This schouldn't happen. lightdm should only be started about 10 times,
then disabled.
BTW: no errors are readable on screen. Logs only show lightdm restarted
by systemd after terminatating. Errors can be seen by disabling lightdm,
then starting it from commandline. But this isn't helpful either: "
This bug exists since 16.10 – we are at 18.10 now it is now two years
with this monitor killing bug.
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https://bugs.launchpad.net/bugs/1801533
Title:
lightdm
Same problem: it does not matter if upgraded from 18.04 or installed new
with 18.10. lightdm might not allways be capable initializing graphics
leeding to some loop together with systemd turning on backlight, turning
it off again, then restarting.
Backlight is turned on, then off about twice a sec
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