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Thread: Some questions about eyefinity

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  1. #1
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    Default Some questions about eyefinity

    Hi all,

    A bit of background to begin, i currently run 2 LG W2252(1680x1050) 22" LCDs via twin-view on a 7600GT. I'm looking at upgrading my PC specifically upgrading to a ATI 6xxx card to take advantage of triple-head(I will be also purchasing another LG LCD). For software i'm running a gentoo ~amd64 system with xfce 4.7.

    I like the way twin-view works, it allows me to have a spaned display for my desktop and lets my WM know where the monitor borders are. It also allows me to turn off one of the monitors(selectively via meta-modes like 1680x1050, NULL or NULL, 1680x1050) if i need to run a game or other full screen application on just one monitor. Generally i do this in a separate X session while keeping my spaned desktop session running.

    Is eyefinity a similar technology to twin-view? Can i selectively turn monitors off to run just a single monitor for something like xbmc to run on the central screen? (An after thought was that i could possibly just use a second x configuration file that only turns on the center monitor as i almost always load xbmc into its own X session, this is messy however and i'd prefer the option to control it via xrandr or similar. even if i could just change from 5040x1050(l+c+r) to 3360x1050(l+c) to 1680x1050(c) and then smaller 4:3 resolutions on the center monitor via xrandr i'd be happy)

    I assume eyefinity allows full 3d acceleration across the whole span? So i can run ultrawide games in wine?

    Does eyefinity like twin-view let x know that it is creating a span, so that x is able to inform the WM where things like monitor borders are?

    Cheers,
    Novae

  2. #2
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    I recently swapped my Nvidia 9500GT for an Ati 4850 on my Linux workstation. To answer your questions: yes, eyefinity does what you want.

    In fact, it is superior to TwinView in most ways:
    - it supports xrandr and randr 1.3.
    - it reports correct refresh rates (Nvidia reports random rates)
    - it allows you to rotate one or more monitors into portrait mode, keeping the rest in landscape. Nvidia simply cannot do this.
    - it hotplugs new monitors as soon as you connect them. I've never managed to get Nvidia to detect a new monitor without running nvidia-config.

    I am seriously impressed! Ati's drivers have improved massively those past 12 months. VDPAU be damned, this is the first time I am actually happy with the state of graphics on Linux.

    Looking forward to the 11.1 drivers and the vsync fix.

  3. #3
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    "Eyefinity" is two things:
    * the hardware's capability of more than 2 outputs
    * some windows driver tweaks making such setups easier. Funny enough, the capabilities added were present on linux for.. decades?

    There's no special linux software for eyefinity, you use xrandr as usual. Yes, proper xrandr is superior to those twinview-hacks. Triple portrait setup <3


    Oh, don't forget that only two DVI/HDMI-connections are supported. For the third monitor, you'll have to use DisplayPort (or an active (!) DP->DVI adapter).

  4. #4
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    What you could do is test your desired setup with a cheap eyefinity card, like this one and buy the more expensive 6xxx card only when eyefinity does what you want.

  5. #5
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    Quote Originally Posted by BlackStar View Post
    eyefinity does what you want.

    In fact, it is superior to TwinView in most ways:
    - it supports xrandr and randr 1.3.
    - it reports correct refresh rates (Nvidia reports random rates)
    - it allows you to rotate one or more monitors into portrait mode, keeping the rest in landscape. Nvidia simply cannot do this.
    Nvidia can, my setup is 2560x1440 landscape plus 1200x1600 portrait on a 8800 GT.
    Works fine BUT:

    This setup is dog slow (compared to NOT running a monitor in portrait mode or Windows 7). It seems like rendering on the 90 rotated screen is completely un-accelerated.

    Will this setup work better using a 5770 or 6850?
    Which driver do I need ? Proprietary, open source or open source WIP (git)?
    (a third monitor, 1920x1200 landscape, will be connected also)

    Is there any way that compiz/KDE4 is supported?

    Frank

  6. #6
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    Quote Originally Posted by frank View Post
    Nvidia can, my setup is 2560x1440 landscape plus 1200x1600 portrait on a 8800 GT.
    Works fine BUT:

    This setup is dog slow (compared to NOT running a monitor in portrait mode or Windows 7). It seems like rendering on the 90 rotated screen is completely un-accelerated.

    Will this setup work better using a 5770 or 6850?
    Which driver do I need ? Proprietary, open source or open source WIP (git)?
    (a third monitor, 1920x1200 landscape, will be connected also)

    Is there any way that compiz/KDE4 is supported?

    Frank
    With multiple monitors, the width of the desktop is the sum of the widths of the various monitor resolutions while the height is the largest height among your various monitors resolution.

    In most cases, rotating one monitor to portrait causes the desktop size to increase.
    This increase in desktop size is what leads to the slow down that you experienced.

    With multiple monitors and the larger desktop sizes they have you will get better performance with cards that have larger RAM. With the setup you are planning on getting I would recommend a card with 2Gb.

    I'd go with the 6850 rather than the 5770. Or even better still get a 6950 2GB if its within your budget.

    For best performance with any recent ATI card the proprietary driver is what you want.

    My setup is two 1440x900 and one 1920x1080 in portrait mode running on a 6970 (this was originally a 6950 that I upgraded via a bios mod). KDE 4.5 works fine.

