Display Port

gman

gman

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Graham
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I still occasionally get problems with my computer connecting to Display Port, I always have to turn the monitor on and leave it for about 3-5 seconds before turning the computer on. However, if you restart the computer or turn it off and restart a little later with the monitor going into sleep mode it often cannot seem to connect via the Display Port. HDMI on the other hand never fails.

I recently read somewhere that there is a capacitor in the monitor which sometimes needs to be fully discharged otherwise this can happen? Anyway, I finally decided to contact AOC about this and they replied with the following:

Please can you confirm if you have selected the PC to search for the monitor using the DP input? If you have been using HDMI input ok and have not changed the input select on the PC settings when you change to the DP, it will still search for a HDMI input.
Click to expand...

I'm not 100% sure what she means, I have the correct driver installed for the monitor and within the menu on the monitor itself it is set to DP. So I asked how to do this and received this response:

You need to set your PC to search for the monitor using the DP input. I am afraid you would need to speak with the manufacturer of your PC to obtain details on where this would be.
Click to expand...


I built the computer myself which is:

  • MSI Z77A-G45 motherboard
  • Pentium i7-3770K CPU
  • 16GB PC3-10600 RAM
  • Samsung 512GB SSD
  • Nvidia Geforce GTX 970 Jetstream
  • Windows 7 Ultimate 64bit

I can't find any information online about what she is suggesting. Does anyone know what she means and how to do this?


Cheers
 
Anyone? or is this a lost cause?
 
Maybe you will find something in your display, if you right click on your desktop?
 
•
Nowadays, monitor are no longer simple slaves but do have a full array of CPUs
to they communicate with the computer. Apparently, yours has to load some stuff
at startup before it is ready to use.
 
sounds like fob off to me.

your GPU should auto detect which connection is being used. unless you also have something plugged into the HDMI?

could just be a bad handshake on the monitor.
 
I've seen this listed a number of times as an issue, everything from a poor quality cable (link) to the power saving functions on GPU (link) disabling ULPS. This one might be relevant (but not directly related) which is get the newest bios for your GPU and latest drivers (link).
 
I've the same issue with a similar machine using an Asus PA248Q and an Nvida GTX660.
I just connected it via HDMI instead.
 
Cheers for the replies. I don't want to use HDMI because it won't support the full 4K resolution so don't have any other cable connected except the DP one which came with the monitor. I've tried different DP cables, I've got powersaving functions disabled in the graphics card settings, I've got the latest drivers installed but also tried other drivers, I've disabled powersaving within the monitor menu and also have it set to DP only and not auto detect.

I think it's definitely monitor related which is a shame as it's a great display. Reason being, if you power down the computer but don't power off the monitor and it goes into standby mode it typically won't work when you restart the computer unless you power off the monitor completely for a minute. This makes me think there's a capacitor in it which needs to fully discharge or something? (I've read somewhere online about this).

I'm also now reading that if the DP cable has the 20th pin connected then it can cause problems because it's supplying 3.3V power back to the graphics card. So could it be the cable? It's the one that came with the monitor but I'll need to wait until I can check this.


I've received the following replies from AOC which are pretty bloody useless to be honest but at least they are talking to me! lol


You need to manually select the DP input for the unit to display any image on this unit.
Click to expand...

So I asked "In the monitor menu or on the computer/OS somewhere? It's already been set like that on the monitor for a long time now"

and received the reply

This would be in the computer settings.
Click to expand...

Grrrrr. Doesn't make sense as this is happening immediately upon power up before the OS has started.


I'm thinking it could be the handshake issue and the 20th pin thing as it would explain the problem at startup, will need to check.
 
They've replied just repeating the same advice at the start in that I need to speak to my computer manufacturer. I built it from scratch so I'll have a word with myself tonight. Sigh... you would think she'd escalate it to the next level support but it sounds like they either don't know what's wrong or won't tell me because they know of a hardware flaw perhaps?

I'm going to buy a specific 19 pin DP cable to rule the handshake thing out.

Disappointed with AOC and I don't think I'll be buying any more of their products for both personal and business. :(
 
Ok, so my graphics card uses mini displayport outputs but I can't seem to find a 19 pin mini - full size dp cable? Only a full size to full size one. Was thinking about a mini to full size adapter but everything seems to be Thunderbolt, isn't that Apple?
 
Is it 19 pin though ? Doesn't seem to support full 4k :(
 
I'm going to try taping my pin 20 off first then see how that goes
 
Well I tried taping off pin 20, very difficult as everything is so small. Carefully plugged it in and powered up the monitor and got a different message along the lines of "No DP signal". Took the cable back out and the tape was gone! lol Cleaned out the port in the back of the monitor in case it had got stuck over different pins etc and couldn't get it to work again. Tried uses a different DP port on the graphics card (I have three) and it works again although pin 20 is still uncovered. Is it possible I've buggered that first port on the graphics card?

