Display manager thinks I have a proprietary driver installed when I don't and then crashes

Binary package hint: kde-guidance

$ sudo displayconfig
Traceback (most recent call last):
  File "/usr/bin/displayconfig", line 1720, in <module>
    displayapp = DisplayApp()
  File "/usr/bin/displayconfig", line 448, in __init__
    self._buildGUI()
  File "/usr/bin/displayconfig", line 664, in _buildGUI
    w = GfxCardWidget(vbox,self.xsetup, gfxcard, self.gfxcarddialog, self.monitordialog)
  File "/usr/share/python-support/kde-guidance/displayconfigwidgets.py", line 640, in __init__
    self._syncGUI()
  File "/usr/share/python-support/kde-guidance/displayconfigwidgets.py", line 741, in _syncGUI
    self.driverlabel.setText(self.gfxcard.getGfxCardModel().getProprietaryDriver())
TypeError: argument 1 of QLabel.setText() has an invalid type

apport dies slightly after this, so there is no apport crash report (see Bug 198183).

Up until this weekend it worked find. If I change line 741 from (self.gfxcard.getGfxCardModel().getProprietaryDriver()) to (self.gfxcard.getGfxCardModel().getDriver()) displayconfig works just fine, so the problem appears to that somehow it thinks this comptuer has a proprietary driver when it doesn't.

I went to restricted manager to confirm no restricted drivers needed. This an an ancient ATI Rage Pro 128 card.