The screen stays dark after I reopen the lid

Question

I have an e-machines E727 laptop and lubuntu 16.04. I disabled all kind of automatic screen locking and I set it not to suspend when I close the lid. When I close the lid and reopen, I would expect the screen to be back on. However, the screen stays dark. I have to press Ctrl+Alt+F2 and then Ctrl+Alt+F7 to see anything again. Is there a way to fix this?

I tried all of these, without success:

• Black screen after i close the lid and reopen
• https://bytefreaks.net/gnulinux/lubuntu-do-nothing-when-i-close-the-laptops-lid
• https://bytefreaks.net/gnulinux/lubuntu-do-nothing-when-i-close-the-laptops-lid
• Laptop screen stays blank after lid is reopened