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kOrny Jul 20, 2009, 10:09pm EDT Reply - Quote - Report Abuse
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I have 2 identical 17" acer monitors connected to my HD4670 (using VGA to DVI adapters). When ever I seem to open internet explorer, send an instant message, drag a window over, etc, the 2nd monitor will flicker. Anyone with a similar problem/know what causes this? I've updated to the latest drivers and both monitors are set to 1280 x 1024 @ 75 hertz.


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Jules Jul 21, 2009, 05:56am EDT Reply - Quote - Report Abuse
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>> Re: Dual monitor setup - 2nd monitor flickering
Why have you got 75Hz refresh rate?
In the refresh rate section tick to check 'hide modes that this monitor can not display", and then set both monitors to 60Hz

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Only read the manual as a last resort.
kOrny Jul 21, 2009, 04:24pm EDT Reply - Quote - Report Abuse
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>> Re: Dual monitor setup - 2nd monitor flickering
Thanks for your reply.

I did what you said (the check boxes were already checked). I lowered both to 60 hertz, but the problem is still there.

I noticed somethign weird though. After playing L4D for abotu an hour or 2 the problem seemed to be fixed. After my next reboot however, the flickering returned.

Jules Jul 22, 2009, 05:31am EDT Reply - Quote - Report Abuse
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>> Re: Dual monitor setup - 2nd monitor flickering
Is the flickering always on the same monitor.
Try each monitor singly (to test if its the actual monitor istelf)
The try swappling the adaptors you are using.

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Only read the manual as a last resort.
kOrny Aug 09, 2009, 05:47pm EDT Reply - Quote - Report Abuse
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>> Re: Dual monitor setup - 2nd monitor flickering
It only flickers on the screen that is being cloned/extended on. I tried every cable/adaptor combonation, as well as a 3rd screen. It only flickers when I open a program, switch to a program, send a message, open a new window, etc. It is prob just my video card not being able to handle more than 1 display that well. I've gotten used to it though. :/

Jules Aug 13, 2009, 05:33am EDT Reply - Quote - Report Abuse
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>> Re: Dual monitor setup - 2nd monitor flickering
I'm now wondering if it has something to do with the DVI-I on the card.
Your card has one DVI and one VGA - correct.
I am presuming that your monitors only have VGA input, and that you are using a DVI - vga adapter to connect the second monitor.

I have noticed that if in the monitor settings the monitor is set to receive VGA , and you plug in a DVI connection that it will automatically flick over to the DVI - with a bit of a flicker?

I wonder what would happen if you had a monitor with a DVI imput to connect to the DVI on the card without using the DVI to VGA adapter.

Maybee others on the forum can chip in with their ideas.

Anyhow, why do you want to have dual monitors when you are gaming.\?


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Only read the manual as a last resort.
Micke Olofsson Oct 19, 2009, 05:59am EDT Reply - Quote - Report Abuse
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>> Re: Dual monitor setup - 2nd monitor flickering
I have the exact same problem as you with a flickering second display and I have gone through the same procedure as you to try to find the fault, of course, without success.

But today I managed to get rid of the flickering just by unchecking "Enable ATI Overdrive" in Catalyst Control Center.

I have a Radeon HD4850 and I'm using Catalyst 9.9 and Windows Vista Business 32-bit OS.

kOrny Oct 23, 2009, 12:21pm EDT Reply - Quote - Report Abuse
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>> Re: Dual monitor setup - 2nd monitor flickering
Dang I wish I knew that back then. Good to know now I guess. I hated that flickering it drove me nuts.

Everything works perfect in Windows 7 though, no problems.

binar Oct 28, 2009, 06:14pm EDT Reply - Quote - Report Abuse
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>> Re: Dual monitor setup - 2nd monitor flickering
k0rny said:
I have 2 identical 17" acer monitors connected to my HD4670 (using VGA to DVI adapters). When ever I seem to open internet explorer, send an instant message, drag a window over, etc, the 2nd monitor will flicker. Anyone with a similar problem/know what causes this? I've updated to the latest drivers and both monitors are set to 1280 x 1024 @ 75 hertz.



I had a similar problem with my four 28" monitor setup. I tracked the problem down to bad RAM.

Cody Sammons Nov 14, 2009, 02:01pm EST Reply - Quote - Report Abuse
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>> Re: Dual monitor setup - 2nd monitor flickering
Confirmed. 5770 here and i disabled Overdrive... and the flickering was cured.

Salman h Dec 07, 2009, 01:17am EST Reply - Quote - Report Abuse
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>> Re: Dual monitor setup - 2nd monitor flickering
I got exactly the same problem! Got HD4550 VGA card, with two similar 20inch LCDs using D-Sub connector.(1600*900 resolution) One's directly connected to the D-Sub port and the other one uses a DVI-to-D-Sub adaptor.
The extended LCD flickers on any major move I do on the main screen! I wonder if my VGA card is OK anyways.

I did any possible modification on the Catalyst software, the latest version 9.11, none any permanet effect.

Any help? or had to return the VGA card to the supplier?

