as suggested by Takashi Iwai of alsa-project.org, I opened a bug report at https://bugs.freedesktop.org/show_bug.cgi?id=90785
** Bug watch added: freedesktop.org Bugzilla #90785 https://bugs.freedesktop.org/show_bug.cgi?id=90785 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1458136 Title: [MS-7823, Realtek ALC892, Green SPDIF Out, Rear] No sound at all snd_hda_intel Cannot turn on display power on i915 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1458136/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs