Bug report

In tag 2.0.1 the NavigationToolbar2QT includes an unchecked call to a Qt5 feature:

pm.setDevicePixelRatio(self.canvas._dpi_ratio)

https://github.com/matplotlib/matplotlib/blob/v2.0.1/lib/matplotlib/backends/backend_qt5.py#L587-L592

This is strange, b/c it's not there in tag 2.0.0 and it's not there in master!

I can reproduce this with a simple plt.plot(np.random.randn(10)).

AttributeError: 'PySide.QtGui.QPixmap' object has no attribute 'setDevicePixelRatio'

Issue goes away when I revert to 2.0.0