Re: [gentoo-user] Running a USB graphics cards with Linux?

2012-07-17 Thread Kilian Zott
thats a strange comparison since usb is a serial bus
vga is not even digital, so how can you talk about throughput? lol


2012/7/16 Michael Mol mike...@gmail.com

 On Sun, Jul 15, 2012 at 6:54 PM, Sebastian Pipping sp...@gentoo.org
 wrote:
  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
 Adapter
  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 thanks
  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




Re: Re: [gentoo-user] Running a USB graphics cards with Linux?

2012-07-17 Thread Kilian Zott
You could compare the frame rate, but an analog signal cant be compared 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 fra...@gmail.com

 Em , Kilian Zott kil...@diezotts.de 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 mike...@gmail.com
 
  On Sun, Jul 15, 2012 at 6:54 PM, Sebastian Pipping sp...@gentoo.org
 wrote:
 
   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
 Adapter
   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
 thanks
   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.

 Francisco