Comment # 11 on bug 1094733 from Felipe Abrahao

(In reply to Fabian Vogt from comment #8)
> xf86-video-intel should not be used, so uninstall that again.
> 
> That it works with LIBGL_ALWAYS_SOFTWARE=1 means it's a bug in the graphics
> stack and unlikely Plasma itself, so reassigning.
> 
> Can you provide a backtrace for the software rendering crash?

-- Test "LIBGL_ALWAYS_SOFTWARE=1 plasmashell"

Plasmashell crashed and, then, kwin_x11 crashed and after a while plasmashell
was back again automatically. 

I'm attaching the "gdb -p 'plasmashell'" file until the plasmashell brief crash
and kwin_x11 crash.

I'm also attaching "gdb kwin_x11" file that I had use to restart kwin_x11 after
the crash.

-- Reproducibility:

I have now pretty confidence after several tests that the issue only happens on
my laptop running on battery. Thus, I'm attaching my tlp config file.

The issue doesn't happen on Tumbleweed (Plasma 5.12, Qt 5.10, Kernel 4.15) and
on Leap 42.3 (default) on the same laptop.