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List:       openjdk-openjfx-dev
Subject:    Re: linux separate screen configuration issue
From:       sebastien deries <sebastien.deries () gmail ! com>
Date:       2018-05-23 6:44:44
Message-ID: CAEdf35kMsZhsq4XbJZFnS80pii1ODgKskY_wT11jYOO=AM=jBg () mail ! gmail ! com
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Greetings,
Am I really the only one getting this issue ?
https://stackoverflow.com/questions/50168857/javafx-misreports-number-of-screen-devices

Thanks.

Sebastien



On Fri, Apr 27, 2018 at 3:33 PM, sebastien deries <
sebastien.deries@gmail.com> wrote:

> Greetings,
>
> I develop an application on linux  on a Red Hat 6.8 x64 using java 8u162
> and an NVidia GPU (and its latest driver), with 2 full HD Screens.
>
> I got an issue retrieving the number of physical screens:
>
>    - when the X server is in extended desktop mode (2 physical screens,
>    but a single logical one from 0 to 3840 pixels), Screen.getScreens()
>    returns 2 Screen (which is normal)
>    - When the X server is in separate desktop mode (2 physical screens
>    and 2 logical screens from 0 to 1920 pixels), Screen.getScreens() returns 1
>    Screen ==>  is this normal or a bug?
>
> I compared the JavaFX API to the AWT API:
>
> GraphicsEnvironment env = GraphicsEnvironment.
> getLocalGraphicsEnvironment();
> GraphicsDevice[] gdev = env.getScreenDevices();
>
> AWT returns 2 screen devices in both configuration mode.
>
>
> I Also checked on java 9 and java 10 using a ubuntu x64 machine and got
> the same issue with JavaFX.
>
> I tried debugging this and it seems that the issue is in libglass.so in
> native code.
>
> What do you think about this ?
>
> Thank you for your help.
>
> Regards
>
> Sebastien
>
>
> Here is the code that reproduces the issue:
>
> public class ScreenTest extends Application {
>
>     private static final int SIZE = 1600;
>     private final AnchorPane root = new AnchorPane();
>
>     @Override
>     public void start(Stage primaryStage) throws Exception {
>
>         root.backgroundProperty().set(new Background(new
> BackgroundFill(Color.BEIGE, null, null)));
>         Scene scene = new Scene(root, SIZE, SIZE);
>         primaryStage.show();
>
>         Screen.getScreens().forEach(screen -> System.out.println("JAVAFX
> :" + screen));
>         GraphicsEnvironment env = GraphicsEnvironment.
> getLocalGraphicsEnvironment();
>         GraphicsDevice[] gdev = env.getScreenDevices();
>
>         for (GraphicsDevice d : gdev) {
>             System.out.println("AWT:" + d);
>         }
>     }
>     public static void main(String... strings) {
>         launch(strings);
>     }
> }
>
>
>
> here is the X11  Xorg.conf:
>
> Section "ServerLayout"
>     Identifier     "Layout0"
>     Screen      0  "Screen0" 0 0
>     Screen      1  "Screen1" RightOf "Screen0"
>     InputDevice    "Keyboard0" "CoreKeyboard"
>     InputDevice    "Mouse0" "CorePointer"
>     Option         "Xinerama" "0"
> EndSection
>
> Section "Files"
> EndSection
>
> Section "InputDevice"
>
>     # generated from default
>     Identifier     "Mouse0"
>     Driver         "mouse"
>     Option         "Protocol" "auto"
>     Option         "Device" "/dev/psaux"
>     Option         "Emulate3Buttons" "no"
>     Option         "ZAxisMapping" "4 5"
> EndSection
>
> Section "InputDevice"
>
>     # generated from default
>     Identifier     "Keyboard0"
>     Driver         "kbd"
> EndSection
>
> Section "Monitor"
>     Identifier     "Monitor0"
>     VendorName     "Unknown"
>     ModelName      "CMN"
>     HorizSync       53.0 - 66.0
>     VertRefresh     48.0 - 60.0
>     Option         "DPMS"
> EndSection
>
> Section "Monitor"
>     Identifier     "Monitor1"
>     VendorName     "Unknown"
>     ModelName      "DELL C7017T"
>     HorizSync       30.0 - 83.0
>     VertRefresh     56.0 - 76.0
> EndSection
>
> Section "Device"
>     Identifier     "Device0"
>     Driver         "nvidia"
>     VendorName     "NVIDIA Corporation"
>     BoardName      "Quadro K3100M"
>     BusID          "PCI:1:0:0"
>     Screen          0
> EndSection
>
> Section "Device"
>     Identifier     "Device1"
>     Driver         "nvidia"
>     VendorName     "NVIDIA Corporation"
>     BoardName      "Quadro K3100M"
>     BusID          "PCI:1:0:0"
>     Screen          1
> EndSection
>
>
>
>
>
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