broken OpenGL support in rv370/rv380? (crashes Plasmashell5)

[Felix Miata]

$SUBJECT was suggested in fedora mailing list thread:
https://lists.fedoraproject.org/pipermail/kde/2015-August/015633.html

Respondent suggested workaround/test to do unconditionally:

	QT_XCB_FORCE_SOFTWARE_OPENGL=1
	export QT_XCB_FORCE_SOFTWARE_OPENGL

That avoids the corruption and crashing that happens in Plasma but not IceWM.

Could he be right? I looked for an already filed mesa bug in
bugs.freedesktop.org and found nothing similar.
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