kilian at diezotts
Jul 17, 2012, 7:32 AM
Post #7 of 9
You could compare the frame rate, but an analog signal cant be compared to
Re: Re: Running a USB graphics cards with Linux?
[In reply to]
a digital signal ^^
if you resolute your analog voltage in 8 bit (256 steps each subpixel, so
24bit color depth) you get some offset on the transmission
so you could not use an analog interface in order to transmit data (there
would only trash arrive)!
and there is no error correction either.
next thing is that the usb interface is not between the screen and the
graphics card but between the mainboard and the graphics card
there is no video transmission at this place!
it would be more sensible to compare usb to pci-e or agp.
2012/7/17 <frares [at] gmail>
> Em , Kilian Zott <kilian [at] diezotts> escreveu:
> > thats a strange comparison since usb is a serial busvga is not even
> digital, so how can you talk about throughput? lol
> > 2012/7/16 Michael Mol mikemol [at] gmail>
> > On Sun, Jul 15, 2012 at 6:54 PM, Sebastian Pipping sping [at] gentoo>
> > > Hi there,
> > >
> > >
> > > On 02/15/2012 09:14 PM, gk wrote:
> > >> Hallo
> > >> I used one some time ago, and it worked but very slow.
> > >> The label only says made in China.
> > >> lsusb output is:
> > >> Bus 001 Device 004: ID 0711:0900 Magic Control Technology Corp. SVGA
> > >> The Kernel module which is loaded is:
> > >> sisusbvga
> > >> If your interested in the dongle and you live somewhere around
> Germany, I can
> > >> send it to you, because I don't need it anymore.
> > >
> > > I'm afraid if it's slow I do not have much real use for it. Many
> > > for the offer, though! And sorry for the ages that it took to reply.
> > >
> > Unfortunately, you're probably not going to find anything for USB
> > which _isn't_ slow. USB is a very slow bus when compared to HDMI, DVI
> > or VGA.
> > --
> > :wq
> Well, thinkig a bit, even on a non digital interface, as you have those
> vertical and horizontal frequencies for each video mode, I guess one can
> talk like "pixels per second" using some math on those numbers.