Re: I love USB displays!

Bernd Paysan <bernd.paysan@xxxxxx> writes:
Anton Ertl wrote:
[3840x2400]
Apart
from Windows, a problem of such monitors is how to drive them. You
need two dual-link DVI ports, and I found it already pretty
challenging to get hardware and software to work for my 2560x1600
display.

Fortunately, there's now DisplayPort 1.2; with four lanes, it can drive
4k by 2560.

But which graphics card has that and can do that? Sounds to me like
reliving the dual-link DVI experience: First having to find a card
that supports dual-link DVI, and then one that also supports the whole
resolution; I have a Radeon X850XT at home that has two dual-link DVI
connectors, but supports only up to 2048x1536. Also, of the two
graphics cards I bought after my 30" monitor (which has DisplayPort
among other connectors), none has DisplayPort.

The 30" screens are particularly challenging to drive, because they
usually have no scaler inside, so you have to get everything right to
drive them.

Do you mean "scaler" as in blowing the picture up to full screen? My
Dell 3008WFP can scale, and some of the things it does are quite
impressive: I have a picture of picture-by-picture mode (two computers
displaying on the same monitor, each getting a 1280x1600 half-screen),
with one half being driven in 1920x1440 scaled down to 1280x960. The
result was still surprisingly readable.

I also have the impression that some graphics cards (in particular, an
Nvidia 8600 based card I tried) scale the picture in the graphics
card: Even when I asked the monitor for 1:1 display (which worked as
intended with other graphics cards), I got a scaled-up image from
lower-resolution modes.

- anton
--
M. Anton Ertl Some things have to be seen to be believed
anton@xxxxxxxxxxxxxxxxxxxxxxxxxx Most things have to be believed to be seen
http://www.complang.tuwien.ac.at/anton/home.html
.

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