 40
Thread Starter 
Quote:
Originally Posted by Crazy9000 View Post

Unless something changed with the 6 series, they all need to be on the same card still. As a side note I haven't had any issues with DP and my 6970/zr30w combo. I don't think the issue you are experiencing is an inherit issue with the 6series or DP in general.
DVI does seem to have less problems though, I can see why you would want to stick with it.

Nope nothing has changed... just tried it frown.gif Damnit... I love my AMD's, but nvidia seemed to have a little more flexibility... anyway doesn't matter about that!

Can I hotswap everything to the second card or do I need to reboot for it to realize "hey someone plugged some crap into me!"? smile.gif

If I can't get it to work I'll just hook the third monitor up via HDMI using an HDMI to DVI cable and go back to trusty DVI for the Dell's

How is your DP attached? Mine goes through a mini DP adapter first... Could that be causing problems?

I'm starting to think perhaps the Dell's are at fault... maybe that is why they didn't come with a DP cable! wink.gif

Also its not always the same Dell monitor that starts flickering! And also it is never both...

Thanks for your help so far!
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post #9 of 40
Yeah I'm using the mini-DP as well (card only has the mini ports). I honestly don't know how the adapters work, but don't see how they could cause this issue..

The only other test I can think of would be to remove the DVI monitor and see if the two DP's still bug out. Not sure what that would tell you exactly though. Hopefully you can just slap the Dells back on DVI and put the third on a HDMI to DVI, and forget about the issue.
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post #10 of 40
Thread Starter 
Quote:
Originally Posted by Crazy9000 View Post

Yeah I'm using the mini-DP as well (card only has the mini ports). I honestly don't know how the adapters work, but don't see how they could cause this issue..
The only other test I can think of would be to remove the DVI monitor and see if the two DP's still bug out. Not sure what that would tell you exactly though. Hopefully you can just slap the Dells back on DVI and put the third on a HDMI to DVI, and forget about the issue.

Looks like that is what I'm going to have to do...

Yay spend more money on a HDMI to DVI cable... what a waste, I just bought two DP cables!!

Oh well...

Thanks for your help!
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Beyerdynamic DT-770 Pro 250ohm Schiit Bifrost DAC Schiit Asgard 2 HiVi Swan M50W 2.1 
CPUMotherboardRAMHard Drive
Intel Xeon E5-2620 Super Micro X9SRL-F-B 128GB 1333MHz LSI 9271-8i 
OSPowerCase
VMware ESXi 5.5 SeaSonic SS-400FL2 Fractal Define R3 
CPUMotherboardGraphicsRAM
Intel Core i5-3437U HP EliteBook Folio 9470m  Intel HD Graphics 4000  16GB DDR3 SDRAM 
Hard DriveOS
256GB SSD Windows 10 Insider Preview 
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Ol' Sandy
(28 items)
 
"Zeus"
(12 items)
 
Elite Preview
(6 items)
 
CPUMotherboardGraphicsRAM
Intel Xeon E3-1230v3 Gigabyte GA-Z97X-UD5H-BK MSI Gaming GTX 980 Kingston 32GB (4x8) 
Hard DriveHard DriveHard DriveHard Drive
Plextor PX-256M5S 256GB Samsung EVO 1TB Hitachi HDS721010CLA332 Hitachi HDS723020BLA642 
Hard DriveHard DriveHard DriveOptical Drive
Hitachi HDS723020BLA642 Hitachi HUA722010CLA330 WDC WD10EARS-00Z5B1 TSSTcorp CDDVDW SH-S223B 
CoolingCoolingOSMonitor
Phanteks PH-TC14PE with TY-140's Lamptron FCv5 (x2) Windows 8 Pro 64-bit Dell U2412M 
MonitorMonitorMonitorKeyboard
Dell U2412M Dell U2212HM Dell U2713HM Topre Realforce 87UB | Ducky DK9087 G2 Pro 
PowerCaseMouseMouse Pad
Corsair AX-750 Corsair Obsidian 650D Logitech G700 XTRAC Ripper XXL 
AudioAudioAudioAudio
Beyerdynamic DT-770 Pro 250ohm Schiit Bifrost DAC Schiit Asgard 2 HiVi Swan M50W 2.1 
CPUMotherboardRAMHard Drive
Intel Xeon E5-2620 Super Micro X9SRL-F-B 128GB 1333MHz LSI 9271-8i 
OSPowerCase
VMware ESXi 5.5 SeaSonic SS-400FL2 Fractal Define R3 
CPUMotherboardGraphicsRAM
Intel Core i5-3437U HP EliteBook Folio 9470m  Intel HD Graphics 4000  16GB DDR3 SDRAM 
Hard DriveOS
256GB SSD Windows 10 Insider Preview 
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