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I have an old PC that I use for testing purposes - an Athlon XP without SSE2 - that runs KDE4 slow, but otherwise just fine. So with the current removal of KDE4 packages I've tried to upgrade it to KDE5, without success.
The journal messages tell me that this is because the processor doesn't support SSE2. However, I've done some searching and found that this is supposedly a fixed issue - qt5, which causes the problems, is compiled with "-no-sse2" as an arch package. It appears that the libqml with JIT support uses assembler code with explicit SSE2 assertions, so my question is, how do I disable JIT for QT5 on this machine? Or is there any other workaround to allow KDE5 to run on an Athlon XP?
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Is it really KDE that complains about sse2 or is it SDDM? You can use any other display manager
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That was my first thought, too, so I tried lightdm. That way, plasma5 tries to start, but fails with the same error messages in the log:
Dez 12 15:59:50 queeg ksplashqml[1251]: This program requires an X86 processor that supports SSE2 extension, at least a Pentium 4 or newer
Dez 12 16:00:21 queeg kwin_x11[1356]: This program requires an X86 processor that supports SSE2 extension, at least a Pentium 4 or newer
Dez 12 16:00:23 queeg krunner[1358]: This program requires an X86 processor that supports SSE2 extension, at least a Pentium 4 or newer
Dez 12 16:00:30 queeg krunner[1390]: This program requires an X86 processor that supports SSE2 extension, at least a Pentium 4 or newerPlasma also displays several pages of error dump but I guess it all comes down to the SSE2 issue.
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