AMD X4 620 / M3A785GXH/128M / 2*2GB DDR3 (1333) / 2*20" AOC Monitor / Windows 7 Ultimate
~Vel Dec 07, 2009, 01:23am EST Reply - Quote - Report Abuse
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>> Re: Dual monitor setup - 2nd monitor flickering
Did you try unchecking ATi Overdrive as others suggested?

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kOrny Dec 07, 2009, 03:26pm EST Reply - Quote - Report Abuse
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>> Re: Dual monitor setup - 2nd monitor flickering
Salman h said:
I got exactly the same problem! Got HD4550 VGA card, with two similar 20inch LCDs using D-Sub connector.(1600*900 resolution) One's directly connected to the D-Sub port and the other one uses a DVI-to-D-Sub adaptor.
The extended LCD flickers on any major move I do on the main screen! I wonder if my VGA card is OK anyways.

I did any possible modification on the Catalyst software, the latest version 9.11, none any permanet effect.

Any help? or had to return the VGA card to the supplier?

I dont think its the card. I had the problem in XP but it worked itself out when I switched to Windows 7. Idk if it was the drivers or the OS itself. Are you using XP? Try updating the drivers too (if you havent already).

Salman h Dec 08, 2009, 05:07am EST Reply - Quote - Report Abuse
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>> Re: Dual monitor setup - 2nd monitor flickering
I'm using Windows 7...sure I did upgrade the software...don't want to go back to XP, it sucks comparing to 7....

Anyways, I just returned the card to the supplier, fortunately he's nice guy and accepted my problem with the card. now using my on-board VGA.soon will go for a greater card, something like HD5750. Hassle free but a lot more costly...Hope it doesn't give me any trouble..

AMD X4 620 / M3A785GXH/128M / 2*2GB DDR3 (1333) / 2*20" AOC Monitor / Windows 7 Ultimate
<a class= Dec 08, 2009, 01:45pm EST Reply - Quote - Report Abuse
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>> Re: Dual monitor setup - 2nd monitor flickering
We had a similar problem at work when hooking up a screen to a laptop and after extending the desktop it would flicker. Replacing the videocard fixed it.

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scott bennett Apr 09, 2011, 08:18am EDT Reply - Quote - Report Abuse
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>> Re: Dual monitor setup - 2nd monitor flickering
mine did the same thing running windows 7 pro 64 bit with a radeon hd 5750 and the 2nd monitor would flicker if i did anything on the main monitor, after reading about disableing the amd overdrive, i did that and the flickering is now gone, so now i know if you overclock your card then you can only run a single monitor.

shameem 007 Jun 23, 2011, 02:13am EDT Reply - Quote - Report Abuse
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>> Re: Dual monitor setup - 2nd monitor flickering
Is the flickering always on the same monitor.
Try each monitor singly (to test if its the actual monitor istelf)
The try swappling the adaptors you are using.

http://decorativeironwallart.com/blog/
Bob Bob Jul 07, 2011, 05:06pm EDT Reply - Quote - Report Abuse
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>> Re: Dual monitor setup - 2nd monitor flickering
I had the same Problem with flickering:

Setup: Dual Monitor
- 32PFL8404 Phillips TV connected via VGA (flickering)
- Samsung LW227 via DVI (not flickering)
- Radeon HD 4850 with Catalyst 11.6

Problem:
- Overcklocking (Thanks to the guy who mentioned the overclocking issue.)

Solved:
- Deactivate AMD Overdrive (Catalyst Control Center - Performace Tab)
I didn't overcklock myself but the new CCC 11.6 did by default.

I even registered to share, cause im really happy this is solved now.

Bob



jamie busch Jul 20, 2011, 05:41pm EDT Reply - Quote - Report Abuse
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>> Re: Dual monitor setup - 2nd monitor flickering
Bob Bob said:
I had the same Problem with flickering:

Setup: Dual Monitor
- 32PFL8404 Phillips TV connected via VGA (flickering)
- Samsung LW227 via DVI (not flickering)
- Radeon HD 4850 with Catalyst 11.6

Problem:
- Overcklocking (Thanks to the guy who mentioned the overclocking issue.)

Solved:
- Deactivate AMD Overdrive (Catalyst Control Center - Performace Tab)
I didn't overcklock myself but the new CCC 11.6 did by default.

I even registered to share, cause im really happy this is solved now.

Bob




Likewise I registered to share this same solution.

Either monitor was flickering very annoyingly, and I thought that maybe my new monitor was junk. Once I read the suggestion about disabling the AMD overdrive the problem immediately went away. I am using a Radeon 5770 video card with catalyst 11.6 drivers.

Thank you for the assistance of this thread. :_)


kOrny Jul 21, 2011, 05:00pm EDT Reply - Quote - Report Abuse
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>> Re: Dual monitor setup - 2nd monitor flickering
THANKS!!!

2 YEARS LATER!!! LOL

Jeff Andrus Nov 30, 2011, 01:01am EST Reply - Quote - Report Abuse
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>> Re: Dual monitor setup - 2nd monitor flickering
I have the 6770 and had the same problem Un-clicking the Graphics overdrive fixed it THANKS


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