AMD displayport problem?

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///AMG

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So I've had display port issues since well a while back when I was still using my 7970 and I always thought it was my Dell U2711 so and ended up using a DVI-D instead and called it a day. Well when I got my 290s I kept the same set up, but recently I got a LG 34UM95 Ultrawide and Display port has been a pain in the ass so I used HDMI, but the monitor doesnt have HDMI 2.0 which I just realized so it cant do 60hz at native res. So I thought it was the monitor but decided to check my 7970 and it does the same thing as my 290.

Next thing was I went to bestbuy to buy a GTX 970 and display port works fine. I am super curious now if both of my 290s and my 7970 have some issue where only display port doesnt work or something and its my cards or AMD specific problem?

I dont know if I want to keep this monitor anymore, might as well just get a Samsung 4k TV now since I already bought a GTX 970, while I am at it might as well order a GTX 980 Ti.

tl:dr
2x 290s and one 7970 has issue with display port but nothing else is wrong with them, used 2 different DP cables, tried both monitors, can now isolate it to the cards themselves.

AMD problem or my 3 cards?
 
what exactly is the problem with DisplayPort? What is it doing exactly in other words?
 
It is a common problem with cheap DisplayPort cables. You need to choose a certified DisplayPort cable off this list that is less than 3m long. Click on the box labeled cables and hit search.

I am a cheap ass from birth. I bought some HP cable and it kinda worked at 60Hz, but as soon as I tossed my monitor into 120Hz it would lose signal. Do you know how annoying that shit is when your monitor is 6 feet away from you and the case is even further? The only cure for me was to unplug the monitor and plug it back up. It blinked out literally every time that a game hit 120Hz or I used VSR.

So I went back and purchased another cheap Cable Matters cable and now it only blinks out sometimes when the monitor comes out of sleep. Then Robert Hallock from AMD linked the list of certified cables on Twitter. I'll probably grab an Accell cable after Christmas and see if it cures the wake up issue. He said that for 1440p a certified cable is a must.

Hope that helps. And this cures those experiencing the issue with Nvidia cards also according to a buddy.
 
cageymaru said:
It is a common problem with cheap DisplayPort cables. You need to choose a certified DisplayPort cable off this list that is less than 3m long. Click on the box labeled cables and hit search.

I am a cheap ass from birth. I bought some HP cable and it kinda worked at 60Hz, but as soon as I tossed my monitor into 120Hz it would lose signal. Do you know how annoying that shit is when your monitor is 6 feet away from you and the case is even further? The only cure for me was to unplug the monitor and plug it back up. It blinked out literally every time that a game hit 120Hz or I used VSR.

So I went back and purchased another cheap Cable Matters cable and now it only blinks out sometimes when the monitor comes out of sleep. Then Robert Hallock from AMD linked the list of certified cables on Twitter. I'll probably grab an Accell cable after Christmas and see if it cures the wake up issue. He said that for 1440p a certified cable is a must.

Hope that helps. And this cures those experiencing the issue with Nvidia cards also according to a buddy.
Click to expand...

Hm, I wonder if Dell and LG have just been giving me uncertified cables with their monitors. I will buy one and see, thanks.

JustReason said:
what exactly is the problem with DisplayPort? What is it doing exactly in other words?
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Both monitors keep flashing on and off, or sometimes I will wake the computer up and the monitor will turn on then go completely blank, or every few seconds they will turn on and off.
 
cageymaru said:
It is a common problem with cheap DisplayPort cables. You need to choose a certified DisplayPort cable off this list that is less than 3m long. Click on the box labeled cables and hit search.

I am a cheap ass from birth. I bought some HP cable and it kinda worked at 60Hz, but as soon as I tossed my monitor into 120Hz it would lose signal. Do you know how annoying that shit is when your monitor is 6 feet away from you and the case is even further? The only cure for me was to unplug the monitor and plug it back up. It blinked out literally every time that a game hit 120Hz or I used VSR.

