Today I retested it with a new HDMI cable, but it still didn't work. However, I again installed an update, after which the monitor did come back alive. I have been unable to reproduce the problem ever since. Perhaps, after all, there were other factors in play, but I have no clue as to the root cause.
The update that *might* have fixed the problem: Start-Date: 2018-03-15 16:13:21 Commandline: apt upgrade Requested-By: brecht (1000) Upgrade: libcurl3:amd64 (7.55.1-1ubuntu2.3, 7.55.1-1ubuntu2.4), grub-common:amd64 (2.02~beta3-4ubuntu7.2, 2.02~beta3-4ubuntu7.3), grub2-common:amd64 (2.02~beta3-4ubuntu7.2, 2.02~beta3-4ubuntu7.3), isc-dhcp-common:amd64 (4.3.5-3ubuntu2.2, 4.3.5-3ubuntu2.3), qml-module-org-kde-solid:amd64 (5.43.0-0ubuntu1~ubuntu17.10~ppa1, 5.43.0-0ubuntu2~ubuntu17.10~ppa1), grub-efi-amd64-bin:amd64 (2.02~beta3-4ubuntu7.2, 2.02~beta3-4ubuntu7.3), firefox-trunk:amd64 (60.0~a1~hg20180311r407525-0ubuntu0.17.10.1~umd1, 61.0~a1~hg20180314r408098-0ubuntu0.17.10.1~umd1), libkf5solid5-data:amd64 (5.43.0-0ubuntu1~ubuntu17.10~ppa1, 5.43.0-0ubuntu2~ubuntu17.10~ppa1), grub-efi-amd64:amd64 (2.02~beta3-4ubuntu7.2, 2.02~beta3-4ubuntu7.3), grub-efi-amd64-signed:amd64 (1.85.2+2.02~beta3-4ubuntu7.2, 1.85.3+2.02~beta3-4ubuntu7.3), libkf5solid5:amd64 (5.43.0-0ubuntu1~ubuntu17.10~ppa1, 5.43.0-0ubuntu2~ubuntu17.10~ppa1), curl:amd64 (7.55.1-1ubuntu2.3, 7.55.1-1ubuntu2.4), isc-dhcp-client:amd64 (4.3.5-3ubuntu2.2, 4.3.5-3ubuntu2.3), libcurl3-gnutls:amd64 (7.55.1-1ubuntu2.3, 7.55.1-1ubuntu2.4) End-Date: 2018-03-15 16:13:35 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1755899 Title: Upgrade to linux 4.13.0-37-generic broke HDMI monitor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1755899/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
