Hi, after computer change, matplotlib don't work dynamically.
Before, it was able to update the figure at each iteration of a loop. Today only the last data are plotted.
Configuration :
HP zBook 15 G3 with NVidia Quadro

###Bug report

Bug summary

A figure inside a loop are not updated at each step

Code for reproduction

import matplotlib.pyplot as plt
import numpy as np

x = np.arange(128)
plt.figure(1)
plt.ion()
plt.hold(False)
for it in range(5):
    plt.plot(x, x+it)
    plt.draw()

plt.ioff()
plt.show()

Expected outcome

• I expect to see one plot at each step of the for loop

Matplotlib version
1.5.1

Python version
3.5.2

OS
Ubuntu 16.04 LTS

• All of them had been installed from Ubuntu repository using synaptic