[CentOS] Intel Displayport on Centos 7

Sat Jan 31 21:15:05 UTC 2015
Valeri Galtsev <galtsev at kicp.uchicago.edu>

On Sat, January 31, 2015 1:19 pm, John R Pierce wrote:
> On 1/31/2015 10:34 AM, Valeri Galtsev wrote:
>> I see that single link DVI supports up to WQUXGA (3,840 × 2,400) @ 17 Hz
>> (164 MHz) whereas dual link DVI supports up to WQUXGA (3,840 × 2,400) @
>> 33
>> Hz with GTF blanking (2 × 159 MHz)
> those numbers seem wrong to me.   nothing I've ever seen uses 17hz or
> 33hz refresh, its all pretty much 60Hz in LCD flat panel land.
> single link DVI goes up to 1920x1200 in practice, and dual link up to
> 2560x1600.   so-called '4K', really 3840x2160, requires DisplayPort, or
> HDMI 2.0  (1.4 supports 4K at 30Hz only).
> there's actually something like 5 possible DVI combinations. DVI-D is
> digital only (no analog/VGA output).  DVI-A is analog only (really just
> VGA with a different connector, I've never seen this in the real
> world).  DVI-I is both analog and digital in parallel on the same
> connector.    either of the digital formats can be single or dual link.

Not in a course of argument, but just to mention. The modes that I cited
are from the DVI standard restrictions (basically driven by data troughput
restriction) taken verbatrim from wikipedia:


I only took the mode with highest X*Y resolution hence having smallest
refresh frequency. In the reference above all modes are listed including
practical ones (with refresh rates 60 and 30 Hz).

I screwed up about one thing though: I called DVI-D "dual link" whereas
DVI-D stands for "digital only" both single or dual link, there doesn't
seem to be special designation for dual link...

As far as what particular card can/will support, it all depends on the
chip it uses (and may also for the same chip depend on board design).

I hope, this clears it all. And my apologies if my original message caused
any confusion.


Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247