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Eyefinity Ubuntu Lucid

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  • rohcQaH
    replied
    Originally posted by koshcu View Post
    It sure has been hard actually getting information from amd or any of the vendors about these cards or what works with them.
    you did see this page?
    http://support.amd.com/us/eyefinity/...y-dongles.aspx

    first google hit for "amd displayport adapters".

    Originally posted by koshcu View Post
    For such a nice card it seems like the choice of outputs really screws things up.
    yeah, thankfully all the competition has a whopping two outputs! Why can't ATI do better? Stupid ATI

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  • koshcu
    replied
    The problem with that is that I have no devices that use displayport. So the only way I have to test if one of those works is to actually get the card. It sure has been hard actually getting information from amd or any of the vendors about these cards or what works with them.

    They make a card with 6 mini-displayport interfaces which is pretty much not used anywhere. If they had 6 mini-hdmi or mini-dvi then it would have been trivial to make this stuff work with any monitor out there. If they had done 6 mini dp+ instead of 4 mini dp and 2 dp+ then this would also not be a problem since you could use 6 passive hdmi/dvi adapters.

    For such a nice card it seems like the choice of outputs really screws things up. I went and looked through the active displayport to dvi/hdmi adaptors and it seems like most of them overheat and shut off after a while. Lots of problems where reported for darn near all of them. Based on the forums the VGA ones where a little complex to get windows to recognize the right monitor resolution on the ones that didn't send the EDID information. However I have run into those issues on windows before and on linux it was never an issue since I just put the resolution in the config file. So from everything I read the VGA ones are more reliable in actually working but knowing for sure that they work is so hard to actually find the information on.

    I could get two passive mini-displayport to hdmi and two active mini-displayport to hdmi and the active ones will cost about $100 each but it seems like they are even more likely to have problems. I could also replace all 4 of my monitors with newer displayport interface monitors but to get PVA or better panel quality would run about $500-$800 each and that is pretty silly considering the current monitors work flawlessly just not with the port that amd chose which almost no monitors support. I know that TN panels are cheaper but I don't consider a TN panel an option.

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  • rohcQaH
    replied
    Originally posted by fluxion View Post
    1) To use Eyefinity you need to have at least 1 "native" displayport device, this can be a monitor with displayport, or native adapter.
    no, the limitation is "maximum of two outputs with DVI/HDMI or VGA signals". Those formats require another bit of hardware for each output, and ATI didn't want to include 6 of those.

    I don't know if those VGA adapters are active, but I haven't heard about tunneling VGA over DP, either. Buying one to test before spending bucks on GPU + 4 adapters might be wise. That way you'll also see if their VGA signal is as good as you like it.

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  • koshcu
    replied
    If you look up http://www.google.com/search?sourcei...+to+vga+active From what I could see on widescreengaming, stores sites and others the vga adapters are all active.

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  • koshcu
    replied
    Hmm from what I read online all VGA adapters are active. The dvi/hdmi adapters that look like that are passive though. However because the VGA signal is analog and not digital and the cards don't output analog all analog adapters have to change the signal.

    At least on various sites I have looked at they have said that all the vga adapters are active ones.

    Leave a comment:


  • fluxion
    replied
    Originally posted by koshcu View Post
    From what I can see these (http://www.amazon.com/gp/product/B00...A3V6BK4D0HKA8F) mini-displayport to vga adapters should work.
    thanks for the changelog info...got me pretty excited but well i started looking for an adapter i found, surprisingly, that the stuff i heard from a dude at Fry's regarding displayport was accurate:

    1) To use Eyefinity you need to have at least 1 "native" displayport device, this can be a monitor with displayport, or native adapter.
    2) The cheaper adapters, like the ones you posted, are actually "passive" adapters, and I guess cause ATI cards to use their standard VGA/DVI hardware rather than the 3rd displayport one.
    3) The only "native" adapter out there i've seen so far is $100 http://www.amazon.com/Accell-UltraAV...ref=pd_sim_e_3

    So for us frugal folks I think eyefinity only makes sense if we have a displayport monitor, or a REASONABLY priced active adapter comes along.

    Seems to me AMD/ATI is using eyefinity to push displayport adoption, since their eyefinity 6 cards can push a signal over a non-active adapter for the first 4 devices without any issues (or so i've read, in this forum i think).

    fortunately ATI supports xrandr and i can toggle between 2 secondary displays with a keyboard shortcut, which works for me since my 3rd output is just a TV i use to watch videos and whatnot.

    Leave a comment:


  • koshcu
    replied
    It does seem strange but I have 4 Westinghouse L2410NM which are PVA screens. I get no moire patterns or any other distortion switching back and forth between hdmi input and vga input. I have even done stuff like just switching the monitor back and forth between the two inputs with the same desktop up on both inputs and could not see any difference at all in images, text etc.

    I know those adapters say they are for apple stuff on that page but I did some searching around and people where using them with eyefinity cards also without problems apparently. There are some short stuby ones that are displayport to vga that people have some problems with but overall work. The mini displayport one though that I gave a link to is supposed to work much better since it hands over all the EDID information among other things.

    Leave a comment:


  • rohcQaH
    replied
    Originally posted by koshcu View Post
    Active dvi/hdmi connectors are $100 but active vga connectors are $10 and the quality output between hdmi and vga seems to be identical.
    I really doubt that. Have you tried displaying high-contrast images or grid patterns? With VGA, there's often ghosting and moire patterns. Especially at high resolutions, the VGA interface wasn't really meant for those bandwidths.

    At least that is my experience with a recent (~1.5 years old) 1920x1200 TFT monitor. 1024x768 works fine, but at 1920x1200 the image gets really ugly.


    There's also something about apple adapters, from what I heard they depend on some specific capabilities of the GPU only found in apple products, i.e. they don't work anywhere else. Not sure though, I never tried.



    You're right about eyefinity: no server-side Xinerama, acceleration across all monitors without trouble. If eyefinity is fully supported, that is - I haven't used more than 2 monitors so far.


    There's only two solution to have >=3 monitors without Xinerama: get a card with enough outputs (eyefinity) or get a matrox triplehead2go (you could call it a dvi splitter).

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  • koshcu
    replied
    xrandr still does not support mutli-gpu objects which is needed to turn them all into a single screen. So even with nouveau you have to deal with xinerama to make a 4 screen setup or at least that is my understanding of it. So that might make some 2D stuff faster but I would still have xinerama bugs to deal with..

    The quadro cards that can run 4 1920x1200 monitors in a 4x1 setup where very expensive last I checked. They also are FAR too loud and hot. The 5000 series ati card are quieter and far lower power usage.

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  • Kano
    replied
    Maybe you want to try nouveau then? Nvidia directly supports what you want only with the expensive Quadro series.

    Leave a comment:

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