Comment 5 for bug 1575148

More issues related to this:

1. Once every few minutes the screen flickers.

2. Upon resume from sleep, more often than not the laptop screen is black: not working. Switching to a tty and back to control+alt+F7 sometimes makes the screen work again. What works always, though, is to plug in an external monitor which shows the desktop background overlaid with a grid of dots indicative of the password screen, type in the password blindly (fortunately the focus is by default on the password input field, which is in the blackened laptop screen), and then move the mouse into the other display, go to top-right and push the system menu icon to then select the System Settings, go to Display, choose "Mirror", and then the laptop screen works again. Of course, this workaround is not always feasible, given that one does not carries a second monitor around.