anyone get "displayport link failure" in sleep mode?

brianmanahan

Lifer
Sep 2, 2006
24,506
5,912
136
both my monitors worked perfectly on a 6950 with 2 DVI ports. my new 7950 has only 1 DVI, so i had to use DVI for 1 monitor and mini-displayport for the other.

about 5 times now in the past few days, the monitor on displayport will NOT come back on after it shuts off in sleep mode, or even blank screensaver mode. if i unplug/plug in the displayport a couple times, the stupid thing might reset! and if it does come back on, i get a message about how there was a "displayport link failure".

anyone ever seen something like this? any idea on how to fix?

in the meantime im going to try picking up a cheap hdmi cable and see if that'll run 1440p and avoid this issue.
 

blackened23

Diamond Member
Jul 26, 2011
8,548
2
0
HDMI will not do 1440p. DVI-DL will work for you though... As far as DP, i've seen this issue on many cards and monitors, some cables are just finicky. I was able to pick up a DP 1.2 cable a while back that is free of such issues, though.
 

KingFatty

Diamond Member
Dec 29, 2010
3,034
1
81
Yes, I get the same error sometimes, not sure exactly the factors.

But never happened in Win 7; are you using Win 8 too? I seem to get it in Win 8 every now and then after sleeping/waking certain number of times or some pattern maybe?
 

CakeMonster

Golden Member
Nov 22, 2012
1,580
757
136
I've had the same problem since I got my 7970 and had to use DP. That's just what you get for using two 1440p+ monitors (u2711 and u3011 in my case).

I have to leave the DP monitor on 24/7 to avoid my desktop resetting and all my programs ending up on monitor #1. I'm sure its wearing out that monitor but there's just no alternative. There was a long thread on the Dell forums where their representatives repeatedly avoided admitting the DP issue even though the issue is DP and not Dell. There was also a thread on [H] but its been more than one year so I can't find them right now, I will update the thread if I do.

Basically, DP is crap for this simple reason regardless of whatever other advantages it has. This cancels out everything. I refuse to believe that I'm the only person that is annoyed if every window is reset and put on monitor #1 when leaving the computer or turning off the monitor.
 

brianmanahan

Lifer
Sep 2, 2006
24,506
5,912
136
OH! i can just avoid displayport completely:

DVI to DVI for the big monitor
HDMI to VGA for the small monitor

yep, will probably do that.

sad that displayport + amd is such a pain
 

KingFatty

Diamond Member
Dec 29, 2010
3,034
1
81
For me, there was no issue at all, displayport worked fine under Windows 7.

Only when I installed Windows 8 did I start seeing the issue. It's a very strange issue too, where I get some kind of error message. Even when I re-enable the display, it's stuck at 800x600 for some odd reason and I have to try all kinds of things to get it back to native?

Again, never happened in Win 7, so I'm hoping it's an issue with drivers interacting with Win 8, so maybe we'll see a software fix soon (either by AMD or by Microsoft)?
 

3DVagabond

Lifer
Aug 10, 2009
11,951
204
106
interesting... if i still have the problem in a week, i will probably try this belkin cable with pin 20 disabled:

http://www.amazon.com/Belkin-F2CD000...pr_product_top

edit: ugh, but i dont know if that supports 2560x1440!

should have just gotten the sapphire 7950 with 2 DVI ports D:

You've been told what you need to do.

Key factors is that if it is 32AWG it must be below two meters in length and #20 PWR Pin must not be active.

THis^^^

If you don't listen, you'll just frustrate yourself to no end and continue blaming AMD when it's not their issue.
 

brianmanahan

Lifer
Sep 2, 2006
24,506
5,912
136
You've been told what you need to do.

THis^^^

If you don't listen, you'll just frustrate yourself to no end and continue blaming AMD when it's not their issue.

i guess you didnt see the post after that one, where i plan to avoid this stupid displayport thing altogether

will just use DVI and HDMI
 

Schmide

Diamond Member
Mar 7, 2002
5,622
811
126
Ironically I get display port errors at cold boots, sleep works fine. Just have to unplug/replug it when it happens.
 

KingFatty

Diamond Member
Dec 29, 2010
3,034
1
81
To clarify, referring to "sleep" - does that mean the PC waking from a sleep mode? Or does it refer to the monitor doing dark to power save itself?

I have issues with the former, the PC goes to sleep, and when I wake it, sometimes, unpredictably, the displayport can get confused.

But I'm not using a displayport cable, and getting a different displayport cable wouldn't help me.

Instead, I'm using an active single-link ~$30 displayport-DVI adapter. But about that pin issue with a displayport cable, wouldn't that issue appear whether you had Win 7 or Win 8? The fact that I get my issue only in Win 8 gives me hope that it's not hardware.

Otherwise, would making a special "disabler" extension cord work? E.g., get a displayport M-F extension cord, and disconnect pin #20 in the extension cord, and use that? I'm not sure if disconnect means an open circuit, setting it to a certain voltage, and/or grounding that pin?
 

CakeMonster

Golden Member
Nov 22, 2012
1,580
757
136
To clarify, referring to "sleep" - does that mean the PC waking from a sleep mode? Or does it refer to the monitor doing dark to power save itself?

I have issues with the former, the PC goes to sleep, and when I wake it, sometimes, unpredictably, the displayport can get confused.

But I'm not using a displayport cable, and getting a different displayport cable wouldn't help me.

