Refresh Rate

shrippen · 01-11-2011, 04:28 PM

I am using this product that uses DisplayLink technology and I have a problem with it.

I have a CRT, a Sony Multiscan20se, and when I plug it directly into my PC, I do use a GeForce GTX 260, I can choose resolutions like 1280x1024 together with a refresh rate of 75 Hz. But when I plug the CRT into the above linked USB to DVI (with the help of a DVI->VGA adapter) I can't choose anything above 60 Hz for any resolution. With one exception, when I use 800x600 I can use 75 Hz. Where this exception comes from is a question for me too.

I have tried quite anything that is available in the net about forcing a gpu to show a specific screen refresh rate including editing the EDID but nothing has helped so far.

Please help!

shrippen · 02-19-2011, 05:03 PM

Yes it is true that CRT and LCD refresh rates are not that comparable but that doesn't matter for my problem. My problem is that I can't set the CRTs refresh rate any higher than 60 Hz if I choose a resolution above 800x600. But that doesn't have to do something with the ability of the CRT. When I connect it directly (not via displaylink) to my GPU I can choose 1280x1024 with a refresh rate of 75 Hz.

Saturn2888 · 02-19-2011, 05:32 PM

I see what you're saying now. You mean the same monitor on both a GPU and DisplayLink shows you different refresh rates. Which monitor is it? Which GPU is it?

It may be a limitation of the DisplayLink technology for the chip in your monitor. DisplayLink works by integrating a GPU inside of the display which decompresses the data sent from your computer over USB. It's very possible the limitation is a driver one or the GPU itself on the monitor. I'm interested to see what the DisplayLink folks have to say.

shrippen · 02-19-2011, 05:48 PM

It's an old Sony CRT - a Multiscan20se and I am using a GeForce GTX 260

Saturn2888 · 02-20-2011, 05:33 AM

Are you saying that, upon plugging in the DisplayLink monitor, the CRT's refresh rate changes to 60Hz?

shrippen · 02-20-2011, 10:35 AM

I am saying that, when I plug in the CRT into displaylink I do not have an option to choose anything higher than 60 Hz in the monitor settings - that is not the case when I plug the monitor directly into my GPU.

I can't answer your question directly because the settings will be different if I switch the crt from the gpu to the displaylink adapter - so yes it will change.

Saturn2888 · 02-21-2011, 04:45 AM

You should note that you're using a USB to VGA adapter. Only now do I know that. DisplayLink is a technology, not a product.

shrippen · 02-21-2011, 12:03 PM

Oh, i'm sorry I usually provide all necessary information. Haven't thought of it... sorry!

You are right I use a USB to DVI adapter with an attached DVI to VGA adapater and then comes the CRT.

Saturn2888 · 02-21-2011, 04:15 PM

Seems like that's an issue right there. I wonder, which product are you using?

shrippen · 02-21-2011, 04:56 PM

It's one of those Winstar products.

01-11-2011, 04:28 PM	#1
shrippen Junior Member Join Date: Jan 2011 Posts: 8	Refresh Rate I am using this product that uses DisplayLink technology and I have a problem with it. I have a CRT, a Sony Multiscan20se, and when I plug it directly into my PC, I do use a GeForce GTX 260, I can choose resolutions like 1280x1024 together with a refresh rate of 75 Hz. But when I plug the CRT into the above linked USB to DVI (with the help of a DVI->VGA adapter) I can't choose anything above 60 Hz for any resolution. With one exception, when I use 800x600 I can use 75 Hz. Where this exception comes from is a question for me too. I have tried quite anything that is available in the net about forcing a gpu to show a specific screen refresh rate including editing the EDID but nothing has helped so far. Please help! Last edited by shrippen; 02-22-2011 at 11:51 PM.

02-19-2011, 05:03 PM	#2
shrippen Junior Member Join Date: Jan 2011 Posts: 8	Yes it is true that CRT and LCD refresh rates are not that comparable but that doesn't matter for my problem. My problem is that I can't set the CRTs refresh rate any higher than 60 Hz if I choose a resolution above 800x600. But that doesn't have to do something with the ability of the CRT. When I connect it directly (not via displaylink) to my GPU I can choose 1280x1024 with a refresh rate of 75 Hz.

02-19-2011, 05:32 PM	#3
Saturn2888 Member Join Date: Oct 2010 Posts: 58	I see what you're saying now. You mean the same monitor on both a GPU and DisplayLink shows you different refresh rates. Which monitor is it? Which GPU is it? It may be a limitation of the DisplayLink technology for the chip in your monitor. DisplayLink works by integrating a GPU inside of the display which decompresses the data sent from your computer over USB. It's very possible the limitation is a driver one or the GPU itself on the monitor. I'm interested to see what the DisplayLink folks have to say.

02-19-2011, 05:48 PM	#4
shrippen Junior Member Join Date: Jan 2011 Posts: 8	It's an old Sony CRT - a Multiscan20se and I am using a GeForce GTX 260

02-20-2011, 05:33 AM	#5
Saturn2888 Member Join Date: Oct 2010 Posts: 58	Are you saying that, upon plugging in the DisplayLink monitor, the CRT's refresh rate changes to 60Hz?

02-20-2011, 10:35 AM	#6
shrippen Junior Member Join Date: Jan 2011 Posts: 8	I am saying that, when I plug in the CRT into displaylink I do not have an option to choose anything higher than 60 Hz in the monitor settings - that is not the case when I plug the monitor directly into my GPU. I can't answer your question directly because the settings will be different if I switch the crt from the gpu to the displaylink adapter - so yes it will change.

02-21-2011, 04:45 AM	#7
Saturn2888 Member Join Date: Oct 2010 Posts: 58	You should note that you're using a USB to VGA adapter. Only now do I know that. DisplayLink is a technology, not a product.

02-21-2011, 12:03 PM	#8
shrippen Junior Member Join Date: Jan 2011 Posts: 8	Oh, i'm sorry I usually provide all necessary information. Haven't thought of it... sorry! You are right I use a USB to DVI adapter with an attached DVI to VGA adapater and then comes the CRT.

02-21-2011, 04:15 PM	#9
Saturn2888 Member Join Date: Oct 2010 Posts: 58	Seems like that's an issue right there. I wonder, which product are you using?

02-21-2011, 04:56 PM	#10
shrippen Junior Member Join Date: Jan 2011 Posts: 8	It's one of those Winstar products.