https://bugs.kde.org/show_bug.cgi?id=374422

            Bug ID: 374422
           Summary: kwin for i386 crashes on non SSE2 machines
           Product: kwin
           Version: 5.7.5
          Platform: Kubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: crash
          Priority: NOR
         Component: general
          Assignee: kwin-bugs-n...@kde.org
          Reporter: lbisch...@gmx.de
  Target Milestone: ---

Using the 32 bit ISO-image of Kubuntu 16.04 or 16.10, kwin crashes during boot
on the following machine:
AMD Athlon XP 3000+ CPU
VIA KT400 Chipset
Mainboard MSI KT4V-L
Gfx: nVidia Geforce 7600 GT (AGP8x card: XFX GF 7600 GT 560M 256MB)

I assume this is due the the missing SSE2 support of the Athlon CPU.
Is kwin supposed to require SSE2?

Booting works fine until the plasma background image is appearing.
Also the selection window whether you want to "try" or "install" Kubuntu shows
up, but only without window frame. At about the same time I get a crash
notification that kwin has crashed.
If I click on "restart" in the crash notification, then after some trials
another window (without frame) says: "KWin is unstable. It seems to have
crashed several times in a row." and suggests to select another window manager.

See also:
https://bugs.launchpad.net/ubuntu/+source/kwin/+bug/1614308

Maybe this is linked to
https://bugs.kde.org/show_bug.cgi?id=346244

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