Instead, I'm using an active single-link ~$30 displayport-DVI adapter. But about that pin issue with a displayport cable, wouldn't that issue appear whether you had Win 7 or Win 8? The fact that I get my issue only in Win 8 gives me hope that it's not hardware.

It means the power save function. Or just turning off the monitor connected with DP (or DP->DVI active adapter). That's why I have to leave that monitor on 24/7 to avoid it resetting and messing up my desktop. Dell is refusing to address the issue and suggesting idiotic things like disconnecting and reconnecting the monitor... which uhm.. still means my desktop is messed up and adds extra work on top of it. DP simply causes Windows to reset my desktop to whatever the default display is if I turn off that monitor or let it go into power save (and yup, of course also reset if I physically disconnect it).

You WILL get this issue if both your monitors are 1440p resolution or higher and your graphics card doesn't have two Dual Link DVI. AMD does not, one of the DVI ports is only Single Link. I don't know about NVidia.

It's been this way in Win7 for a year since I got my 7970 regardless of driver version. DP is just fundamentally broken but I have no choice since both my monitors need Dual Link DVI or DP and only one of this card's DVI ports are DL.

http://en.community.dell.com/support-forums/peripherals/f/3529/t/19339056.aspx
 
Last edited:

mjkrie

Junior Member
Feb 18, 2013
1
0
0
are 1440p resolution or higher and your graphics card doesn't have two Dual Link DVI. AMD does not, one of the DVI ports is only Single Link. I don't know about NVidia.

It's been this way in Win7 for a year since I got my 7970 regardless of driver version. DP is just fundamentally broken but I have no choice since both my monitors need Dual Link DVI or DP and only one of this card's DVI ports are DL.

http://en.community.dell.com/support-forums/peripherals/f/3529/t/19339056.aspx

I have/had the same problem, but because I wanted to pass also sound to the display (Asus PB278Q)

Soon after getting tired of reset windows, I started using HDMI, which works ok with my HD7850. My card version has DP, HDMI, DVI-D(DL?), DVI-I(SL?) and it says HDMI 1.4 should support resolution up to 4k standard.
 

contrails

Junior Member
Jan 10, 2014
3
0
0
I am having DP link failure error,
I have visiotek 900614 Radeon HD 7750

http://www.newegg.com/Product/Produc...140109212436:s

powering 4 AOC 29-inch IPS Q2963PM monitors

http://www.amazon.com/gp/product/B00...=eauciuen0a-20

connected through generic mini DP to DP cable
http://www.amazon.com/gp/product/B00...=eauciuen0a-20

Do you think if I upgrade the cable to mini DP to DP 1.2 this issue will be resloved?

I am looking at this cable


http://www.amazon.com/gp/product/B00...=eauciuen0a-20

Many thanks for your input
 

contrails

Junior Member
Jan 10, 2014
3
0
0
Get a card with 2x DL-DVI. Either NVidia, or AMD 29*.

I tried a different card but even with best active adapters I had crashes and this visiontek solved the crashes part but this DP link failure pops up every now and then.

I am thinking the cable is the problem
 

CakeMonster

Golden Member
Nov 22, 2012
1,580
757
136
DP is the problem unfortunately. You will lose link unless you disable power save mode and leave your monitors turned on.
 

KingFatty

Diamond Member
Dec 29, 2010
3,034
1
81
Guys, just check whether pin 20 is being fed with voltage.

A proper cable will *NOT* pass the voltage.

A cheap cable *WILL* pass the voltage and things will get screwy. Just use a voltmeter and confirm that pin 20 is zero when everything is on/connected.
 

contrails

Junior Member
Jan 10, 2014
3
0
0
Guys, just check whether pin 20 is being fed with voltage.

A proper cable will *NOT* pass the voltage.

A cheap cable *WILL* pass the voltage and things will get screwy. Just use a voltmeter and confirm that pin 20 is zero when everything is on/connected.

can you recommend a miniDP to DP cable that has that criteria please?
 

KingFatty

Diamond Member
Dec 29, 2010
3,034
1
81
Here are a list of cables that have been tested by VESA to pass the DP standards (see more info here http://www.displayport.org/products-database/, select the "Cables" box, and search):


SEARCH RESULTS
Show entriesSearch:
PRODUCT NAME COMPANY NAME CATEGORY
CAC-DP20BK 2M ELECOM Cables
DP 10 ft. Male to Male Belkin Cables
DP to DP 1M Amphenol Cables
DP to DP 2M Amphenol Cables
DP to DP 2M with Latches Molex Cables
DP to DP 3M Amphenol Cables
DP to DP 3M with Latches Molex Cables
DP2DVIMM10 StarTech.com Cables
DP2DVIMM6 StarTech.com Cables
DPCAMM-0.5 L-com Cables
DPCAMM-1 L-com Cables
DPCAMM-10 L-com Cables
DPCAMM-2 L-com Cables
DPCAMM-3 L-com Cables
DPCAMM-5 L-com Cables
PP200 2M EIZO Cables
UltraAV® DisplayPort to DisplayPort 10ft (3m) C... Accell Cables
UltraAV® DisplayPort to DisplayPort 6.6ft (2m)... Accell Cables
UltraAV® DisplayPort to DisplayPort Cable 1 Met... Accell Cables
UltraAV® Mini DisplayPort to DisplayPort 1.2 Ca... Accell Cables
UltraAV® Mini DisplayPort to Mini DisplayPort 6... Accell Cables