I'm closing this for now until I know more.
1.18.2 did not help with this, but instead I tried a daily build live
session and there the rendering was fine. So it looks like something
went wrong in the upgrade from trusty.
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1558978
Title:
Black rendering of Qt Desktop and window components
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