Going to just leave it until I can find a mini - full size 19 pin DP cable. Otherwise, will just switch to HDMI on a lesser resolution.

I have another DP cable which I was going to try and manually break the pin 20 but it's a full size DP cable on both ends (from when I had a lesser graphics card) so that's no good. I can't even find a mini - full size adapter so that I can buy the 19 pin DP cable from Amazon which is full size on both ends. They all seem to be DP to HMDI adapters.

Perhaps that may work? Buy the 19 pin DP cable and use the DP to HDMI adapter and plug it into the HDMI port in my graphics card? Not sure how it will effect resolution though? I think the GTX970 is HDMI2 capable?


Could be in luck :)

http://www.startech.com/uk/Cables/A...ideo-Cable-Adapter-Male-to-Female~MDP2DPMF6IN

Found it on Amazon so order it along with the 19 pin DP cable. Should arrive next week so looking forward to testing it. Hope I haven't buggered that first port on my graphics card, at least the other two are working though! lol
 
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I previously thought it may be the card so I upgraded to the GTX970. I'm certain now it's the cables but will have to wait and see.
 
Lol no worries . Your advice though has pointed me towards this 19 pin thing in the first place otherwise I'd be no further forward with all this !
 
Just another point to think about is the SSD drive. My computer was slowing a bit but i have System Mechanic and within that there is a facility to "Defragment" the card just like a normal hard drive but this is one for SSD hard drives. After i did mine the screens came up twice as fast. I am not saying System Mechanic is the only program out there but well worth doing occassionally. Yes I know the principle of how an SSD differs but you can speed things up
 
Yes you can "Defrag"SSD drives BUT you need the tool as I posted. It is designed for SSD drives only.
That link you posted Neil is for trying to do it as for a normal Disk hard drive not one for SSD drives
 
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Crucial are talking rubbish. I do wish when people like that clearly explain they are referring to normal hard drives, and not confuse them with SSD drives, which if followed yes maybe they are right. How many times do I have to say there are or is on System Mechanic a special section on doing it for SSD drives which is perfectly safe.

neil_g said:
For the benefit of anyone who doesn't know, and to quote Crucial..

"don't defrag your drive because at best it won't do anything, at worst it does nothing for your performance and you will use up write cycles [shortening the SSD lifespan] doing it"

http://forum.crucial.com/t5/Crucial-SSDs/Does-defragmenting-an-SSD-cause-any-long-term-performance-loss/ta-p/71051
Click to expand...

AS you pointed out the have not said they were referring to normal defragging which they should have done, as per a normal disk hard drive.
Neil
Have a look on System Mechanic and you will find the section I am talking about as you seem to also have that program
Unfortunately statement like that tend to mislead those who don't know the different methods of defrag depending on the drive being used. Far better they withdrew that statement or amended it to specify what they actually mean

If they had said do not defrag an SSD drive the same as a hard disk drive, then it would have been very clear to all and sundry, but in their ignorance they didn't do so.

So going by their misleading statement I have to cast a doubt on any other subject they posted about without them doing proper checks first
 
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Cheers but it's not really a speed thing but more that the screen isn't connecting at all!
 
if you believe that does anything different then i have some magic beans you may be interested in?

samsung:

Will defragmentation improve my Samsung Solid State Drive’s performance?
No, Solid State Drives do not need defragmentation because they have no moving parts and can access any location on the drive equally fast.
Please disable any defragmentation utilities on your computer because they will only wear down the performance of your SSD.
Visit the OS Optimization section of Samsung SSD Magician for help doing this.

OCZ:

Is there any required maintenance for my SSD?
No maintenance is required on OCZ SSDs, but turning off drive defragmentation is highly recommended. Defragmentation is not beneficial to SSDs and may cause unnecessary writes to the drive.

etc etc etc
 
There you go yet again, you keep harping back to defrag the hard disk drive method which should not be used. Look up System\Mechanic and find out how you can do it safely.
 
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what exactly do you think it's doing? because reading their site it goes into no detail at all.

if you have a TRIM enabled OS then no SSD maintenance is required.

you've been caught out before giving out detrimental advice, please stop.
 
Well, the cables arrived today (19 pin DP one and a Mini DP to DP Adapter M/F) and it looks like we have full success! :D

I done computer restarts, turned the monitor on and off whilst in Windows etc, all the things that would previously stop it working and it's been flawless so far. It's such a relief as I can't explain how damn frustrating it was and it always happened when you were in a rush to get the computer up and running!

So cheers to everyone for helping especially Neil as your advice led me down the 19 pin route. And FU AOC for being clueless and trying to fob me off with half arsed advice and probably just a load of b*****ks anyway. Part of me doesn't want to tell them the solution but then if I do then at least it may help others with the same problem?
 
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