If disabling autobrightness fixed it per comment #6 there is some chance its related to a defective sensor. Did you re-enable autobrightness and is that how the issue recurred?
FWIW I do not see anything unusual in the last syslog -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1582337 Title: sudden black screen To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1582337/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
