So, who has gotten a 191T to work in DVI...

[V Green]

under XP?

What video card did you use?
ATI 9600 SE currently in use here.

I can't for the life of me get this to work,
it's one of the most hair-pulling hardware issues
I've ever run across.

POST and startup screens on DVI OK, goes blank
and 191 into power save at logon screen.

If I uninstall the ATI driver, and just use the
castrated "VGA Compatible", I can get 1024x768
on DVI but no higher. Using ATI drivers, only 640x480x16
in "Enable VGA mode" only.

I'm aware of the 191T having bogus EDID and ID'ing
itself as a 531T on the DVI connector. Surely there
must be a way around this issue.

Analog VGA OK at all resolutions.

 

[Jerry]

I've been using my 191T on a Radeon 9600 Pro's DVI connector for at least a
year and have not had any problems. I'm running the latest Catalyst drivers,
version 4.7

I also use it's analog connector to view another system that has a Radeon
9000 in it and that's been ok too.

 

[V Green]

I've been using my 191T on a Radeon 9600 Pro's DVI connector for at least a
year and have not had any problems. I'm running the latest Catalyst drivers,
version 4.7

I also use it's analog connector to view another system that has a Radeon
9000 in it and that's been ok too.

Thanks for responding Jerry.

Did you install Samsung's monitor "driver" or did you
just let XP call it a "Plug n Play Monitor"?

Samsung tech support claims that's all I need to do...

Did you use the DVI cable that came with it or something else?

 

[Jerry]

I used the DVI cable that came with the monitor and it's running at 1280 x
1024.

I downloaded the Samsung drivers and used them after XP was installed
successfully. Device Manger/Monitor lists the driver as a Samsung version
1.0

Tonight I swapped out the Radeon 9600 Pro for a Radeon 9800 Pro w/256Mb of
RAM and XP started just fine but with generic VGA drivers. Did a driver
update from Device Manager and everything is as it should be.

 

[V Green]

I used the DVI cable that came with the monitor and it's running at 1280 x
1024.

I downloaded the Samsung drivers and used them after XP was installed
successfully. Device Manger/Monitor lists the driver as a Samsung version
1.0

Tonight I swapped out the Radeon 9600 Pro for a Radeon 9800 Pro w/256Mb of
RAM and XP started just fine but with generic VGA drivers. Did a driver
update from Device Manager and everything is as it should be.

I have a 9600 SE. Mayber it's too castrated to do DVI properly...
9800 is a little outta my price range, but if it's the only way to get
this to work....

 

[Jerry]

Before the 9800 Pro I was using a 9600 Pro w/128Mb of memory just fine.

ATI is selling the 9800Pro w/256Mb of memory on their web site for $299 with
free shipping.

 

[V Green]

Jerry, if you're still following this-

I bought a 9800 Pro /128 to try-it acts exactly the same,
so it's likely NOT the video card. I also don't think
it's the monitor per se, as I can get it up to 1024x768
with the built-in VGA driver in XP.

This leaves a couple of things-some versions of the 191T
(like mine) misidentify themselves as a Samsung 530TFT
due to a EDID bug. I suspect the Cat drivers are reading
this info (1024x768) and overriding everything I'm trying to do to get
the DVI port up to 1280 x 1024.

Or, for some reason, I have a bad DVI cable, but I find
this to be unlikely, as it works up to 1024x768@60. Only thing I
can think of here is that the Samsung supplied cable is single-link,
and that a dual-link cable, although theoretically NOT necessary
(191T bandwidth 135 Mhz per spec sheet), it may make a
difference.

If you don't mind, I have a few registry entries I'd like to compare
with you. If interested, we can take this off the NG - email me
at

vancegrn@no_spam.covad.net

(remove the obvious)

or, if you think others may benefit, we can leave it here.

Thanks.