So I went back and purchased another cheap Cable Matters cable and now it only blinks out sometimes when the monitor comes out of sleep. Then Robert Hallock from AMD linked the list of certified cables on Twitter. I'll probably grab an Accell cable after Christmas and see if it cures the wake up issue. He said that for 1440p a certified cable is a must.

Hope that helps. And this cures those experiencing the issue with Nvidia cards also according to a buddy.
Click to expand...

With what you just explained, I am definitely happy that my Samsung 28 inch 4k monitor included a Display port cable in the box. So far, it worked fine with an R9 290x and a 980 Ti. Hope this information helps OP.
 
ManofGod said:
With what you just explained, I am definitely happy that my Samsung 28 inch 4k monitor included a Display port cable in the box. So far, it worked fine with an R9 290x and a 980 Ti. Hope this information helps OP.
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I used the ones that came with my Dell U2711 and my LG 34UM95, both have the same issues on my amd cards. Just not on the GTX 970 so far.
 
That does sound like an amd driver issue. A few others and myself had flickering problems when mixing displayport with other connections (look for the flickering thread in the amd section). Any chance you can take some video of the phenomena?
 
Darakian said:
That does sound like an amd driver issue. A few others and myself had flickering problems when mixing displayport with other connections (look for the flickering thread in the amd section). Any chance you can take some video of the phenomena?
Click to expand...

Ill have to reinstall my 290 and see if it does it again. Ill try the clean driver utility that was posted earlier.
 
So I got the new cable and installed it. No problems at first, then started to use it to play games, problems popped up again. I check everything and the DP cable is extremely hot, its the only one that is actually in the way of the vents on my reference R9 290s. When it cools down again no problems, looks like heat is the issue not the cables themselves. So I am using HDMI right now but I can only get 8 bpc instead of 10 bpc on hdmi. No issues with the GTX 970.

Also can only get 50hz refresh rate on HDMI, I can get 60hz on DP.

EDIT: Typed controller instead of the cable
 
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Huh, perhaps the displayport controller is over heating? File a bug with AMD anyway as it maybe be software, but I wonder if a small heatsink on a chip would solve it.
 
Darakian said:
Huh, perhaps the displayport controller is over heating? File a bug with AMD anyway as it maybe be software, but I wonder if a small heatsink on a chip would solve it.
Click to expand...

Yea, I'll do that. I think just a bad engineering oversight.
 
///AMG said:
Reference design, XFX. Also have a Powercolor reference design one as well both exhibit same issue.
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You have some other issue man..The odds of BOTH cards have a randomly overheating displayport controller is just No. The fact that you are saying you can only get 50hz over HDMI with the other card tells me what I already suspect. The issue is between the keyboard and chair;)...
 
ccityinstaller said:
You have some other issue man..The odds of BOTH cards have a randomly overheating displayport controller is just No. The fact that you are saying you can only get 50hz over HDMI with the other card tells me what I already suspect. The issue is between the keyboard and chair;)...
Click to expand...

I said HDMI only gives me 50hz, while displayport gives me 60hz and 10bpc, found out recently because the monitor only support hdmi 1.4a and hdmi 1.4a seems to only support up to 4k at 30hz so thats why the monitor only does 50hz on HDMI. (sorry if I didnt state that clearly)

I never said it randomly overheated the controller (I meant to type cable instead of the controller but thats my fault I edited that post), the displayport connector is located where there are vent openings on the end of the card where as the DVI are not. Thus it seems the exhaust vents the air to the cable itself and makes it extremely hot. I NEVER SAID one card gives me 50hz on one 290 and not the other, both my 290s are reference so they have the exact same design. I just said that the GTX 970 doesnt have any issues with the displayport cable getting hot from the exhaust vents because the exhaust never even gets that hot.

I don't really appreciate the insult or your sarcasm. You aren't coming in to help so I would like it if you refrain from posting.
 
ccityinstaller said:
The odds of BOTH cards have a randomly overheating displayport controller is just No.
Click to expand...

The overheating display port controller is just speculation on my part. I offered it up because I thought it might be within the realm of possibility, not because I was sure in any way about it being the issue.

