Everything worked fine until yesterday :) I use a mini-DP to connect to my screen for over a year now. Now, when I connect the cable it recognizes it (so I see the Ubuntu background in the screen and can work in my laptop) but when I close the lid or set the monitor as the main screen (so as to work only from the monitor screen as I have been doing), the whole system freezes. Removing the cable does nothing. Only hard reboot (pressing continuously the power button) brings it up.

Kernel: 4.15.0-44-generic, on 18.04.1 LTS (Bionic).

I cannot get anything from dmesg because of the freeze, but some errors from /var/log/syslog that maybe can help:

kernel: [  495.245250] ACPI Error: Method parse/execution failed \_GPE.XTBT, AE_ALREADY_EXISTS (20170831/psparse-550)
kernel: [  495.308520] pci 0000:03:00.0: BAR 13: failed to assign [io  size 0x2000]
gsd-color[1425]: no xrandr-Dell Inc.-DELL U2417H-5K9YD7AE224L device found: Failed to find output xrandr-Dell Inc.-DELL U2417H-5K9YD7AE224L
/usr/lib/gdm3/gdm-x-session[1974]: Errors from xkbcomp are not fatal to the X server
systemd-udevd[4191]: Process '/usr/sbin/alsactl -E HOME=/run/alsa restore 1' failed with exit code 99.
gnome-shell[1216]: Failed to apply DRM plane transform 0: Permission denied
gnome-shell[1216]: Failed to read EDID from 'eDP-1': No such file or directory
gnome-shell[1216]: message repeated 3 times: [ Failed to read EDID from 'eDP-1': No such file or directory]
gsd-color[1425]: failed to set screen _ICC_PROFILE: Failed to open file â<80><9c>/home/john/.local/share/icc/edid-18e261c7e650a8a483510701873ac4e2.iccâ<80><9d>: Permission denied

Anyone else with the same problem? What do I have to do if this is a general issue to let Ubuntu developers know about it?


So, the issue is in the 4.15.0-44-generic kernel and has been solved in the 4.15.0-45-generic. To manually update, run:

sudo apt-get update
sudo apt-get upgrade
sudo apt-get dist-upgrade

And that fixes it.

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