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Canonical Starts Work On Mir Multi-Monitor Handling

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  • #11
    Originally posted by mrugiero View Post
    I'm wondering something that is not really important, but makes me curious.
    When dragging an app to the edge of a given monitor, to another, will it "jump" to the other screen, or will it display partially in both screens? This seems 100% trivial, but I can see how in a slower card this could lead to images showing a lack of sync (a screen will probably update before the other, and then one will have the previous state of the app displaying instead of the current state, for a fraction of second, while the other is already up-to-date). Just jumping would avoid this kind of artifact.

    EDIT: I'm asking more in general, not specifically Mir's case.
    Typically it splits between both screens, much in the same way as if you to do the 3D cube in compiz and you put a window in between 2 workspaces. Generally the sync issues aren't that noticeable, especially if both of your screens are different sizes/resolutions.

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    • #12
      Originally posted by AJenbo View Post
      The only down side I see is print screen would have to stitch together the frame bufferers in to a single image.
      I would say anything that makes common tasks easier to the same extent it makes uncommon tasks harder is a win. In this case it makes common tasks easier to more of an extent than it makes uncommon tasks harder (and that is ignoring people who only want a screenshot of one screen).

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      • #13
        Originally posted by schmidtbag View Post
        Multi-monitor setups are, IMO, only good if you have a low-wattage GPU with non-gaming purposes in mind, or, if you have a rig strictly used for gaming and nothing else. I have 2 HD5750s in crossfire and I was amazed how much heat the primary GPU generated when not doing anything graphically intensive. In this particular GPU anyway, it has 7 different clock settings in it's BIOS. I tried underclocking the settings that seemed to be linked specifically to multi-monitors and surprisingly, just a 100mhz difference in the memory can make the 2nd display unstable. Windows didn't seem to care as much about re-clocking. I'm guessing if I want to try multi-monitor again, I'm going to have to either ditch KDE for something not composited, or, hope that mir or wayland will allow me to reclock my GPU. Considering the relationship between KDE and mir, that reduces my options.
        Get an NVIDIA card.

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        • #14
          Originally posted by johnc View Post
          Get an NVIDIA card.
          I'm 90% sure nvidia suffers from the same problem. Any GPU will need to clock itself higher to drive more displays.

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          • #15
            Originally posted by schmidtbag View Post
            I'm 90% sure nvidia suffers from the same problem. Any GPU will need to clock itself higher to drive more displays.
            I have two displays running on the Unity desktop and my GTX 570 downclocks to 50/135/101 MHz graphics / memory / processor clocks. Maybe it's different for a CF / SLI setup though.

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            • #16
              Originally posted by johnc View Post
              I have two displays running on the Unity desktop and my GTX 570 downclocks to 50/135/101 MHz graphics / memory / processor clocks. Maybe it's different for a CF / SLI setup though.
              as mentioned i get the same bad result with GT210 as HD5xxx, so Nvidia isn't a magic bullet. At home though with, smaller monitors, things works grate on my GTX460se. My laptop with HD6370m also works grate with two monitors.

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              • #17
                Originally posted by AJenbo View Post
                as mentioned i get the same bad result with GT210 as HD5xxx, so Nvidia isn't a magic bullet. At home though with, smaller monitors, things works grate on my GTX460se. My laptop with HD6370m also works grate with two monitors.
                I get good performance with two monitors on a GT210 but that is with GNOME2 + compiz. I can't speak to the newer compositors.

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                • #18
                  Originally posted by johnc View Post
                  I get good performance with two monitors on a GT210 but that is with GNOME2 + compiz. I can't speak to the newer compositors.
                  The one where i get poor performance is about 3kx2k resolution, don't know if that has any thing to say.

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                  • #19
                    Originally posted by AJenbo View Post
                    The one where i get poor performance is about 3kx2k resolution, don't know if that has any thing to say.
                    Interesting. I'm using a pair of 1080p monitors. What DE are you using?

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                    • #20
                      Incoherency

                      Originally posted by dh04000
                      I hope to see this done well. I haven't had a positive multi-desktop experience in linux on any of the DE's on any distros.
                      Originally posted by Ericg View Post
                      Thats X's fault. Granted libkscreen aims to fix that. Give KDE 4.11 a try when it comes out, or the latest release of Fedora KDE (they shipped it ahead of time)
                      Ericg your message is self-contradictory: if it is X fault, how KDE can fix it as it is still running on X?

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