Also, if both cards are reference designs and the reference design does not properly cool the display port controller (or maybe some other component) then the odds of both having the same issue is quite high.
 
I would PM XFXSupport on the forums here and ask him directly. He might have some insight as to why the DisplayPort is acting up or get your cards fixed. Make sure that you tag this thread in your PM so that he can know exactly what the symptoms are.
 
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Having same issue as OP. Unfortunately I bought a crappy cable matters cable which is even worse. Constant flickering. I have an Accell cable on order which hopefully will fix things.

It got so bad, my pc would lockup within a few minutes of playing GPU intensive games. Going to hdmi fixed that, but atm stuck at 50hz. No HDMI 2.0 on my 290x.
 
I have had my Accell cable for a week now and still have the same issues on the 290s but not on my 7970. Have no issues at all on the GTX 970, probably going to return it though since it doesnt have enough power to run most of the new games at 3440x1440, looking at getting a 980Ti and be done with it,
 
Sufu said:
Having same issue as OP. Unfortunately I bought a crappy cable matters cable which is even worse. Constant flickering. I have an Accell cable on order which hopefully will fix things.

It got so bad, my pc would lockup within a few minutes of playing GPU intensive games. Going to hdmi fixed that, but atm stuck at 50hz. No HDMI 2.0 on my 290x.
Click to expand...

I had a HP branded cable and every time that I fired up a game the signal going to the monitor would cut off. I would literally have to unplug and plug the cable back in for 30 - 46 minutes to get a signal. I thought that something was wrong with my video card. Then I switched my monitor to 60Hz operation and it seemed to work, but every so often it would do it again. It was so bad that I couldn't even see the damn bios. To be exact I almost bought a new motherboard because my PC wouldn't even boot with that cable. To boot my PC I literally had to unplug the DisPlayport cable, then plug it back in when I thought Windows was up.

That Cable Matters crap would drop signals when my monitor wakes up. That wasn't too bad, but it got annoying trying to run back into my room to move my mouse before it went to sleep. I bought a 90 degree Silverstone case just to unplug the damn DisPlayport cable and because let's face it; it's a damn cool looking case.

Got the Accell cable in and all is well. :) I wish it fixed AMG's issues. That 980ti will be a beast upgrade for him though.
 
Finally got the out of range message again. I had to open Twitch and leave it open. Then let the PC go into sleep mode with Twitch on my second monitor. A livestream had ended while I was cooking and it did it immediately after that.

@AMG. Think Flash acceleration is messing with the cards? It didn't do it until then whereas before the new cable it was a crapshoot if the monitor will wake up. One thing that annoys me to no end is that if I enable Sleep for the monitors on the PC; they will go to sleep if I leave a game idle and in WIndowed Borderless. Kinda annoying me. A lot.

Of course if I disable the monitors going to sleep everything is peachy. But I don't want them glaring at me as I will wake up and read messages in the middle of the night. I have a sleeping disorder and that adds to it. ;)
 
cageymaru said:
Well you could try the AMD utility that geforce_man kindly linked in another thread to make sure it's not the new drivers causing an issue. New software always causes new bugs. ;)

http://support.amd.com/en-us/kb-articles/Pages/AMD-Clean-Uninstall-Utility.aspx
Click to expand...

This tool is used, when a user can't uninstall AMD software by regular OS means. It has nothing to do with DP1.2 port performance, since graphics cards don't control signal carrier chipsets like HDMI or DP chips. They only control codes transmitted by the signal.
 
RGB source is always 4:4:4, full or limited. But it can be auto downsampled by some TV monitors to YCbCr 4:2:2 by default, as they assume video source in non-PC Mode, and Game signal source in PC Mode. If that's your case, check your monitor on-screen menu to switch off such behavior, or look for its firmware mods. At 3440x1440 RGB 8bpc settings, you can set 55Hz in 290x AMD CC with CVT Reduced or Manual Timings (same as for 30Hz defaults) requiring 292.5Mhz bandwidth, while HDMI1.4a is limited to 297MHz real bandwidth plus some overhead towards 340MHz max.
 
