Archived from groups: alt.comp.periphs.videocards.ati,alt.comp.periphs.mainboard.asus (
More info?)
In article <10imtfk88uuhj87@corp.supernews.com>, "QZ" <nothing> wrote:
> "Paul" <nospam@needed.com> wrote in message
> news:nospam-2408040623100001@192.168.1.177...
> > This posting talks about using Powerstrip, to create a custom
> > resolution for the monitor. Powerstrip is available from
> > entechtaiwan.com .
>
> > Perhaps you can create a custom entry for 1280x1024, and change the
> > Vertical Geometry settings.
>
> > I'm thinking maybe your monitor just doesn't like the default values
> > the ATI card is using, and is improperly acquiring vertical sync
> > from the card.
> >
> > If you post again, please include the brand and model number
> > of your display, so I can do some searches to see if this is
> > a known problem. For the most part, LCD displays seem to be
> > amazingly free of such problems, as I don't see complaints from
> > people about them (barring the problems of using non-native
> > resolution, of course, and getting an ugly display).
>
> I did some research on Viewsonic LCDs (my monitor is a VG191) and Radeon
> cards, and I read a few posts with different problems in Digital mode. I
> remember somebody was having a similar problem in Digital mode in Windows,
> but also in the BIOs. Apparently this isn't a good combo, you would have
> thought they would have worked out these problems by now, but maybe there is
> some kind of hardware flaw in the VG191 and other early Viewsonic Digital
> LCDs, that they can't correct with drivers.
>
> Today, I connected the LCD to Analog mode and it rebooted fine five times.
> The BIOS screen is now alway slightly cut-off, but I don't care about that.
> What I did notice is at the recommended res. of 60Hz the text was soft, at
> the next standard res. 75Hz it was ok, then at 70Hz, which the LCD doesn't
> even mention, but the card defaults to, it looked just as good as Digital to
> me.
>
> Tomorrow is the last day to get an RMA, which would give me some more time,
> but whatever the comparablt priced Nvidia card is, the 6800, IRCC, test show
> that the text isn't quite as sharp, and that is most important to me. If
> Analog mode was noticably inferior w/ATI, I would have had to decide if
> going to Nvidia to get Digital would have been better, all things
> considered, but it isn't.
>
> Since 70Hz is a custom Vertical refresh, and the problem still happens
> intermittently, I just thing this combo doesn't work correctly in Digital. I
> guess I could try increments of one, and continually reboot, but this has
> been too time-consuming as is. I will keep it in Analog mode, and reboot it
> many times between today and tommorrow, so I will know if I need an RMA or
> not.
I guess you aren't alone:
http://groups.google.com/groups?selm=RP7M9.2528%244k6.292741%40wards
If there was a widespread problem with the VG191, you would think
there would be more postings in Google. The digital connection is
a high speed signal, and needs a good cable if it is being clocked
near its limits. I don't think the protocol has any error detection,
so if the cable or signal itself was bad, I would first expect to
see "snow" on the screen, as an indication that the digital signal
was marginal.
Your problem sounds like it is related to vertical sync, and I
had hoped if you adjusted the parameters with Powerstrip, it would
settle down.
ATI knows there is a problem too
Different card.
http://ebhs-129-33-163-54.tor.usf.ibm.com/support/infobase/3993.html
Paul