I'd put my bet on the JDK AWT VRAM handling, so when I suggested upgrade JDK, I meant upgrading it to a more recent version than 1.8. I'd Try JDK 11 first, if that's still do not work I'd test more recent ones...

On 5/6/21 8:02 AM, Geertjan Wielenga wrote:
Maybe Swing-specific, so try reproduce with another Swing app or create a new small Swing app yourself to reproduce the problem.

Gj

On Thu, 6 May 2021 at 16:55, bruehlicke <bruehli...@gmail.com <mailto:bruehli...@gmail.com>> wrote:

    Thanx. Tried 1.8u202 (latest I can use without commercial license)
    and it happened as well after a while. Hmm ... currently only on
    Alienware laptop.  ... wicket. Anyhow here running NetBeans on a
    Gaming laptop having trouble  ?  It looks like a generic problem
    and hence just running NetBeans should cause the same issue.

    Anyhow, thank you for your suggestion
    Bernd

    On Wed, May 5, 2021 at 10:04 AM Laszlo Kishalmi
    <laszlo.kisha...@gmail.com <mailto:laszlo.kisha...@gmail.com>> wrote:

        Try to upgrade your JDK


        On 5/5/21 7:53 AM, bruehlicke wrote:
        > We have a mature NetBeans 8.2 app with Java 1.8u112 running
        on Win 10
        > without any problems. Now we got an Alienware and from time
        to time
        > the app becomes unusable as the different windows within the
        app are
        > moving randomly around when fx just moving the mouse. I do
        not want to
        > use the work "flickering" as that is not describing it
        correctly. It
        > is like the old mouse droppings we have seen, just on the
        entire
        > windows on the app.
        >
        > We have tried
        > 1) To turn off the Nvidea card and use the interval Intel
        graphic
        > after which it worked for a while but came back
        > 2) Vica versa turning off Intel  same result.
        > 3) Reboot usually naked it work for a while
        > 4) It happens on both internal and external monitors.
        >
        > I know, it sounds like Sci-Fi. Just wanted to see if anyone
        out there
        > has had a similar issue and maybe even found a work-around.
        >
        > Until now we have only seen this on Alienware machines. So
        it MIGHT be
        > a SciFi effect ;-)
        >
        > Bests
        > Bernd
        >

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