Thanks for the bug report. Please:
1. Clarify if you mean "turn on" or waking from sleep.
2. Clarify if you mean "login screen" instead of "lock screen".
3. Run this command to collect more system information:
apport-collect 2161407
** Package changed: gdm3 (Ubuntu) => gnome-shell (Ubuntu)
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/2161407
Title:
black screan after 10 seconds when i turn on my laptop
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