Re: [gentoo-user] Running a USB graphics cards with Linux?
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?
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
Re: Re: [gentoo-user] Running a USB graphics cards with Linux?
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
Re: [gentoo-user] Running a USB graphics cards with Linux?
On Tue, Jul 17, 2012 at 10:03 AM, Kilian Zott kil...@diezotts.de wrote: thats a strange comparison since usb is a serial bus vga is not even digital, so how can you talk about throughput? lol Information doesn't need to be digital. Terms like 'bandwidth' really do apply. VGA does place some structure on its signal. You have a vertical and horizontal refresh rates. Your vertical refresh rate is usually in the 10s of Hz. I've seen displays range from 56Hz (terrible, terrible flicker on CRTs) to 120Hz (smooth as glass). Your horizontal refresh rates are usually in the 10s of *KHz*. The combination of the two dictated how many scanlines you could fit into your signal. Your number of pixels in a line was (in reality) limited by your video card's dot clock, but you might adjust things if you preferred, e.g. square pixels instead of whatever the per-pixel aspect ratio normally was. (I really don't rememeber.) Unlike DVI and HDMI, which support pixel formats that have subsampling, VGA didn't have any kind of compression mechanism. You had three channels, red, green and blue, and their voltage levels on the wire controlled the brightness of that color at whatever particular point on the display corresponded to that instant in your horizontal and vertical sweeps. If you'd like to know how I compare USB and VGA, look at ways VGA and DVI are analogous. Of course, under certain (now very unusual) circumstances, VGA can kick DVI's butt. -- :wq
Re: Re: [gentoo-user] Running a USB graphics cards with Linux?
On Tue, Jul 17, 2012 at 10:32 AM, Kilian Zott kil...@diezotts.de wrote: 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. Please stop top-posting; it's difficult to keep the conversation clear. And see my other reply to you. -- :wq
Re: [gentoo-user] Running a USB graphics cards with Linux?
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. Best, Sebastian
Re: [gentoo-user] Running a USB graphics cards with Linux?
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: [gentoo-user] Running a USB graphics cards with Linux?
Am Dienstag, 14. Februar 2012, 23:19:56 schrieb Sebastian Pipping: Hello, I would love to use two external displays with my notebook. I have seen USB graphics cards on the net and was wondering if anyone around here has tried to run such a thing with Linux. If it worked for you I'd be interested in as many details as you are willing to share. Thanks in advance! Best, Sebastian 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. greatings günter --
