Using Dual Head, how to get rid of "sync" line.

[jeepman]

I have two Micron 17" monitors set up next to each other. Is there a way to prevent the monitors from bleeding the "sync" signal into each other? There is a noticable line that scans down one monitor, and scan up on the other monitor.

I hope to keep them as close together because I use NT 4.0 WS so I only can span the desktop, not actually create a seperate one. We use a proprietary app, so waiting for Win 2K is not an option either.

Thanks.

[Maggi]

Hi Jeepman,

do the interferences disapear when you extend the distance between your monitors ?

also you could try to do some shielding tests with metallic plates - at least one is in your oven ...
- and see if that does any changes.

If that doesn't help at all, you should check your powercords ... plug 'em all in one direction into the power socket.

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Cheerio,
Maggi

Home rig:
Celeron333A @ 500MHz
Asus P2B-S @ 100MHz FSB
2x 128MB CAS2 SDRAM
Matrox G400 @ 150/200MHz core/mem clock
... and some other goodies ...

[Haig]

Does this also happen in clone mode?

Haig

[IceStorm]

I've twin 19" Mitsubishi Diamond Pro 900u monitors, placed right next to each other, powered by my G400 MAX on the left head, and either the G400 MAX on the right head, or a Millennium II (depends on what is switched in on my OmniCube).

I do not experience the line problem. My main head (left) runs at 85hz verticle refresh. The second head (right) runs at 75hz refresh.

I do get a "shimmy" in the right head, but that's about it. It varies with the weather, it seems.

Last time I got the traveling lines you speak of, I had a composite RGB monitor next to a 12" monochrome VGA monitor.

Only way to get rid of the interferrence permanently is to completely shield one monitor from the other (don't forget the back, where the electron guns are located), or get two flat panel LCD displays.



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Primary System: PIII-540 (450@4.5x120), Soyo 6BA+ III, 4x128MB PC100 ECC SDRAM CAS2, G400 MAX in multi-monitor mode. V2 SLI rig. Two Mitsubishi Diamond Pro 900u monitors, 3Com 3C905, SoundBlaster Live!, DeskTop Theater DTT2500 DIGITAL Speaker System (Sweeeeeet!), WD AC41800 18GB HD, WD AC310100 10GB HD, Toshiba SD-M1212 6x DVD-ROM, HP 8100i CD-RW, Epson Stylus Pro, OptiUPS PowerES 650, MS SideWinder Precision Pro USB joystick, Logitech 3-button mouse, Mitsumi keyboard, Win98 SE, Belkin OmniCube 4-port KVM, 10/100 5-port Linksys Ethernet switch (30~40MB/min under Win98SE), Epson 1200u scanner.

Secondary System: PII-266, Asus P2B BIOS 1008, 1x128MB PC100 ECC SDRAM CAS2, Millennium II, 3Com 3C590, ADSL Modem 640kbit down/90kbit up, 3Com 3C509, Mylex BT-930 SCSI card, Seagate 2GB Hawk, NEC 6x CD-ROM, Linux distro S.u.S.E. 6.1 (IP Masquerade works!), Sharp JX-9400 LJ-II compatible

Tertiary System: DFI G568IPC Intel 430HX chipset, P200MMX, 4x64MB EDO Parity RAM, Millennium II, Intel Pro/100+ client NIC, SoundBlaster 16 MCD, Fujitsu 3.5GB HD, WD 1.2GB HD, Creative Dxr3 DVD decoder card, Hitachi GD-2500 6x DVD-ROM, Win98 SE

All specs subject to change.

[jeepman]

Thank you Haig,

In Clone mode, the scan line is NOT there. What is the signifigance, and does this lead to another suggestion?

Thanks,

Darryl

[This message has been edited by jeepman (edited 10 November 1999).]

[Haig]

Hi Darryl,

What happens when you move the monitors apart?

If you still these lines when they are moved apart from each other, what happens if you assign different refresh rates ie: 75hz for vga1 and 90hz for vga2?

Haig


Haig

[jeepman]

Thanks again Haig!

Setting the monitors to different refresh rates did the trick. I will swap the monitors now because the 2nd (less used) monitor is set to 85Hz, and the 1st monitor is 75Hz, but hey, that is my problem...

Darryl

Now if I just knew who to contact for developers pricing so we could test the Marvel G400 with our AGP BIOS code so we don't have a repeat of the original Millenium G200 aperature size issue... ;>)