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zamaracrillio said:
RGB source is always 4:4:4, full or limited. But it can be auto downsampled by some TV monitors to YCbCr 4:2:2 by default, as they assume video source in non-PC Mode, and Game signal source in PC Mode. If that's your case, check your monitor on-screen menu to switch off such behavior, or look for its firmware mods. At 3440x1440 RGB 8bpc settings, you can set 55Hz in 290x AMD CC with CVT Reduced or Manual Timings (same as for 30Hz defaults) requiring 292.5Mhz bandwidth, while HDMI1.4a is limited to 297MHz real bandwidth plus some overhead towards 340MHz max.
Click to expand...

I'm using a Dell U3415w, under the color menu of my monitor I can select "RGB" or YPbPr". On my PC, I'm using RGB full, which I guess is 4:4:4 like you said.

I don't think 55hz is worth the trouble. My monitor CAN do HDMI 2.0, but my video card cannot. If the new DP cable coming today doesn't fix the issue, I'll start hunting for a DP to HDMI 2.0 adapter to see if that fixes the flickering. I had an Asus PQ321q before this, and sometimes on bootup only half the screen would turn on, on top of the instability issues. Rebooting always fixed the screen issue. I've always assumed it was due to buggy drivers and DP MST not playing nice.
 
You can save and load this test image in an Image Viewer (not web browser) at 100% zoom with no desktop, monitor and GPU scaling to see what chroma you're getting on screen, take a photo (not screenshot). But 55Hz may be worse "the trouble", although the adapter may serve good when coupled with high quality cable. :)
 
zamaracrillio said:
You can save and load this test image in an Image Viewer (not web browser) at 100% zoom with no desktop, monitor and GPU scaling to see what chroma you're getting on screen, take a photo (not screenshot). But 55Hz may be worse "the trouble", although the adapter may serve good when coupled with high quality cable. :)
Click to expand...

I got my new Accell DP port cable, and so far so good. It has only been a few minutes, but that's all it took with the other cables to see flickering (screen would go black for second or two and then recover).

Right now I'm at 3440x1440@60hz. Need to try gaming on it now.
 
Sufu said:
I got my new Accell DP port cable, and so far so good. It has only been a few minutes, but that's all it took with the other cables to see flickering (screen would go black for second or two and then recover).

Right now I'm at 3440x1440@60hz. Need to try gaming on it now.
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Spoke too soon. Started gaming and instantly the monitor starts flickering on and off - even the monitor menu disappears when it does this. Maybe I have a bad monitor?
 
Sufu said:
Spoke too soon. Started gaming and instantly the monitor starts flickering on and off - even the monitor menu disappears when it does this. Maybe I have a bad monitor?
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I see you have the same issue as I do. Its not the monitor, I see this issue on both my LG 34UM95 and my Dell U2711 when I start gaming after a few minutes is starts flickering. But only ever happens on DP, and only on my 290s. Like I keep theorizing check your DP cable connector when you play your games feel how hot it is after a few minutes, literally burns your hand touching it. Thats the only difference I see when I play games and when I dont, so I figured that must be the issue because the DP cable doesnt get anywhere near that hot on my 7970 and GTX 970.
 
///AMG said:
I see you have the same issue as I do. Its not the monitor, I see this issue on both my LG 34UM95 and my Dell U2711 when I start gaming after a few minutes is starts flickering. But only ever happens on DP, and only on my 290s. Like I keep theorizing check your DP cable connector when you play your games feel how hot it is after a few minutes, literally burns your hand touching it. Thats the only difference I see when I play games and when I dont, so I figured that must be the issue because the DP cable doesnt get anywhere near that hot on my 7970 and GTX 970.
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I found an post on a forum saying that it's the DP chipset in these monitors that can't handle DP 1.2 at high resolutions. I turned off DP 1.2 (so downgrade to DP 1.1) in the monitor menu - initially it seems ok but I have not thoroughly tested it. You might want to give that a shot.

All else fails, I've had my eye on two EVGA 980 Ti cards.
 
