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  • bridgman
    replied
    Originally posted by mugginz View Post
    I'm lead to believe that you need the dongle for more than two DVI monitors. I need to drive three 1920x1200 screens via DVI. Two DVI and one Display-port is doable without the dongle though.

    If you have better info though I hope you're right.
    My understanding is that you definitely need a dongle, but that you don't always need an active dongle (the passive ones are a lot cheaper). Alex's post goes into some of the active/passive details.

    I just discovered that we maintain a list of validated dongles :

    http://support.amd.com/us/eyefinity/...y-dongles.aspx

    There has been some discussion related to firmware updates for some of the dongles; not sure what the firmware does on a dongle but apparently said firmware needs to be very current for good results

    Leave a comment:


  • mirv
    replied
    Originally posted by mugginz View Post
    At first glance it would seem that e17 might not be what I'm after in an environment. The second test box should be back tomorrow so will throw it on that. I prefer a bare metal install for things where an initial impression is important. What distro would you suggest for said install?
    I use Gentoo - kind of can't keep away from it - but I think on all systems E17 takes a little bit to setup. Unofficial packages exist for most of the common package managers.

    ATI stable where nVidia isn't? Not a very common outcome there.
    Probably not, but there you have it. Different people get different experiences.

    Leave a comment:


  • monraaf
    replied
    Originally posted by Panix View Post
    You tell me.

    Checking distrowatch, Debian, Ubuntu and Mandriva, for examples, seem to agree that X-Server 1.7.5 is stable. Can there still be problems? I don't know. What is their definition of stable?
    Latest Debian stable is Lenny: xorg-server 1.4.2
    Latest Ubuntu stable is Karmic: xorg-server 1.6.4
    Latest Mandriva stable is 2010.0: xorg-server 1.6.5

    Leave a comment:


  • bridgman
    replied
    Of the three distros you listed, only Ubuntu is on the "official support" list and the latest release (Karmic) uses 1.6.4 according to distrowatch (my system is 1.6.3, thought it was up to date ???).

    The references to 1.7.5 are for development builds of Lucid, which has not yet been released.

    Leave a comment:


  • Panix
    replied
    Originally posted by bridgman View Post
    None of the distros we support use X-Server 1.7, do they ? Would it be more correct to say that your complaint is "we don't officially support all distros with fglrx (some are open source driver only right now), and on some of those unsupported distros there is a problem with X-Server 1.7" ?
    You tell me.

    Checking distrowatch, Debian, Ubuntu and Mandriva, for examples, seem to agree that X-Server 1.7.5 is stable. Can there still be problems? I don't know. What is their definition of stable?

    Leave a comment:


  • agd5f
    replied
    Originally posted by rohcQaH View Post
    wait, multiple DP screens? That's limited to the 6-DP-Eyefinity edition, isn't it?
    It depends what connectors the OEMs put on their boards. Generally, most seem to be 1 DP and several non-DP outputs for a total of 3 possible independent screens, but you could in theory design a board with more 2 or more DP outputs and some combination of non-DP ports for between 2 and 6 independent screens. However, as you add more possible simultaneous screens, you need more memory bandwidth, so that needs to be taken into account when designing the board. A lot of current boards have 2 dual-link DVI ports, an HDMI port, and a DP port. That combination uses all the possible outputs, so you'd have to give up one of those to add another DP port.

    The hardware has 2 PLLs, 6 crtcs, 2 DACs, and 6 digital transmitters (which can be used for LVDS/TMDS/DP/eDP/HDMI). DP runs at a fixed clock, so you don't need a separate PLL for it. That gives you some combination of up to 2 non-DP outputs, and up to 6 DP outputs for a maximum of 6 possible independent screens. Dual-link DVI ports require 2 digital transmitters (one for each link), so a dual-link DVI port would use 2 of the 6 possible transmitters, leaving 4 for other digital outputs. Two dual-link DVI ports would use 4 digital transmitters which would leave 2 for other digital outputs.

    DP only requires 1 transmitter. So in order to use a dual-link DVI monitor on a DP port, you need an active converter since native dual-link is not possible due to the lack of a second transmitter when running in DVI pass-through mode.

    Leave a comment:


  • rohcQaH
    replied
    Originally posted by bridgman View Post
    Is one of the three monitors connected via display port ? The HD5xxx cards have many CRTCs but only have two independent pixel clock generators, so you can have up to two conventional screens plus additional display port screens.
    right, ignore my last post.

    My situation is a bit more complex: I have two monitors (both DVI) and a projector (HDMI). I don't need the projector when using the monitors and vice versa, so two outputs at a time would be plenty.

    Unfortunately fglrx seems to permanently disable DFP4 (dvi#2) when it detects a cable in DFP2 (hdmi), no matter if there's actually a picture on DFP2 or not. To use the second monitor, I have to unplug the projector before the system boots (though thankfully that can be done at the projector, I don't have to switch cables under my desk any more).

    I'm hoping this configuration will magically start working once eyefinity is officially supported. If it doesn't, I'll wait for the OS drivers and (try to ) make it work.
    In any case, it's just a minor inconvenience, nothing I'd consider buying a >50? DP-adapter for.

    Originally posted by bridgman View Post
    so you can have up to two conventional screens plus additional display port screens.
    wait, multiple DP screens? That's limited to the 6-DP-Eyefinity edition, isn't it?

    Leave a comment:


  • mugginz
    replied
    Originally posted by bridgman View Post
    I got the impression that active dongles were only needed for the higher resolutions (ie dual-link territory). Don't take that as gospel though...
    I'm lead to believe that you need the dongle for more than two DVI monitors. I need to drive three 1920x1200 screens via DVI. Two DVI and one Display-port is doable without the dongle though.

    If you have better info though I hope you're right.

    Leave a comment:


  • bridgman
    replied
    I got the impression that active dongles were only needed for the higher resolutions (ie dual-link territory). Don't take that as gospel though...

    Leave a comment:


  • mugginz
    replied
    Originally posted by bridgman View Post
    Is one of the three monitors connected via display port ? The HD5xxx cards have many CRTCs but only have two independent pixel clock generators, so you can have up to two conventional screens plus additional display port screens.
    Indeed. I unfortunately would need to acquire an active dongle in order to support my third screen when Eyefinity comes to Linux. US$100 is a bit steep though. Would probably rather put that $100 towards a six port Eyefinity card though if it meant I didn't need the active dongle for three screens.

    Leave a comment:

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