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After doing a full system upgrade, I'm stuck on a black screen when booting.
Switching to another tty and running
systemctl list-units --failed
I see that lightdm is the only unit that has failed. Running
journalctl -b --unit
I get the following output:
Service hold-off time over, scheduling restart.
lightdm.service: Stopped Light Display Manager.
Starting Light Display Manager...
Started Light Display Manager.
lightdm.service: Main process exited, code=exited, status=1/FAILURE
lightdm.service: Failed with result 'exit-code'
lightdm.service: Service hold-off time over, scheduling restart.
lightdm.service: Scheduled restart job, restart counter is at 5
Stopped Light Display Manager.
lightdm.service: Start request repeated too quickly.
lightdm.service: failed with 'exit-code'.
Failed to start Light Display Manager
Last edited by lightdm.failure (2018-06-25 14:50:29)
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Welcome to the arch linux forums lightdm.failure. Please provide the pacman.log from the update which will contain all the packages changed during the update.
Please also provide the contents of /var/log/lightdm/lightdm.log and /var/log/Xorg.0.log.
Last edited by loqs (2018-06-24 18:08:03)
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Please post the output of `systemctl status lightdm.service`. Also, details about your graphics setup should help; please provide the outputs of `lspci`, `dmesg` and any kernel parameters you are booting with. On a side-note, to isolate the issue, have you tried starting X (assuming you're not on Wayland) without a graphical login manager, e.g., via startx?
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And also provide the output from the troubleshooting steps in the wiki...
https://wiki.archlinux.org/index.php/Sy … leshooting
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Slithery you are certain lightdm.service provides more than the following in the journal?
lightdm.service: Main process exited, code=exited, status=1/FAILURE
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Happened in my laptop too when using xfce4/mate with nvidia drivers, i had to use generic drivers or gnome DE
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For future readers I FIXED this by removing the nvidia dkms package:
sudo pacman -Rs nvidia-390xx-dkms
the dkms is a support that handles the modules that generally reside outside the kernel source tree to be automatically rebuild when the kernel is upgraded. You will not die without the dkms.
Then reinstall your graphics driver:
sudo pacman -S nvidia-390xx
and
reboot
NOTE be sure to install your own driver version.
Last edited by lightdm.failure (2018-06-25 14:51:37)
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I have the same issue but I could always to switch to another terminal (ctrl+alt+f2) and restart lightdm.service. So I increased the interval in systemd between restarts of this service in /usr/lib/systemd/system/lightdm.service. I added these 2 lines under [Service] section:
RestartSec=1
StartLimitBurst=50
Last edited by kayn (2021-05-09 19:38:20)
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https://wiki.archlinux.org/index.php/Ke … _KMS_start or https://wiki.archlinux.org/title/LightD … TTY_output
Also please don't necrobump and esp. not solved threads.
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