Sufu said:
I found an post on a forum saying that it's the DP chipset in these monitors that can't handle DP 1.2 at high resolutions. I turned off DP 1.2 (so downgrade to DP 1.1) in the monitor menu - initially it seems ok but I have not thoroughly tested it. You might want to give that a shot.

All else fails, I've had my eye on two EVGA 980 Ti cards.
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I dont have DP 1.2 enabled on my LG 34UM95, and my U2711 doesnt even support it so I dont think that was the issue. But yea I am moving to the 980 Ti, it will be my first nvidia card in over a decade.
 
I have a 3m accell cable, and I get the same thing. But I've found that, however strange it this seems, that it's tied, in some way, to core voltage.

I thought initially that it was tied to core clock, but through trial and error I've found that the same speed, but with lower voltage, significantly reduces the number of instances (one every game session, vs continuously when a game is running)

I've had to drop my clock speeds, can only get 1100@ +10mv, vs 1200 @ +100mv, but it works.

I skimmed the thread to see if you mentioned any overclocking, but I didn't see anything.
 
TurboGLH said:
I have a 3m accell cable, and I get the same thing. But I've found that, however strange it this seems, that it's tied, in some way, to core voltage.

I thought initially that it was tied to core clock, but through trial and error I've found that the same speed, but with lower voltage, significantly reduces the number of instances (one every game session, vs continuously when a game is running)

I've had to drop my clock speeds, can only get 1100@ +10mv, vs 1200 @ +100mv, but it works.

I skimmed the thread to see if you mentioned any overclocking, but I didn't see anything.
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I personally have everything stock, my cards are also reference so as far I know everything is stock. I am running the latest crimson drivers as well.
 
Well mine did it once since I got the new cable and it's been smooth sailing every since. Beats a few times a day that I was getting before. Hopefully my 4K TV will be in this coming week. If I get my Club3D adapter in at the same time I'll let you'll know how it runs.
 
cageymaru said:
Well mine did it once since I got the new cable and it's been smooth sailing every since. Beats a few times a day that I was getting before. Hopefully my 4K TV will be in this coming week. If I get my Club3D adapter in at the same time I'll let you'll know how it runs.
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I think I may have a temporary solution. I used MSI's afterburner and cranked the fan to 45% to keep the card under 70c because apparently default doesnt go above 35% fan speed, and the crimson driver sucks because I cant find anywhere to change the fan settings. The DP connector part of the cable is a lot less hot and worked for 2 games of LoL. Ill have to try other more demanding games to see how it goes.
 
///AMG said:
I think I may have a temporary solution. I used MSI's afterburner and cranked the fan to 45% to keep the card under 70c because apparently default doesnt go above 35% fan speed, and the crimson driver sucks because I cant find anywhere to change the fan settings. The DP connector part of the cable is a lot less hot and worked for 2 games of LoL. Ill have to try other more demanding games to see how it goes.
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Good to hear. Both of my 290X are under water, but the black screen issue would happen at stock speeds. These are reference MSI cards. I've been running all day with DP 1.2 disabled in the monitor's menu, and everything seems to be working OK as far as screen issues are concerned.

I think my CPU OC has not been stable, because my system locked up earlier today with the new Accell DP cable, so I don't think the cable was at fault for system instability. But at least the flickering went away so happy on that area.
 
///AMG said:
I think I may have a temporary solution. I used MSI's afterburner and cranked the fan to 45% to keep the card under 70c because apparently default doesnt go above 35% fan speed, and the crimson driver sucks because I cant find anywhere to change the fan settings. The DP connector part of the cable is a lot less hot and worked for 2 games of LoL. Ill have to try other more demanding games to see how it goes.
Click to expand...

All of those early cards had a mandatory bios update that raised the minimum fan speed to 40% I think. I'd have to Google it for the exact number. The cards throttle hard otherwise and overheat. The default fan speed for my card is 20%. At 20% it would run at 725 on the core. With the fans set to 40% it stayed locked at 1050 overclocked. At 20% if I set it to 1050 on the core the best I would get is around 900 after I switched to this Silverstone case.
 
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