    Hope this helps.

  7. #7
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    Quote Originally Posted by pwyll View Post
    With multiple monitors, the width of the desktop is the sum of the widths of the various monitor resolutions while the height is the largest height among your various monitors resolution.
    sure


    Quote Originally Posted by pwyll View Post
    In most cases, rotating one monitor to portrait causes the desktop size to increase.
    This increase in desktop size is what leads to the slow down that you experienced.
    No. Handling 50% more pixels can not reasonably cause a slowdown of factor 10 or so.

    Quote Originally Posted by pwyll View Post
    With the setup you are planning on getting I would recommend a card with 2Gb.
    I am already hit by slow 2D desktop performance, not even considering 3D.
    For 2D one screen takes 4 bytes (RGBA) * (2560 + 1200) * 1600 = 24 MB.
    A 8800 GT with 512 MB RAM should be just fine to handle this and still have room for back buffers etc. Under Windows 7 or Linux with UNROTATED displays, it definitely is.

    That's why I asked in the AMD section of the forum: does a setup like mine work good in 2D (3D/compiz would be nice to have) on AMD? As I may add my 3rd TFT to this display group AMD is also my first option compared to adding a 2nd NVidia card.

    Frank

  8. #8
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    concerning wine and multimonitor setups.
    is there ANY way to efficiently lock the mouse cursor into the application window?
    games like warcraft 3 are especially problematic since its almost impossible to scroll on the borders of the window.
    i wrote a really hackish workarround for this, that resets the cursor into the window every few milliseconds but its not really satisfying.
    (sorry for hijacking this thread)

  9. #9
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    Quote Originally Posted by frank View Post
    Nvidia can, my setup is 2560x1440 landscape plus 1200x1600 portrait on a 8800 GT.
    I'm running a setup very similar to yours: I have a rotated 20" 1200x1600 monitor on the left and a non-rotated 30" 2560x1600 to the right.

    Works fine BUT:

    This setup is dog slow (compared to NOT running a monitor in portrait mode or Windows 7). It seems like rendering on the 90 rotated screen is completely un-accelerated.
    Seeing it's not possible to get a single monitor rotated using Twinview I'm assuming you went the Xinerama route. Correct? The performance of Xinerama is as you point out terrible and it wasn't acceptable for me. What I did is switch to the open source Nouveau drivers; these support single monitor rotating just fine (using xrandr) and will support Compiz and the like too. Even most games should work (see: http://www.phoronix.com/scan.php?pag...a_nouveau_q111).


    I am already hit by slow 2D desktop performance, not even considering 3D.
    For 2D one screen takes 4 bytes (RGBA) * (2560 + 1200) * 1600 = 24 MB.
    A 8800 GT with 512 MB RAM should be just fine to handle this and still have room for back buffers etc.
    FWIW, I'm using this setup with a 7600GS which has 256MB and it works fine. (Kernel 2.6.36, Mesa 7.9, libdrm 2.4.22).

    Quote Originally Posted by pwyll View Post
    With multiple monitors, the width of the desktop is the sum of the widths of the various monitor resolutions while the height is the largest height among your various monitors resolution.
    This is a bit nitpicking but the above is not correct if you have one monitor placed higher than the other (e.g. above each other). A better way of putting it: "the largest square that will fit all your monitors".

    In most cases, rotating one monitor to portrait causes the desktop size to increase.
    This increase in desktop size is what leads to the slow down that you experienced.
    This is not what's causing the decrease in performance in this case. The problem is the closed source nVidia drivers do not support rotating a single monitor and therefore if you still want to you have to resort to Xinerama, which is really slow.

    @frank, if you need any help getting this setup using Nouveau I'd be happy to assist.

  10. #10
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    I moved my dual monitor setup from a Nvidia 9500GT to an Ati 4850. Both monitors are 1920x1080, first monitor is rotated into portrait mode. Impressions:

    Positive (Ati):
    - acceleration (2d and 3d) works correctly
    - compiz works
    - video works
    - audio works
    - setup was trivial through amdcccle (catalyst) or the relevant ubuntu utility (radeon).
    - excellent support for custom video modes (catalyst), including 24p (which is great for video).

    Negative (Ati):
    - vsync doesn't work with fglrx at all. This is a known Ati issue, and is expected to be fixed in the 11.1 drivers.
    - vsync doesn't work on rotated monitors with radeon. This is a known driver issue.
    - the desktop expands to a single huge rectangle, meaning the mouse can move outside the visible area. This is a known X server issue and is expected to be fixed in an upcoming release.

    Positive (nvidia):
    - Xv uses PC color range (0-255) rather than TV range (15-229).

    Negative (nvidia):
    - rotation requires Xinerama, which disables hardware and video acceleration.
    - vsync doesn't work on rotated monitors at all. This is a known driver issue.
    - the open source drivers (nouveau) would become unstable with rotated monitors.

    Negative (both):
    - one monitor will always have incorrect subpixel antialiasing. This is a fontconfig/freetype/xft/whatever issue, because they fail to switch subpixel direction in accord to monitor rotation.

    All in all, I'm pretty happy with this setup. Ati works better than Nvidia here, as Nvidia requires Xinerama which sucks.

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