Testing 18.04: can't log in after closing laptop lid

[Willem Hobers]

Hi all,

Using 18.04 on  a Lenovo laptop.

I've set the system to turn off the screen when I close the laptop lid.
If I then open the laptop again I am presented with the log in screen.
When I log in, I am -after some toing en froing- again presented with the
login screen.
When I log in for the second time I am presented with a black screen and
there is nothing I can do but to turn the laptop off, and then to reboot.

How do I investigate this issue? Which logs should I have a look at? Where
to report this?

Please advise,

Willem

Linux Xubuntu-18-04 4.15.0-13-generic #14-Ubuntu SMP Sat Mar 17 13:44:27
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

    description: Notebook
    product: 80UD (LENOVO_MT_80UD_BU_idea_FM_Lenovo ideapad 110-15ISK)
    vendor: LENOVO
    version: Lenovo ideapad 110-15ISK
    serial: MP16LZHW
    width: 64 bits
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