On Thu, 20 Mar 2003, Thomas Winischhofer wrote:
> Ken Marx wrote:
> > Right. Veit also pointed out this limitation. Perhaps it's
> > *doable*, but just isn't supported? [EMAIL PROTECTED]
> > claims to have it working under linux; I know I have 1600x1200
> > working on 4.2.1 (Freebsd-4.7) for both the G400/550 on a
> > the viewsonic vp230mb (at 56hz v-refresh).
>
> I have to clarify/correct my original post:
>
> Single Link is not directly limited as regards resolution, but clock
> speed. Single link cards/cables have a max clock speed of 165Mhz. All
> above this needs dual link.
>
> 165Mhz should last for up to 1920x1080-60Hz or 1280x1024-85Hz.
Thanks for clarifying. On my other G550 I have a 1600x1024 monitor on what
appears to be a single-link cable. If I switch from DVI-digital to
DVI-analog *on the monitor* the picture goes away, so I was getting
very confused.
This is [EMAIL PROTECTED] with a 108MHz clock, well under the 165MHz limit.
> > The monitor reports it's in 'digitial' in the onscreen displays.
> > Plus, I'm using a (single link) DVI/D cable. I can't
> > even force it to analog on that cable via DigitalScreen{,1,2} "False".
> > (Could it still be fooling me and doing analog somehow?)
>
> Don't think so.
>
> > I really like your point about the dual-link card/cable.
> > I may go get a dual-link cable and see if it has an effect
> > on the Iiyama au4831d.
> > (And/or if Dr.Aitchison could report on his cable?)
I have pins 123..678 in each row, ie I am missing a 2x3 block in the
middle of an 8x3. I take it this is single-link.
My clock is 162MHz, which is just within the single-link limit.
Option NoDigitalScreen makes no difference, so maybe the option is
not available without mga_hal, and I am in fact using an analog signal.
I wouldn't trust the on screen display to report the signal type - it
reports "no signal - digital port" or "no signal - analog port" when I
switch to an input with no cable connected.
> Erm, I don't think this will help. Since Matrox always and everywhere
> states that the maximum resolution is 1280x1024 the card is very
> probably a single link card. Hence, a dual link cable will not help you
> either.
I should probably stop thinking about what my G550 will do on my
SGI 1600SW+MLA. 1600x1024 seems to break all the rules.
> > Lastly, how can I know if a card is dual/single link?
>
> Good question. Card manufacturers generally don't seem to like or use
> these terms. Typically, they target on Windows users who think in
> resolutions only.
>
> > p.s. Re: Veit's question about 60hz vs 56hz: I'm sure.
> > I went and double checked: at 60Hz I get a blank screen
> > for 1600x1200 and see this in the log:
>
> Look at the dotclock. If it exceeds 165Mhz, the DVI connection very
> probably will fail to be stable.
--
Dr. Andrew C. Aitchison Computer Officer, DPMMS, Cambridge
[EMAIL PROTECTED] http://www.dpmms.cam.ac.uk/~werdna
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